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Heifer fertility and carry over consequences for life time production in dairy and beef cattle

Published online by Cambridge University Press:  03 April 2014

D. C. Wathes ,
G. E. Pollott ,
K. F. Johnson ,
H. Richardson  and
J. S. Cooke
D. C. Wathes*
Affiliation:
Department of Production and Population Health, Royal Veterinary College, Hawkshead Lane, North Mymms, Hatfield, Herts, AL9 7 TA, UK
G. E. Pollott
Affiliation:
Department of Production and Population Health, Royal Veterinary College, Hawkshead Lane, North Mymms, Hatfield, Herts, AL9 7 TA, UK
K. F. Johnson
Affiliation:
Department of Production and Population Health, Royal Veterinary College, Hawkshead Lane, North Mymms, Hatfield, Herts, AL9 7 TA, UK
H. Richardson
Affiliation:
Centre for Dairy Information, Scotsbridge House, Scots Hill, Rickmansworth, Herts, WD3 3BB, UK
J. S. Cooke
Affiliation:
Volac, Orwell, Royston, Herts, SG8 5QX, UK
*
†E-mail: [email protected]
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Abstract

The rearing period has a key influence on the later performance of cattle, affecting future fertility and longevity. Producers usually aim to breed replacement heifers by 15 months to calve at 24 months. An age at first calving (AFC) close to 2 years (23 to 25 months) is optimum for economic performance as it minimises the non-productive period and maintains a seasonal calving pattern. This is rarely achieved in either dairy or beef herds, with average AFC for dairy herds usually between 26 and 30 months. Maintaining a low AFC requires good heifer management with adequate growth to ensure an appropriate BW and frame size at calving. Puberty should occur at least 6 weeks before the target breeding age to enable animals to undergo oestrous cycles before mating. Cattle reach puberty at a fairly consistent, but breed-dependent, proportion of mature BW. Heifer fertility is a critical component of AFC. In US Holsteins the conception rate peaked at 57% at 15 to 16 months, declining in older heifers. Wide variations in growth rates on the same farm often lead to some animals having delayed first breeding and/or conception. Oestrous synchronisation regimes and sexed semen can both be used but unless heifers have been previously well-managed the success rates may be unacceptably low. Altering the nutritional input above or below those needed for maintenance at any stage from birth to first calving clearly alters the average daily gain (ADG) in weight. In general an ADG of around 0.75 kg/day seems optimal for dairy heifers, with lower rates delaying puberty and AFC. There is some scope to vary ADG at different ages providing animals reach an adequate size by calving. Major periods of nutritional deficiency and/or severe calfhood disease will, however, compromise development with long-term adverse consequences. Infectious disease can also cause pregnancy loss/abortion. First lactation milk yield may be slightly lower in younger calving cows but lifetime production is higher as such animals usually have good fertility and survive longer. There is now extensive evidence that as long as the AFC is >23 months then future performance is not adversely influenced. On the other hand, delayed first calving >30 months is associated with poor survival. Underfeeding of young heifers reduces their milk production potential and is a greater problem than overfeeding. Farmers are more likely to meet the optimum AFC target of 23 to 25 months if they monitor growth rates and adjust feed accordingly.

