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Selection for easier managed sheep

Published online by Cambridge University Press:  01 January 2023

J Conington ,
J Collins  and
C Dwyer
J Conington*
Affiliation:
Sustainable Livestock Systems, Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG, UK
J Collins
Affiliation:
Sustainable Livestock Systems, Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG, UK
C Dwyer
Affiliation:
Sustainable Livestock Systems, Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG, UK
*
* Contact for correspondence and requests for reprints: [email protected]
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Abstract

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Current alterations in the farm environment, such as a reduced number of farm workers, may mean that sheep genotypes that are highly dependent on man for nutritional and reproductive success will experience poorer welfare within that environment. In the past 30 years, average flock size has doubled, and flocks of over 1,000 ewes managed by one stockperson are common. The reduction in the ratio of stockpeople to sheep affects animal welfare, with less time for tasks such as healthcare and inspection. It has also led to increased interest in the development of new genotypes that are better able to look after themselves. Selection and management of sheep to promote behaviours associated with survival, and selection of robust animals that require less human intervention for good welfare, are important breeding goals. As these animals will receive less inspection at close quarters, selection for resistance to disease will have significant animal welfare benefits. In addition, the development of sheep lines that require little or no intervention at lambing will be important. In areas where wool is not valuable, the use of wool-shedding breeds to avoid the stress associated with shearing, and to reduce the incidence of flystrike are already proving to be beneficial. Importantly, this selection should not be interpreted as providing no care to these animals, and careful management during the production of these genotypes is needed to avoid at least transient welfare problems where genotypes and environment (eg lower shepherding) are mismatched.

Keywords

animal welfarebehaviourbreedingdisease resistancelow inputsheep
Type
Research Article
Information
Animal Welfare , Volume 19 , Issue S1: Proceedings of the UFAW International Symposium ‘Darwinian selection, selective breeding and the welfare of animals’ Bristol, 2009 , May 2010 , pp. 83 - 92
Copyright
© 2010 Universities Federation for Animal Welfare

References

Abbot, KA and Lewis, CJ 2005 Current approaches to the management of ovine footrot. Veterinary Journal 169: 28–41CrossRefGoogle Scholar
Alexander, G 1958 Behaviour of newly born lambs. Proceedings of the Australian Society of Animal Production 2: 123–125Google Scholar
Alexander, G 1988 What makes a good mother? Proceedings of the Australian Society for Animal Production 17: 25–41Google Scholar
Alexander, G, Poindron, P, Le Neindre, P, Stevens, D, Lévy, F and Bradley, L 1986 The importance of the first hour post partum for exclusive maternal bonding in sheep. Applied Animal Behaviour Science 16: 295–300CrossRefGoogle Scholar
Alexander, G, Stevens, D, Bradley, LR and Barwick, SA 1990b Maternal behaviour in Border Leicester, Glen Vale (Border Leicester derived) and Merino sheep. Australian Journal of Experimental Agriculture 30: 27–38CrossRefGoogle Scholar
Alexander, G, Stevens, D, Kilgour, R, de Langen, H, Mottershead, BE and Lynch, JJ 1983 Separation of ewes from twin lambs: incidence in several sheep breeds. Applied Animal Ethology 10: 301–317CrossRefGoogle Scholar
Alexander, G and Williams, D 1966 Teat-seeking activity in new-born lambs: the effects of cold. Journal of Agricultural Science 67: 181–189CrossRefGoogle Scholar
Alwan, M 1983 Studies of the flock mating performance of Booroola Merino crossbred ram lambs and the foot conditions in the Booroola Merino crossbreds and Perendale sheep grazed on hill country. Agricultural Science Thesis, Massey University, New ZealandGoogle Scholar
Anderson, N, Barger, IA and Waller, PJ 1987 Impact of gastrointestinal parasitism on pasture utilization by grazing sheep. In: Wheeler, JL, Pearson, CJ and Robards, GE (eds) Temperate Pastures: Their Production, Use and Management pp 555–566. Australian Wool Corp: Melbourne, AustraliaGoogle Scholar
