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Reducing the level of nutrition of twin-bearing ewes during mid to late pregnancy produces leaner prime lambs at slaughter

Published online by Cambridge University Press:  15 October 2019

M. I. Knight Open the ORCID record for M. I. Knight [Opens in a new window] ,
K. L. Butler ,
L. L. Slocombe ,
N. P. Linden ,
M. C. Raeside ,
V. F. Burnett ,
A. J. Ball ,
M. B. McDonagh  and
R. Behrendt
M. I. Knight*
Affiliation:
Agriculture Victoria Research, Department of Economic Development, Jobs, Transport and Resources, 915 Mt Napier Road, Hamilton, VIC 3300, Australia
K. L. Butler
Affiliation:
Agriculture Victoria Research, Department of Economic Development, Jobs, Transport and Resources, 915 Mt Napier Road, Hamilton, VIC 3300, Australia
L. L. Slocombe
Affiliation:
Agriculture Victoria Research, Department of Economic Development, Jobs, Transport and Resources, 915 Mt Napier Road, Hamilton, VIC 3300, Australia
N. P. Linden
Affiliation:
Agriculture Victoria Research, Department of Economic Development, Jobs, Transport and Resources, 915 Mt Napier Road, Hamilton, VIC 3300, Australia
M. C. Raeside
Affiliation:
Agriculture Victoria Research, Department of Economic Development, Jobs, Transport and Resources, 915 Mt Napier Road, Hamilton, VIC 3300, Australia
V. F. Burnett
Affiliation:
Agriculture Victoria Research, Department of Economic Development, Jobs, Transport and Resources, 915 Mt Napier Road, Hamilton, VIC 3300, Australia
A. J. Ball
Affiliation:
Rural Analytics, 19 Eleanor Close, Armidale, NSW 2350, Australia
M. B. McDonagh
Affiliation:
The Australian Wagyu Association, 146 Marsh St, Armidale, NSW 2350, Australia
R. Behrendt
Affiliation:
Agriculture Victoria Research, Department of Economic Development, Jobs, Transport and Resources, 915 Mt Napier Road, Hamilton, VIC 3300, Australia
*
†E-mail: [email protected]
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Abstract

The Australian prime lamb industry is seeking to improve lean meat yield (LMY) as a means to increasing efficiency and profitability across the whole value chain. The LMY of prime lambs is affected by genetics and on-farm nutrition from birth to slaughter and is the total muscle weight relative to the total carcass weight. Under the production conditions of south eastern Australia, many ewe flocks experience a moderate reduction in nutrition in mid to late pregnancy due to a decrease in pasture availability and quality. Correcting nutritional deficits throughout gestation requires the feeding of supplements. This enables the pregnant ewe to meet condition score (CS) targets at lambing. However, limited resources on farm often mean it is difficult to effectively manage nutritional supplementation of the pregnant ewe flock. The impact of reduced ewe nutrition in mid to late pregnancy on the body composition of finishing lambs and subsequent carcass composition remains unknown. This study investigated the effect of moderately reducing ewe nutrition in mid to late gestation on the body composition of finishing lambs and carcass composition at slaughter on a commercial scale. Multiple born lambs to CS2.5 target ewes were lighter at birth and weaning, had lower feedlot entry and exit weights with lower pre-slaughter and carcass weights compared with CS3.0 and CS3.5 target ewes. These lambs also had significantly lower eye muscle and fat depth when measured by ultrasound prior to slaughter and carcass subcutaneous fat depth measured 110 mm from the spine along the 12th rib (GR 12th) and at the C-site (C-fat). Although carcasses were ~5% lighter, results showed that male progeny born to ewes with reduced nutrition from day 50 gestation to a target CS2.5 at lambing had a higher percentage of lean tissue mass as measured by dual energy X-ray absorptiometry and a lower percentage of fat during finishing and at slaughter, with the multiple born progeny from CS3.0 and CS3.5 target ewes being similar. These data suggest lambs produced from multiple bearing ewes that have had a moderate reduction in nutrition during pregnancy are less mature. This effect was also independent of lamb finishing system. The 5% reduction in carcass weight observed in this study would have commercially relevant consequences for prime lamb producers, despite a small gain in LMY.