Keywords

cattlepubertygrowthmilk productionlongevity
Type
Full Paper
Information
animal , Volume 8 , Supplement s1: New Science ‐ New Practices International Cow Fertility Conference 18‐21 May 2014, Westport, Ireland , May 2014 , pp. 91 - 104
Copyright
© The Animal Consortium 2014 

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References

Adamiak, SJ, Mackie, K, Watt, RG, Webb, R and Sinclair, KD 2005. Impact of nutrition on oocyte quality: cumulative effects of body composition and diet leading to hyperinsulinemia in cattle. Biology of Reproduction 73, 918–926.CrossRefGoogle ScholarPubMed
Ambrose, JD, Kastelic, JP, Rajamahendran, R, Aali, M and Dinn, N 2005. Progesterone (CIDR)-based timed AI protocols using GnRH, porcine LH or estradiol cypionate for dairy heifers: ovarian and endocrine responses and pregnancy rates. Theriogenology 64, 1457–1474.CrossRefGoogle ScholarPubMed
Bach, A 2011. Associations between several aspects of heifer development and dairy cow survivability to second lactation. Journal of Dairy Science 94, 1052–1057.CrossRefGoogle ScholarPubMed
Bach, A and Ahedo, J 2008. Record keeping and economics of dairy heifers. Veterinary Clinics of North America: Food Animal Practice 24, 117–138.Google ScholarPubMed
Bar-Peled, U, Robinzon, B, Maltz, E, Tagari, H, Folman, Y, Bruckental, I, Voet, H, Gacitua, H and Lehrer, AR 1997. Increased weight gain and effects on production parameters of Holstein heifer calves that were allowed to suckle from birth to six weeks of age. Journal of Dairy Science 80, 2523–2528.CrossRefGoogle ScholarPubMed
Bleach, E, Gould, M, Blackie, N and Beever, D 2005. Growth performance of Holstein-Friesian heifer calves reared using three milk replacer feeding regimes. In Recent advances in animal nutrition (ed. PC Garnsworthy and J Wiseman), pp. 347–355. Nottingham University Press, Nottingham, UK.Google Scholar
Bormann, JM, Totir, LR, Kachman, SD, Fernando, RL and Wilson, DE 2006. Pregnancy rate and first-service conception rate in Angus heifers. Journal of Animal Science 84, 2022–2025.CrossRefGoogle ScholarPubMed
Brickell, JS, McGowan, MM and Wathes, DC 2009a. Effect of management factors and blood metabolites during the rearing period on growth in dairy heifers on UK farms. Domestic Animal Endocrinology 36, 67–81.CrossRefGoogle ScholarPubMed
Brickell, JS, Bourne, N, McGowan, MM and Wathes, DC 2009b. Effect of growth and development during the rearing period on the subsequent fertility of nulliparous Holstein-Friesian heifers. Theriogenology 72, 408–416.CrossRefGoogle ScholarPubMed
Brickell, JS, McGowan, MM and Wathes, DC 2010. Association between Neospora caninum seropositivity and perinatal mortality in dairy heifers at first calving. Veterinary Record 167, 82–85.CrossRefGoogle ScholarPubMed
Brown, EG, Vandehaar, MJ, Daniels, KM, Liesman, JS, Chapin, LT, Forrest, JW, Akers, RM, Pearson, RE and Nielsen, MS 2005. Effect of increasing energy and protein intake on mammary development in heifer calves. Journal of Dairy Science 88, 595–603.CrossRefGoogle ScholarPubMed
Buskirk, DD, Faulkner, DB and Ireland, FA 1995. Increased post weaning gain of beef heifers enhances fertility and milk production. Journal of Animal Science 73, 937–946.CrossRefGoogle Scholar
Byerley, DJ, Berardinelli, JG, Staigmiller, RB and Short, RE 1987. Progesterone concentrations in beef heifers bred at puberty or third estrus. Journal of Animal Science 65, 1571–1575.CrossRefGoogle ScholarPubMed
Capuco, AV, Smith, JJ, Waldo, DR and Rexroad, CE 1995. Influence of prepubertal dietary regimen on mammary growth of Holstein heifers. Journal of Dairy Science 78, 2709–2725.CrossRefGoogle ScholarPubMed
Carson, AF, Wylie, ARG, McEvoy, JDG, McCoy, M and Dawson, LER 2000. Effects of plane of nutrition and diet type on mammogenic hormone concentrations, growth and milk production in high genetic merit dairy herd replacements. Animal Science 70, 349–362.CrossRefGoogle Scholar
Carson, AF, Dawson, LER, McCoy, MA, Kilpatrick, DJ and Gordon, FJ 2002. Effects of rearing regime on body size, reproductive performance and milk production during the first lactation in high genetic merit dairy herd replacements. Animal Science 74, 553–565.CrossRefGoogle Scholar