Atkins, KD and McGuirk, BJ 1979 Selection of Merino sheep for resistance to fleece rot and body strike. Wool Technology and Sheep Breeding 27: 15–19Google Scholar
Baker, RL, Clark, JN, Harvey, TG and Meyer, HH 1986 Inheritance of foot and jaw abnormalities in sheep. Proceedings of the New Zealand Society of Animal Production 46: 93–100Google Scholar
Baker, RL, Watson, TG, Bisset, SA, Vlassoff, A and Douch, PGC 1991 Breeding sheep in New Zealand for resistance to internal parasites: research results and commercial application. In: Gray, GD and Woolaston, RR (eds) Breeding for Disease Resistant Sheep pp 19–32. Australian Wool Corp: Melbourne, AustraliaGoogle Scholar
Baldwin, BA and Shillito, EE 1974 The effect of ablation of the olfactory bulbs on parturition and maternal behaviour of Soay sheep. Animal Behaviour 22: 220–223CrossRefGoogle Scholar
Bellows, RA and Lammoglia, MA 2000 Effects of severity of dystocia on cold tolerance and serum concentrations of glucose and cortisol in neonatal beef calves. Theriogenology 53: 803–813Google ScholarPubMed
Bishop, SC, Bairden, K, McKellar, QA and Stear, MJ 1996 Genetic parameters for faecal egg count following mixed, natural predominantly Ostertagia circumcincta infection and relationships with live weight in young lambs. Animal Science 63: 423–428CrossRefGoogle Scholar
Bishop, SC, Jackson, F, Coop, RL and Stear, MJ 2004 Genetic parameters for resistance to nematode infections in Texel lambs. Animal Science 78: 185–194CrossRefGoogle Scholar
Cloete, SWP 1993 Observations on neonatal progress of Dormer and South African Mutton Merino lambs. South African Journal of Animal Science 23: 38–42Google Scholar
Cloete, SWP, Olivier, JJ and Scholtz, AJ 1998 Aspects of lambing and neonatal behaviour of duel-purpose sheep. Proceedings of the 6th World Congress on Genetics in Applied Livestock Production 27: 39–42Google Scholar
Cloete, SWP and Scholtz, AJ 1998 Lamb survival in relation to lambing and neonatal behaviour in medium wool Merino lines divergently selected for ewe multiple rearing ability. Australian Journal of Experimental Agriculture 38: 801–811CrossRefGoogle Scholar
Cloete, SWP, Scholtz, AJ, Gilmour, AR and Olivier, JJ 2002 Genetic and environmental effects on lambing and neonatal behaviour of Dormer and South African Mutton Merino lambs. Livestock Production Science 78: 183–193Google Scholar
Cloete, SWP, Van Wyk, JB, Scholtz, AJ and Gilmour, AR 2003 Genetic and environmental parameters for lambing behaviour in Merino lines divergently selected for ewe multiple rearing ability. Proceedings of the New Zealand Society of Animal Production 63: 169–172Google Scholar
Conington, J 1990 Premature wool loss in sheep. MSc Thesis, Aberdeen University, UKGoogle Scholar
Conington, J, Bishop, SC, Grundy, B, Waterhouse, A and Simm, G 2001 Multi-trait selection indexes for sustainable hill sheep production. Animal Science 73: 413–423CrossRefGoogle Scholar
Conington, J, Bishop, SC, Waterhouse, A and Simm, G 2004 A bio-economic approach to derive economic values for pasture-based sheep genetic improvement programmes. Journal of Animal Science 82: 1290–1304CrossRefGoogle Scholar
Conington, J, Bishop, SC, Lambe, N, Bunger, L and Simm, G 2006 Testing new selection indices for sustainable hill sheep production, lamb growth and carcass traits. Animal Science 82: 4: 445–453Google Scholar
Conington J, Hosie B, Nieuwhof, GJ, Bishop SC and Bünger L 2008a Breeding for resistance to footrot - the use of hoof scoring to quantify footrot in sheep. Veterinary Research Communications 14 May 2008. http://www.springerlink.com/content/r247784t523lm0I7/?p=c2eb24968ab8451eaf059d62197a2538&pi=0 doi: 10.1007/s11259-008-9062-x. ISSN=0165-7380 (Print) 1573-7446Google Scholar
Conington, J, Cao, GQ, Stott, A and Bünger, L 2008b Breeding for resistance to mastitis in United Kingdom sheep - a review and economic appraisal. Veterinary Record 162: 369–376CrossRefGoogle Scholar
Conington, J, Nicoll, L, Mitchell, S, Kempson, S and Bünger, L 2010a Evidence for genetic and nutritional influences on shelly hoof in sheep, submittedGoogle Scholar
Conington, J, Bishop, SC and Bünger, L 2010b Genetic parameters and environmental aspects of Footrot in UK Texel sheep, in preparationGoogle Scholar