Keywords

sheepgestational nutritionbody compositioncondition scoresaleable meat yield
Type
Research Article
Information
animal , Volume 14 , Issue 4 , April 2020 , pp. 864 - 872
Copyright
© This is a work of the Commonwealth Government of Australia and the State Government of Victoria and is not subject to copyright protection in Commonwealth Government of Australia and the State Government of Victoria 2019 

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References

Anderson, F, Pannier, L, Pethick, D and Gardner, G 2015. Intramuscular fat in lamb muscle and the impact of selection for improved carcass lean meat yield. Animal 90, 1081–1090.CrossRefGoogle Scholar
Anonymous 1992. AUS_MEAT language, 4th edition. Authority for the uniform specification meat and livestock, Sydney, Australia.Google Scholar
Anonymous 2004. Australian code of practice for the care and use of animals for scientific purposes, 7th edition. Australian Government, Canberra, Australia.Google Scholar
Australian Fodder Industry Association (AFIA) 2011. Laboratory methods manual: a reference manual of standard methods for the analysis of fodder. Australian Fodder Industry Association Inc., Melbourne, Victoria, Australia.Google Scholar
Butterfield, R 1988. New concepts of sheep growth. Griffin Press, Netley, South Australia.Google Scholar
Cayley, JWD and Bird, PR (1996) Techniques for measuring pastures. Pastoral and Veterinary Institute Hamilton, Agriculture Victoria, Hamilton, Victoria, Australia.Google Scholar
De Blasio, MJ, Gatford, KL, Robinson, JS and Owens, JA 2007. Placental restriction of fetal growth reduces size at birth and alters postnatal growth, feeding activity, and adiposity in the young lamb. American Journal of Physiology 292, R875–R886.Google ScholarPubMed
Dunshea, FR, Suster, D, Eason, PJ, Warner, RD, Hopkins, DL, and Ponnampalam, EN 2007. Accuracy of dual energy X-ray absorptiometry, weight, longissimus lumborum muscle depth and GR fat depth to predict half carcass composition in sheep. Australian Journal of Experimental Agriculture 47, 1165–1171.CrossRefGoogle Scholar
Gardner, GE, Williams, A, Ball, AJ, Jacob, RH, Refshauge, G, Hocking Edwards, J, Behrendt, R and Pethick, DW (2015) Carcase weight and dressing percentage are increased using Australian Sheep Breeding Values for increased weight and muscling and reduced fat depth. Meat Science 99, 89–98.CrossRefGoogle ScholarPubMed
Greenwood, PL, Hunt, AS, Hermanson, JW and Bell, AW 1998. Effects of birth weight and postnatal nutrition on neonatal sheep: I. Body growth and composition, and some aspects of energetic efficiency. Journal of Animal Science 76, 2354–2367.CrossRefGoogle ScholarPubMed
Greenwood, PL, Thompson, A and Ford, S 2010. Postnatal consequences of the maternal environment and of growth during prenatal life for productivity of ruminants. In Managing the prenatal environment to enhance livestock productivity (ed. Greenwood, PL, Bell, AW, Vercoe, PE and Viljoen, GJ), pp. 3–36. Springer, the Netherlands.CrossRefGoogle Scholar
Hodgson, J (1981). Sward measurement handbook. British Grassland Society, Cirencester, UK.Google Scholar
Hunter, TE, Suster, D, Dunshea, FR, Cummins, LJ, Egan, AR and Leury, BJ 2011. Dual energy X-ray absorptiometry (DXA) can be used to predict live animal and whole carcass composition of sheep. Small Ruminant Research 100, 143–152.CrossRefGoogle Scholar