Clempson, AM, Pollott, GE, Brickell, JS, Bourne, NE, Munce, N and Wathes, DC 2011. Evidence that leptin genotype is associated with fertility, growth, and milk production in Holstein cows. Journal of Dairy Science 94, 3618–3628.CrossRefGoogle ScholarPubMed
Cole, JB and Null, DJ 2010. Age at first calving in Holstein cattle in the United States. Journal of Dairy Science 93, 594. (abstract W28).Google Scholar
Cooke, JS, Cheng, Z, Bourne, NE and Wathes, DC 2013. Association between growth rates, age at first calving and subsequent fertility, milk production and survival in Holstein-Friesian heifers. Open Journal of Animal Sciences 3, 1–12.CrossRefGoogle Scholar
Cooke, RF, Bohnert, DW, Cappellozza, BI, Mueller, CJ and Delcurto, T 2012. Effects of temperament and acclimation to handling on reproductive performance of Bos Taurus beef females. Journal of Animal Science 90, 3547–3555.CrossRefGoogle ScholarPubMed
Correa, MT, Curtis, CR, Erb, HN and White, ME 1988. Effect of calflhood morbidity on age at first calving in New York Holstein herds. Preventative Veterinary Medicine 6, 253–262.CrossRefGoogle Scholar
Crowley, JJ, Evans, RD, Mc Hugh, N, Kenny, DA, McGee, M, Crews, DH and Berry, DP 2011. Genetic relationships between feed efficiency in growing males and beef cow performance. Journal of Animal Science 89, 3372–3381.CrossRefGoogle ScholarPubMed
Cunningham, MJ, Clifton, DK and Steiner, RA 1999. Leptin’s actions on the reproductive axis: perspectives and mechanisms. Biology of Reproduction 60, 216–222.CrossRefGoogle ScholarPubMed
Daniels, KM, McGilliard, ML, Meyer, MJ, Van Amburgh, ME, Capuco, AV and Akers, RM 2009. Effects of body weight and nutrition on histological mammary development in Holstein heifers. Journal of Dairy Science 92, 499–505.CrossRefGoogle ScholarPubMed
Davis Rincker, LE, VandeHaar, MJ, Wolf, CA, Liesman, JS, Chapin, LT and Weber Nielson, MS 2011. Effect of intensified feeding of heifer calves on growth, pubertal age, calving age, milk yield, and economics. Journal of Dairy Science 94, 3554–3567.CrossRefGoogle ScholarPubMed
Davison, HC, French, NP and Trees, AJ 1999. Herd-specific and age-specific seroprevalence of Neospora caninum in 14 British dairy herds. Veterinary Record 144, 547–550.CrossRefGoogle ScholarPubMed
Dawson, LER and Carson, AF 2004. Management of the dairy heifer. Cattle Practice 12, 181–192.Google Scholar
Day, ML 2004. Hormonal induction of estrous cycles in anestrous Bos taurus beef cows. Animal Reproduction Science 82–83, 487–494.CrossRefGoogle ScholarPubMed
Day, ML, Imakawa, K, Wolfe, PL, Kittok, RJ and Kinder, JE 1987. Endocrine mechanisms of puberty in heifers. Role of hypothalamo-pituitary estradiol receptors in the negative feedback of estradiol on luteinizing hormone secretion. Biology of Reproduction 37, 1054–1065.CrossRefGoogle ScholarPubMed
Derks, M, van de Ven, LM, van Werven, T, Kremer, WD and Hogeveen, H 2012. The perception of veterinary herd health management by Dutch dairy farmers and its current status in the Netherlands: a survey. Preventative Veterinary Medicine 104, 207–215.CrossRefGoogle ScholarPubMed
DeVuyst, EA, Bauer, ML, Cheng, FC, Mitchell, J and Larson, D 2008. The impact of a leptin gene SNP on beef calf weaning weights. Animal Genetics 39, 284–286.CrossRefGoogle ScholarPubMed
Donovan, GA, Dohoo, IR, Montgomery, DM and Bennett, FL 1998. Calf and disease factors affecting growth in female Holstein calves in Florida, USA. Preventative Veterinary Medicine 33, 1–10.CrossRefGoogle ScholarPubMed
Ducrocq, V, Quaas, RL, Pollak, EJ and Casella, G 1988. Length of productive life of dairy cows. 2. Variance component estimation and sire evaluation. Journal of Dairy Science 71, 3071–3079.CrossRefGoogle Scholar
Eaglen, SA, Coffey, MP, Woolliams, JA and Wall, E 2013. Direct and maternal genetic relationships between calving ease, gestation length, milk production, fertility, type, and lifespan of Holstein-Friesian primiparous cows. Journal of Dairy Science 96, 4015–4025.CrossRefGoogle ScholarPubMed
Eastham, N 2012. Long term effects of age at first calving. The Journal for Holstein UK and British Friesian Breeders August 114–115.Google Scholar