Coombs, T and Dwyer, CM 2008 Effects of prenatal undernutrition in early gestation on the ewe-lamb bond and lamb behaviour in Suffolk and Scottish Blackface sheep. Proceedings of the 42nd International Congress of the International Society for Applied Ethology. 3-9 August 2008, Dublin, EireGoogle Scholar
Coop, RL 1982 The impact of subclinical parasitism in ruminants. In: Mettrick DF and Desser SS (eds) Parasites, Their World and Ours pp 439–450. Proceedings of the 5th International Congress of Parasitology. Toronto, CanadaGoogle Scholar
Cumlivski, B 1988 Resistance of sheep kept together of the breeds Kent (Romney Marsh), Lincoln, Cotswold and Leicester. Proceedings of the 3rd World Congress on Sheep and Beef Cattle Breeding 1: 643–645Google Scholar
D’Eath, RB, Conington, J, Lawrence, AB, Olsson, IAS and Sand⊘e, P 2010 Breeding for behavioural change in farm animals: practical and ethical considerations. Animal Welfare 19: S17–S27Google Scholar
Dunlop, AA and Hayman, RH 1958 Differences among Merino strains in resistance to fleece rot. Australian Journal of Agricultural Research 9: 260–266CrossRefGoogle Scholar
Dwyer, CM 2003 Behavioural development in the neonatal lamb: Effect of maternal and birth-related factors. Theriogenology 59: 1027–1050CrossRefGoogle ScholarPubMed
Dwyer, CM 2008 Genetic and physiological effects on maternal behavior and lamb survival. Journal of Animal Science 86: E246–258CrossRefGoogle Scholar
Dwyer, CM and Lawrence, AB 1998 Variability in the expression of maternal behaviour in primiparous sheep: effects of genotype and litter size. Applied Animal Behaviour Science 58: 311–330CrossRefGoogle Scholar
Dwyer, CM and Lawrence, AB 1999 Does the behaviour of the neonate influence the expression of maternal behaviour in sheep? Behaviour 136: 367–389Google Scholar
Dwyer, CM and Lawrence, AB 2000 Maternal behaviour in domestic sheep (Ovis aries): constancy and change with maternal experience. Behaviour 137: 1391–1413CrossRefGoogle Scholar
Dwyer, CM and Lawrence, AB 2005 A review of the behavioural and physiological adaptations of hill and lowland breeds of sheep that favour lamb survival. Applied Animal Behaviour Science 92: 235–260CrossRefGoogle Scholar
Dwyer, CM and Morgan, CA 2006 Maintenance of body temperature in the neonatal lamb: Effects of breed, birth weight and litter size. Journal of Animal Science 84: 1093–1101CrossRefGoogle ScholarPubMed
Dwyer, CM, Lawrence, AB and Bishop, SC 2001 Effects of selection for lean tissue content on maternal and neonatal lamb behaviours in Scottish Blackface sheep. Animal Science 72: 555–571CrossRefGoogle Scholar
Dwyer, CM, McLean, KA, Deans, LA, Chirnside, J, Calvert, SK and Lawrence, AB 1998 Vocalisations between mother and young in the sheep: effects of breed and maternal experience. Applied Animal Behavioural Science 58: 105–119CrossRefGoogle Scholar
Eales, FA and Small, J 1980 Determinants of heat production in newborn lambs. International Journal of Biometeorology 24: 157–166Google ScholarPubMed
Edwards, NM, Hebart, M and Hynd, PI 2009 Phenotypic and genetic analysis of a barebreech trait in Merino sheep as a potential replacement for surgical mulesing. Animal Production Science 49(1): 56–64CrossRefGoogle Scholar
Elving, L, Grommers, FJ and van Eldik, P 1986 Parturition difficulties and perinatal mortality in Texel and Milksheep. Proceedings of the Factors Affecting the Survival of Newborn Lambs, a seminar in the CEC Programme of Coordination of Agricultural Research pp 115–122. 22-23 January 1985, Brussels, BelgiumGoogle Scholar
Emery, DL, Stewart, DJ and Clark, BL 1984 The comparative susceptibility of five breeds of sheep to footrot. Australian Veterinary Journal 61: 85–88CrossRefGoogle Scholar
Everett-Hinks, JM, Blair, HT, Stafford, KJ and Lopez-Villalobos, N 2005 Effect of ewe maternal behaviour score on lamb survival and litter survival. Livestock production science 93: 51–61CrossRefGoogle Scholar
Fadelli, ME and Leroy, PL 2001 Estimation of additive and nonadditive genetic parameters for reproduction, growth and survival traits in crosses between Moroccan D'man and Timahdite sheep breeds. Journal of Animal Breeding and Genetics 18(5): 341–353CrossRefGoogle Scholar
Fahmy, MH, Robert, S and Castonguay, F 1997 Ewe and lamb behaviour at parturition in prolific and non-prolific sheep. Canadian Journal of Animal Science 77: 9–15CrossRefGoogle Scholar