Husted, SM, Nielsen, MO, Tygesen, MP, Kiani, A, Blache, D and Ingvartsen, KL 2007. Programming of intermediate metabolism in young lambs affected by late gestational maternal undernourishment. American Journal of Physiology – Endocrinology and Metabolism 293, E548–E557.CrossRefGoogle ScholarPubMed
Jaquiery, AL, Oliver, MH, Bloomfield, FH and Harding, JE 2011. Periconceptional events perturb postnatal growth regulation in sheep. Pediatric Research 70, 261.CrossRefGoogle Scholar
Kenyon, PR and Blair, HT 2014. Foetal programming in sheep – effects on production. Small Ruminant Research 118, 16–30.CrossRefGoogle Scholar
Oldham, CM, Thompson, AN, Ferguson, MB, Gordon, DJ, Kearney, GA, and Paganoni, BL 2011. The birthweight and survival of Merino lambs can be predicted from the profile of liveweight change of their mothers during pregnancy. Animal Production Science 51, 776–783.CrossRefGoogle Scholar
Paganoni, BL, Oldham, CM, Ferguson, MB, Thompson, AN, Vercoe, PE and Gordon, DJ 2013. Ewe nutrition during pregnancy and birthweight of lambs has minimal impact on fat and eye muscle depth in Merino progeny. Animal Production Science 53, 509–515.CrossRefGoogle Scholar
Pethick, DW, Banks, R, Hales, J and Ross, I 2006. Australian prime lamb – a vision for 2020. In Wool meets meat (ed. Cronje, P and Maxwell, D), pp. 194–201. Sheep CRC, Orange, NSW, Australia.Google Scholar
Pethick, DW, Hopkins, DL and McPhee, M 2007. Development of intramuscular fat in prime lambs, young sheep and beef cattle. In Agribusiness sheep updates. The Western Australian Department of Primary Industries Regional Development, Perth, Western Australia, Australia.Google Scholar
Ponnampalam, EN, Behrendt, R, Kerr, MG, Raeside, MC and McDonagh, MB 2018. The influence of the level of ewe gestation nutrition and lamb finishing diet on long-chain polyunsaturated fat concentration, antioxidant and mineral status, and colour stability of meat. Animal Production Science 58, 1481–1487.CrossRefGoogle Scholar
Robinson, JJ, Mcdonald, I, Fraser, C and Crofts, RMJ 1977. Studies on reproduction in prolific ewes. 1. Growth of products of conception. Journal of Agricultural Science 88, 539–552.CrossRefGoogle Scholar
Rosales Nieto, CA, Ferguson, MB, Thompson, H, Briegel, JR, Macleay, CA, Martin, GB and Thompson, AN 2015. Relationships among puberty, muscle and fat, and liveweight gain during mating in young female sheep. Reproduction in Domestic Animals 50, 637–642.CrossRefGoogle ScholarPubMed
Thompson, AN, Ferguson, MB, Campbell, AJD, Gordon, DJ, Kearney, GA, Oldham, CM and Paganoni, BL 2011. Improving the nutrition of Merino ewes during pregnancy and lactation increases weaning weight and survival of progeny but does not affect their mature size. Animal Production Science 51, 784–793.CrossRefGoogle Scholar
van Burgel, AJ, Oldham, CM, Behrendt, R, Curnow, M, Gordon, DJ and Thompson, AN (2011). The merit of condition score and fat score as alternatives to liveweight for managing the nutrition of ewes. Animal Production Science 51, 834–841.CrossRefGoogle Scholar
VSN International 2015. Genstat reference manual (Release 18), Part 1 summary. VSN International, Hemel Hempstead, UK.Google Scholar
Young, JM, Thompson, AN and Kennedy, AJ (2010) Bioeconomic modelling to identify the relative importance of a range of critical control points for prime lamb production systems in south-west Victoria. Animal Production Science 50, 748–756.CrossRefGoogle Scholar