Eborn, DR and Grieger, DM 2013. Timed insemination of beef heifers using the 7-11 Synch protocol. Journal of Animal Science 91, 666–672.CrossRefGoogle ScholarPubMed
Endecott, RL, Funston, RN, Mulliniks, JT and Roberts, AJ 2013. Joint Alpharma-Beef Species Symposium: implications of beef heifer development systems and lifetime productivity. Journal of Animal Science 91, 1329–1335.CrossRefGoogle ScholarPubMed
Engelken, TJ 2008. The development of beef breeding bulls. Theriogenology 70, 573–575.CrossRefGoogle ScholarPubMed
Ettema, JF and Santos, JE 2004. Impact of age at calving on lactation, reproduction, health, and income in first-parity Holsteins on commercial farms. Journal of Dairy Science 87, 2730–2742.CrossRefGoogle ScholarPubMed
Evans, RD, Wallace, M, Garrick, DJ, Dillon, P, Berry, DP and Olori, V 2006. Effects of calving age, breed fraction and month of calving on calving interval and survival across parities in Irish spring-calving dairy cows. Livestock Science 100, 216–230.CrossRefGoogle Scholar
Ferrell, CL 1982. Effects of postweaning rate of gain on onset of puberty and productive performance of heifers of different breeds. Journal of Animal Science 55, 1272–1283.CrossRefGoogle ScholarPubMed
Ford, JA and Park, CS 2001. Nutritionally directed compensatory growth enhances heifer development and lactation potential. Journal of Dairy Science 84, 1669–1678.CrossRefGoogle ScholarPubMed
Fortes, MR, Snelling, WM, Reverter, A, Nagaraj, SH, Lehnert, SA, Hawken, RJ, DeAtley, KL, Peters, SO, Silver, GA, Rincon, G, Medrano, JF, Islas-Trejo, A and Thomas, MG 2012. Gene network analyses of first service conception in Brangus heifers: use of genome and trait associations, hypothalamic-transcriptome information, and transcription factors. Journal of Animal Science 90, 2894–2906.CrossRefGoogle ScholarPubMed
Freetly, HC, Ferrell, CL and Jenkins, TG 2001. Production performance of beef cows raised on three different nutritionally controlled heifer development programs. Journal of Animal Science 79, 819–826.CrossRefGoogle ScholarPubMed
Funston, RN and Deutscher, GH 2004. Comparison of target breeding weight and breedingdate for replacement beef heifers and effects on subsequent reproduction and calf performance. Journal of Animal Science 82, 3094–3099.CrossRefGoogle ScholarPubMed
Garcia, MR, Amstalden, M, Morrison, CD, Keisler, DH and Williams, GL 2003. Age at puberty, total fat and conjugated linoleic acid content of carcass, and circulating metabolic hormones in beef heifers fed a diet high in linoleic acid beginning at four months of age. Journal of Animal Science 81, 261–268.CrossRefGoogle ScholarPubMed
Garnsworthy, PC 2004. The environmental impact of fertility in dairy cows: a modelling approach to predict methane and ammonia emissions. Animal Feed Science and Technology 112, 211–223.CrossRefGoogle Scholar
Gasser, CL 2013. Joint Alpharma-Beef Species Symposium: considerations on puberty in replacement beef heifers. Journal of Animal Science 91, 1336–1340.CrossRefGoogle ScholarPubMed
Givens, MD and Marley, MS 2008. Infectious causes of embryonic and fetal mortality. Theriogenology 70, 270–285.CrossRefGoogle ScholarPubMed
Guo, Y, Chen, H, Lan, X, Zhang, B, Pan, C, Zhang, L, Zhang, C and Zhao, M 2008. Novel SNPs of the bovine LEPR gene and their association with growth traits. Biochemical Genetics 46, 828–834.CrossRefGoogle ScholarPubMed
Hansen, M, Lund, MS, Pedersen, J and Christensen, LG 2004. Genetic parameters for stillbirth in Danish Holstein cows using a Bayesian threshold model. Journal of Dairy Science 87, 706–716.CrossRefGoogle ScholarPubMed
Haworth, GM, Tranter, WP, Chuck, JN, Cheng, Z and Wathes, DC 2008. Relationships between age at first calving and first lactation milk yield, and lifetime productivity and longevity in dairy cows. Veterinary Record 162, 643–647.CrossRefGoogle ScholarPubMed
Hayhurst, C, Sørensen, MK, Royal, MD and Løvendahl, P 2007. Metabolic regulation in Danish bull calves and the relationship to the fertility of their female offspring. Journal of Dairy Science 90, 3909–3916.CrossRefGoogle Scholar
Heinrichs, AJ and Heinrichs, BS 2011. A prospective study of calf factors affecting first-lactation and lifetime milk production and age of cows when removed from the herd. Journal of Dairy Science 94, 336–341.CrossRefGoogle ScholarPubMed