Festa-Bianchet, M 1988 Nursing behaviour of bighorn sheep: correlates of ewe age, parasitism, lamb age, birthdate and sex. Animal Behaviour 36: 1445–1454CrossRefGoogle Scholar
Fogarty, NM, Hopkins, DL and van de Ven, R 2000 Lamb production from diverse genotypes 1. Lamb growth and survival and ewe performance. Animal Science 70: 135–145CrossRefGoogle Scholar
French, NP, Parkin, TDH and Morgan, KL 1996 A case control study of blowfly strike in lambs. Veterinary Record 139(16): 384–388CrossRefGoogle ScholarPubMed
French, NP, Wall, R and Morgan, KL 1995 The seasonal pattern of sheep blowfly strike in England and Wales. Medical & Veterinary Entomology 9(1): 1–8CrossRefGoogle ScholarPubMed
Gama, LT, Dickerson, GE, Young, LD and Leymaster, KA 1991 Effects of breed, heterosis, age of dam, litter size and birth weight on lamb mortality. Journal of Animal Science 69: 2727–2743CrossRefGoogle ScholarPubMed
Gilmour, AR and Raadsma, HW 1986 Estimating genetic variation and covariation for flystrike incidence in Australian Merino sheep on an underlying normal scale. In: Third World Congress on Genetics applied to Livestock Production pp 460–463. 16-22 July 1986, Lincoln, Nebraska, USAGoogle Scholar
Greef, JC and Karlsson, LJE 1997 Genetic relationships between faecal egg count and scouring in Merino sheep. Proceedings of the Association for the Advancement of Animal Breeding and Genetics 12: 333–337Google Scholar
Grogono-Thomas, R and Johnston, AM 1997 A Study of Ovine Lameness. MAFF Open Contract OC59 45K, Final Report. Defra: London, UKGoogle Scholar
Gruner, L, Cortet, J, Sauve, C, Limouzin, C and Brunel, JC 2002 Evolution of nematode community in grazing sheep selected for resistance and susceptibility to Teladorsagia circumcincta and Trichostrongylus colubriformis: a 4-year experiment. Veterinary Parasitology 109: 277–291CrossRefGoogle ScholarPubMed
Hall, DG, Fogarty, NM and Gilmour, AR 1995 Performance of crossbred progeny of Trangie fertility Merino and Booroola Merino rams and Poll Dorset ewes 1. Lamb birth weight, survival and growth. Australian Journal of Experimental Agriculture 35: 1069–1074CrossRefGoogle Scholar
Haughey, KG 1980 The effect of birth injury to the foetal nervous system on the survival and feeding behaviour of lambs. In: Wodzicka-Tomasczewska, M, Edey, TN and Lynch, JJ (eds) Reviews in Rural Science pp 109–111. University of New England: Armidale, AustraliaGoogle Scholar
Haughey, KG 1991 Perinatal lamb mortality, its investigation, causes and control. Journal of the South African Veterinary Association 62: 78–91CrossRefGoogle ScholarPubMed
Haughey, KG 1993 Perinatal lamb mortality — its investigation, causes and control. Irish Veterinary Journal 46: 9–28Google Scholar
Heringstad, B, Chang, YM, Gianola, D and Klemetsdal, G 2005 Genetic association between susceptibility to clinical mastitis and protein yield in Norwegian dairy cattle. Journal of Dairy Sciences 88: 1509–1514CrossRefGoogle ScholarPubMed
Hernandez, H, Serafin, N, Vazquez, H, Delgadillo, JA and Poindron, P 2001 Maternal selectivity suppression through peripheral anosmia affects neither overall nursing frequency and duration, nor lactation performance in ewes. Behavioural Processes 53: 203–209Google ScholarPubMed
Hickford, J 2000 Development of a Sustainable Method of Natural Footrot Control. Report to the NZ Meat Research and Development Council: Lincoln University, New ZealandGoogle Scholar
Hickford, JGH, Zhou, H, Slow, S and Fang, Q 2004 Diversity of the ovine DQA2 gene. Journal of Animal Sciences 82(6): 1553–1563Google ScholarPubMed
Hinch, GN, Kelly, RW, Owens, JL and Crosbie, SF 1983 Patterns of lamb survival in high fecundity Booroola flocks. Proceedings of the New Zealand Society of Animal Production 43: 29–32Google Scholar
Houston, DC and Maddox, JG 1974 Causes of mortality among young Scottish Blackface lambs. Veterinary Record 95: 575CrossRefGoogle ScholarPubMed
Kerslake, JI, Everett-Hinks, JM and Campbell, AW 2005 Lamb survival: a new examination of an old problem. Proceedings of the New Zealand Society of Animal Production 65: 13–18Google Scholar
Kuchel, RC and Lindsay, DR 1999 Maternal behaviour and the survival of lambs in superfine wool sheep. Reproduction, Fertility and Development 11: 391–394CrossRefGoogle ScholarPubMed
Lambe, NR, Conington, J, Bishop, SC, Waterhouse, A and Simm, G 2001 A genetic analysis of maternal behaviour score in Scottish Blackface sheep. Animal Science 72: 415–425CrossRefGoogle Scholar
Lambe, NR, Saurat, A, Conington, J, Bishop, SC and Simm, G 2006 Selection for carcass and maternal traits: effects on lambing difficulties in Scottish Blackface hill ewes. Proceedings of the British Society of Animal Science P37(A). York, UKGoogle Scholar
Leathwick, DM, Atkinson, DS, Miller, CM, Brown, AE and Sutherland, IA 2002 Benefits of reduced larval challenge through breeding for low faecal egg count in sheep. Novel Approaches III. A Workshop Meeting on Helminth Control in Livestock in the New Millennium 2-5 July 2002, Moredun Research Institute, UKGoogle Scholar
Legarra, A and Ugarte, E 2005 Genetic parameters of udder traits, somatic cell score and milk yield in Laxta sheep. Journal of Dairy Science 88: 2238–2245CrossRefGoogle ScholarPubMed
Leitner, G, Chaffer, M, Shamay, A, Shapiro, F, Merin, U, Ezra, E, Saran, A and Silanikove, N 2004 Changes in milk composition as affected by subclinical mastitis in sheep. Journal of Dairy Science 87: 46–52CrossRefGoogle ScholarPubMed
Le Neindre, P, Murphy, PM, Boissy, A, Purvis, IW, Lindsay, D, Orgeur, P, Bouix, J and Bibé, B 1998 Genetics of maternal ability in cattle and sheep. Proceedings of the 6th World Congress on Genetic Livestock Production 27: 23–30Google Scholar
Lévy, F, Gervais, R, Kinderman, U, Litterio, M, Poindron, P and Porter, R 1991 Effects of early postpartum separation on maternal selectivity and responsiveness in parturient ewes. Applied Animal Behaviour Science 31: 101–110CrossRefGoogle Scholar
Lévy, F, Lacatelli, A, Piketty, V, Tillet, Y and Poindron, P 1995 Involvement of the main but not the accessory olfactory system in maternal behaviour of primiparous and multiparous ewes. Physiology & Behaviour 57: 97–104CrossRefGoogle Scholar
Lewis, RD, Meyer, HH, Gradin, JL and Smith, AW 1988 Effectiveness of vaccination in controlling ovine footrot. Journal of Animal Science 67: 1160–1166Google Scholar
Litherland, AJ, S⊘renson, E, Niezen, J and Bishop, D 1992 A pilot evaluation of shedding sheep breeds compared with non-shedding breeds for susceptibility to nematodes and flystrike. Proceedings of the New Zealand Society of Animal Production 52: 233–235Google Scholar
Lopez-Villalobos, N and Garrick, DJ 1999 Genetic parameter estimates for lamb survival in Romney sheep. Proceedings of the New Zealand Society of Animal Production 59: 121–124Google Scholar
MacFarlane, JM, Matheson, SM and Dwyer, CM 2010 Genetic parameters for birth difficulty, lamb vigour and lamb sucking ability in Suffolk sheep. Animal Welfare 19: S99–S105Google Scholar
Matos, CAP, Thomas, DL, Nash, TG, Waldron, DF and Stookey, JM 1992 Genetic analyses of scrotal circumference size and growth in Rambouillet lambs. Journal of Animal Science 70: 43–50CrossRefGoogle ScholarPubMed
MacLeod, J 1992 Blowfly species composition in sheep myiasis in Britain. Medical & Veterinary Entomology 6(2): 177–178Google Scholar
McCutcheon, SN, Holmes, CW, McDonald, MF and Rae, AL 1983 Resistance to cold stress in the newborn lamb 1. Responses of Romney, Drysdale, Romney, and Merino lambs to components of the thermal environment. New Zealand Journal of Agricultural Research 26: 169–174CrossRefGoogle Scholar
McEwan, JC, Bisset, SA and Morris, CA 1997 The selection of sheep for natural resistance to internal parasites. In: Barrell, GK (ed) Sustainable Control of Internal Parasites in Ruminants pp 161-182. Lincoln University: Canterbury, New ZealandGoogle Scholar
Morris, CA, Vlassoff, A, Bissett, SA, Baker, RL, Watson, TG, West, CJ and Wheeler, M 2000a Continued selection of Romney sheep for resistance or susceptibility to nematode infection: estimates of direct and correlated responses. Animal Science 70: 17–27CrossRefGoogle Scholar
Morris, CA, Hickey, SM and Clarke, JN 2000b Genetic and environmental factors affecting lamb survival at birth and through to weaning. New Zealand Journal of Agricultural Research 43: 515–524CrossRefGoogle Scholar
Morris, CA, Vlassof, A, Bisset, SA, Baker, RL, West, CJ and Hurford, AP 1997 Responses of Romney sheep to selection for resistance or susceptibility to nematode infection. Animal Science 64: 319–329CrossRefGoogle Scholar
Morris, OS and Titchener, RN 1997 Blowfly species composition in sheep myiasis in Scotland. Medical & Veterinary Entomology 11(3): 253–256CrossRefGoogle ScholarPubMed
Nieuwhof, GJ, Conington, J, Bünger, L and Bishop, SC 2008 Genetic and phenotypic aspects of resistance to footrot in sheep of different breeds and ages. Animal 2 issue 9: 1289–1296Google Scholar
Nieuwhof, GJ, Conington, J and Bishop, SC 2009 A genetic epidemiological model to describe resistance to an endemic bacterial disease in livestock: application to footrot in sheep. Genetics Selection Evolution 41: 19. d.o.i: 10.1186/1297-9686-41-19Google Scholar
Nieuwhof, GJ and Bishop, SC 2005 Costs of the major endemic diseases of sheep in Great Britain and the potential benefits of reduction in disease impact. Animal Science 81: 23–29CrossRefGoogle Scholar
Nowak, R 1991 Development of mother discrimination by single and multiple newborn lambs. Animal Behaviour 42: 357–366CrossRefGoogle Scholar
Nowak, R 1996 Neonatal survival: contributions from behavioural studies in sheep. Applied Animal Behaviour Science 49: 61–72CrossRefGoogle Scholar
Nowak, RF and Lindsay, DR 1992 Discrimination of merino ewes by their newborn lambs: important for survival? Applied Animal Behaviour Science 34: 61–74CrossRefGoogle Scholar
Nowak, R, Murphy, TM, Lindsay, DR, Alster, P, Andersson, R and Uvnäs-Moberg, K 1997 Development of a preferential relationship with the mother by the newborn lamb: importance of the sucking activity. Physiology & Behavior 62: 681–688CrossRefGoogle ScholarPubMed
Nowak, R, Porter, RH, Lévy, F, Orgeur, P and Schaal, B 2000 Role of mother-young interactions in the survival of offspring in domestic mammals. Reviews of Reproduction 5: 153–163Google ScholarPubMed
O’Connor, CE 1996 Ewe maternal behaviour score and lamb growth: ten years on. Proceedings of the New Zealand Society of Animal Production 56: 107–109Google Scholar
O’Connor, CE and Lawrence, AB 1992 Relationship between lamb vigour and ewe behaviour at parturition. Animal Production 54: 361–366Google Scholar
O’Connor, CE, Jay, NP, Nicol, AM and Beatson, PR 1985 Ewe maternal behaviour score and lamb survival. Proceedings of the New Zealand Society of Animal Production 45: 159–162Google Scholar
Olesen, I, Navrud, S and Kolstad, K 2006 Economic values of animal welfare in breeding goals. Proceedings of the 8th World Congress in Genetic Applied Livestock Production pp 5. 13-18 August 2006, Belo Horizonte, BrazilGoogle Scholar
Owens, JL, Bindon, BM, Edey, TN and Piper, LR 1985 Behaviour at parturition and lamb survival of Booroola Merino sheep. Livestock Production Science 13: 359–372CrossRefGoogle Scholar
Perry, BD and Randolph, TF 1999 Improving the assessment of the economic impact of parasitic diseases and of their control in production animals. Veterinary Parasitology 84: 145–168CrossRefGoogle ScholarPubMed
Pickup, HE 2003 Maternal behaviour in the ewe: consistency in the expression of maternal behaviour during lactation and the effect of variation in maternal care on the development of offspring. PhD Thesis, University of Edinburgh, UKGoogle Scholar
Pickup, HE and Dwyer, CM 2002 Breed differences in the expression of maternal care at parturition persist throughout the lactation period in sheep. Proceedings of the British Society of Animal Science 70 (abstract)CrossRefGoogle Scholar
Poindron, P, Le Neindre, P, Raksanyi, I, Trillat, G and Orgeur, P 1980 Importance of the characteristics of the young in the manifestation and establishment of maternal behaviour in sheep. Reproductive Nutrition Development 20: 817–826CrossRefGoogle Scholar
Poindron, P, Lévy, F and Krehbiel, D 1988 Genital, olfactory and endocrine interactions in the development of maternal behaviour in the parturient ewe. Psychoneuroendocrinology 13: 99–125CrossRefGoogle ScholarPubMed
Poindron, P, Le Neindre, P, Levy, F and Keverne, EB 1984a The physiological mechanisms of the acceptance of the newborn among sheep. Biology of Behaviour 9: 65–88Google Scholar
Poindron, P, Raksanyi, I, Orgeur, P and Le Neindre, P 1984b Comparaison du comportement maternel en bergerie à la parturition chez des brebis primipares ou multipares de race Romanov, Préalpes du Sud et Ile-de-France. Genetics Selection Evolution 16: 503–522. [Title translation : Comparison of maternal behaviour at lambing time of primiparous or multiple parity Romanov, Préaples and Ile-de-France sheep breeds]CrossRefGoogle Scholar
Pollot, GE and Greeff, JC 2004 Genotype x environment interactions and genetic parameters for faecal egg count and production traits of Merino sheep. Journal of Animal Science 82: 2840–2851CrossRefGoogle Scholar
Pollot, GE, Karlsson, LJ, Eady, S and Greeff, JC 2004 Genetic parameters for indicators of host resistance to parasites from weaning to hogget age in Merino sheep. Journal of Animal Science 82(10): 2852–2864Google Scholar
Purser, AF and Young, GB 1983 Mothering ability in two hill flocks. British Veterinary Journal 139(4): 296–306CrossRefGoogle ScholarPubMed
Raadsma, HW 1991 Fleece rot and body strike in Merino sheep. V Heritability of liability to body strike in weaner sheep under flywave conditions. Australian Journal of Agricultural Research 42(2): 279–293Google Scholar
Raadsma, HW, Egerton, JR, Wood, D, Kristo, C and Nicholas, FW 1994 Disease resistance in Merino sheep III. Genetic variation in resistance following challenge and subsequent vaccination with an homologous rDNA pilus vaccine. Journal of Animal Breeding and Genetics 111(5-6): 367–390Google ScholarPubMed
Raadsma, HA, Gilmour, AR and Paxton, WJ 1989 Fleece rot and body strike in Merino sheep II. Phenotypic and genetic variation in liability to fleece rot following experimental induction. Australian Journal of Agricultural Research 40: 207–220CrossRefGoogle Scholar
Rathie, KA, Tierney, ML and Mulder, JC 1994 Assessing Wiltshire Horn-Merino crosses 1. Wool shedding, blowfly strike and wool production traits. Australian Journal of Experimental Agriculture 34: 717–728CrossRefGoogle Scholar
Rupp, R, Boichard, D, Barbat, A, Atruc, JM, Lagriffoul, G and Barillet, F 2002 Selection for mastitis resistance in French dairy sheep. In: Proceedings of the 7th World Congress on Genetics Applied to Livestock Production Paper no. 09-28. Montpellier, FranceGoogle Scholar
Rushen, J 1996 Using aversion learning techniques to assess the mental state, suffering and welfare of farm animals. Journal of Animal Science 74: 1990–1995CrossRefGoogle ScholarPubMed
Ryder, ML 1969 The development and structure of, and seasonal change in, the coat of some Wiltshire sheep. Animal Production 11: 467–477Google Scholar
Safari, A and Fogarty, NM 2003 Genetic Parameters for Sheep Production Traits: Estimates from the Literature. Technical Bulletin 49 NSW Agriculture. Orange Agricultural Institute: Orange, AustraliaGoogle Scholar
Safari, E, Fogarty, NM and Gilmour, AR 2005 A review of genetic parameter estimates for wool growth, meat and reproduction traits in sheep. Livestock Production Science 92: 271–289CrossRefGoogle Scholar
Samson, DE and Slee, J 1981 Factors affecting resistance to induced cooling in newborn lambs of 10 breeds. Animal Production 33: 59–65Google Scholar
Sawalha, RM, Conington, J, Brotherstone, S and Villanueva, B 2007 Analyses of lamb survival of Scottish Blackface sheep. Animal 01(1): 151–157CrossRefGoogle Scholar
Shillito-Walser, E, Hague, P and Walters, E 1981 Vocal recognition of recorded lambs voices by ewes of three breeds of sheep. Behaviour 78: 260–272Google Scholar
Simpson, SP and Slee, J 1998 The inheritance of non-response to noradrenaline in Scottish Blackface lambs. Genetic Research 51: 65–69CrossRefGoogle Scholar
Skerman, TM, Erasmuson, SK and Morrison, LM 1982 Duration of resistance to experimental footrot infection in Romney and Merino sheep vaccinated with Bacteriodes nodosus oil adjuvant vaccine. New Zealand Veterinary Journal 30: 27–31CrossRefGoogle Scholar
Slee, J, Alexander, G, Bradley, LR, Jackson, N and Stevens, D 1991 Genetic aspects of cold resistance and related characters in newborn Merino lambs. Australian Journal of Experimental Agriculture 31: 175–182CrossRefGoogle Scholar
Slee, J and Carter, HB 1961 A comparative study of fleece growth in Tasmanian Fine Merino and Wiltshire Horn ewes. Journal of Agricultural Science (Cambridge) 57: 11–19CrossRefGoogle Scholar
Slee, J and Carter, HB 1962 Fibre shedding and fibre-follicle relationships in the fleeces of Wiltshire Horn x Scottish Blackface sheep crosses. Journal of Agricultural Science (Cambridge) 58: 309–326CrossRefGoogle Scholar
Slee, J and Simpson, SP 1991 Description of the effects of a single gene which inhibits the normal metabolic response of newborn lambs to exogenous noradrenaline. Research in Veterinary Science 51: 34–39CrossRefGoogle ScholarPubMed
Slee, J and Springbett, A 1986 Early postnatal behaviour in lambs of ten breeds. Applied Animal Behaviour Science 15: 229–240Google Scholar
Slee, J and Stott, AW 1986 Genetic selection for cold resistance in Scottish Blackface lambs. Animal Production 43: 397–404Google Scholar
Smith, GM 1977 Factors affecting birth weight, dystocia and preweaning survival in sheep. Journal of Animal Science 44(5): 745–753CrossRefGoogle ScholarPubMed
Smith, JA, Wilson, K, Pilkington, JG and Pemberton, JM 1999 Heritable variation in resistance to gastrointestinal nematodes in an unmanaged mammal population. Proceedings of the Royal Society of London, Series B - Biological Sciences 266: 1283–1290CrossRefGoogle Scholar
Southey, BR, Rodriguez-Zas, SL and Leymaster, KA 2004 Competing risks analysis of lamb mortality in a terminal sire composite population. Journal of Animal Science 82: 2892–2899CrossRefGoogle Scholar
Stear, MJ, Bishop, SC, Bairden, K, Duncan, JL, Gettinby, G, Holmes, PH, McKellar, QA, Park, M, Strain, S and Murray, M 1997 The heritability of worm burden and worm fecundity in lambs following natural nematode infection. Nature 389: 27CrossRefGoogle Scholar
Stevens, D, Alexander, G and Lynch, JJ 1982 Lamb mortality due to inadequate care of twins by merino ewes. Applied Animal Ethology 8: 243–252CrossRefGoogle Scholar
Stevens, D, Alexander, G, Mottershead, B and Lynch, JJ 1984 Role of the lamb in post-partum separation of ewes from twin lambs. Proceedings of the Australian Journal of Animal Production 15: 751Google Scholar
Stewart, DJ, Emery, DW, Clark, BL, Peterson, JE, Iyer, H and Jarrett, RG 1985 Differences between breeds of sheep in their response to Bacteroides nodosus vaccines. Australian Veterinary Journal 62: 116–120CrossRefGoogle Scholar
Strain, SAJ, Bishop, SC, Henderson, NG, Kerr, A, McKellar, QA, Mitchell, S and Stear, MJ 2002 The genetic control of IgA activity against Telodorsagia circumcincta and its association with parasite resistance in naturally infected sheep. Parasitology 124: 545–552CrossRefGoogle Scholar
Sykes, AR, Griffiths, RG and Slee, J 1976 Influence of breed, birth weight and weather on the body temperature of newborn lambs. Animal Production 22: 395–402Google Scholar
Terrazas, A, Nowak, R, Serafín, N, Ferreira, G, Lévy, F and Poindron, P 2002 Twenty-four-hour-old lambs rely more on maternal behaviour than on the learning of individual characteristics to discriminate between their own and an alien mother. Developmental Psychobiology 40: 408–418CrossRefGoogle Scholar
Tierney, ML 1978 Easy care Merinos through cross-breeding with Wiltshire Horn sheep. Wool Technology and Sheep Breeding 26(3): 21–25Google Scholar
Vipond, J 2006 Easicare Sheep Systems. SAC Select Services: Penicuik, Scotland, UKGoogle Scholar
Waller, PJ, Donnelly, JR, Dobson, RJ, Donald, AD, Axelsen, A and Morley, FHW 1987a Effects of helminth infection on the pre-weaning production of ewes and lambs: evaluation of pre- and post-lambing drenching and provision of safe lambing pasture. Australian Veterinary Journal 64: 339–343Google Scholar
Waller, PJ, Axelsen, A, Donald, AD, Morley, FHW, Dobson, RJ and Donnelly, JR 1987b Effects of helminth infection on the pre-weaning production of ewes and lambs: comparison between safe and contaminated pasture. Australian Veterinary Journal 64: 357–362CrossRefGoogle Scholar
Watson, TG, Baker, RL and Harvey, TG 1986 Genetic variation in resistance or tolerance to internal nematode parasites in strains of sheep at Rotomahana. Proceedings of the New Zealand Society of Animal Production 46: 23–26Google Scholar
Winter, AC 2004 Lameness in Sheep. Crowood Press Ltd: Marlborough, Wiltshire, UKGoogle Scholar
Wolff, JE, Baker, RL, Dobbie, PM, Ford, AJ and Jordon, RB 1987 Genetic aspects of cold resistance in newborn lambs. Proceedings of the New Zealand Society of Animal Production 47: 93–98Google Scholar
Woolaston, RR and Piper, LR 1996 Selection of merino sheep for resistance to Haemonchus contortus: genetic variation. Animal Science 62: 451–460CrossRefGoogle Scholar
Woolaston, RR and Windon, RG 2001 Selection of sheep for response to Trichostrongylus colubriformis larvae: genetic parameters. Animal Science 73: 41–48CrossRefGoogle Scholar