Heinrichs, AJ, Heinrichs, BS, Harel, O, Rogers, GW and Place, NT 2005. A prospective study of calf factors affecting age, body size, and body condition score at first calving of Holstein dairy heifers. Journal of Dairy Science 88, 2828–2835.CrossRefGoogle ScholarPubMed
Hickson, RE, Anderson, WJ, Kenyon, PR, Lopez-Villalobos, N and Morris, ST 2008. A survey of beef cattle farmers in New Zealand, examining management practices of primiparous breeding heifers. New Zealand Veterinary Journal 56, 176–183.CrossRefGoogle ScholarPubMed
Hickson, RE, Anderson, WJ, Kenyon, PR, Lopez-Villalobos, N and Morris, ST 2012. A survey detailing the calving performance of primiparous 2-year-old beef heifers and outcomes of assisted calving. New Zealand Veterinary Journal 60, 35–41.CrossRefGoogle ScholarPubMed
Hoffman, PC 1997. Optimum body size of Holstein replacement heifers. Journal of Animal Science 75, 836–845.CrossRefGoogle ScholarPubMed
Hoffman, PC, Brehm, NM, Price, SG and Prill-Adams, A 1996. Effect of accelerated postpubertal growth and early calving on lactation performance of primiparous Holstein heifers. Journal of Dairy Science 79, 2024–2031.CrossRefGoogle ScholarPubMed
Holm, DE, Thompson, PN and Irons, PC 2009. The value of reproductive tract scoring as a predictor of fertility and production outcomes in beef heifers. Journal of Animal Science 87, 1934–1940.CrossRefGoogle ScholarPubMed
Hultgren, J and Svensson, C 2010. Calving interval in dairy cows in relation to heifer rearing conditions in southwest Sweden. Reproduction in Domestic Animals 45, 136–141.CrossRefGoogle ScholarPubMed
Irish Cattle Breeding Federation (ICBF) 2013. Suckler herd fertility showing steady improvement, but still a way to go. Retrieved March 10, 2014, from http://www.icbf.com/?p=1312 Google Scholar
Jagannatha, S, Keown, JF and Van Vleck, LD 1998. Estimation of relative economic value for herd life of dairy cattle from profile equations. Journal of Dairy Science 81, 1702–1708.CrossRefGoogle ScholarPubMed
Johanson, JM and Berger, PJ 2003. Birth weight as a predictor of calving ease and perinatal mortality in Holstein cattle. Journal of Dairy Science 86, 3745–3755.CrossRefGoogle ScholarPubMed
Johnson, KF, Burn, CC and Wathes, DC 2011. Rates and risk factors for contagious disease and mortality in young dairy heifers. CAB Reviews: Perspectives in Agriculture, Veterinary Science, Nutrition and Natural Resources 6, 059.Google Scholar
Keown, JF and Everett, RW 1986. Effect of days carried calf, days dry, and weight of first calf heifers on yield. Journal of Dairy Science 69, 1891–1896.CrossRefGoogle ScholarPubMed
Khan, MA, Weary, DM and von Keyserlingk, MA 2011. Invited review: effects of milk ration on solid feed intake, weaning and performance in dairy heifers. Journal of Dairy Science 94, 1071–1081.CrossRefGoogle ScholarPubMed
Kuhn, MT, Hutchison, JL and Wiggans, GR 2006. Characterization of Holstein heifer fertility in the United States. Journal of Dairy Science 89, 4907–4920.CrossRefGoogle ScholarPubMed
Lammers, BP, Heinrichs, AJ and Kensinger, RS 1999. The effects of accelerated growth rates and estrogen implants in prepubertal Holstein heifers on estimates of mammary development and subsequent reproduction and milk production. Journal of Dairy Science 82, 1753–1764.CrossRefGoogle ScholarPubMed
Larson, RL 2007. Heifer development: reproduction and nutrition. Veterinary Clinics of North America: Food Animal Practice 23, 53–68.Google ScholarPubMed
Laster, DB, Smith, GM, Cundiff, LV and Gregory, KE 1979. Characterization of biological types of cattle (Cycle II). II. Postweaning growth and puberty of heifers. Journal of Animal Science 48, 500–508.CrossRefGoogle ScholarPubMed
Le Cozler, Y, Lollivier, V, Lacasse, P and Disenhaus, C 2008. Rearing strategy and optimizing first-calving targets in dairy heifers: a review. Animal 2, 1393–1404.CrossRefGoogle ScholarPubMed
Lin, CY, Lee, AJ, McAllister, AJ, Batra, TR, Roy, GL, Vesely, JA, Wauthy, JM and Winter, KA 1987. Intercorrelations among milk production traits and body and udder measurements in Holstein heifers. Journal of Dairy Science 70, 2385–2393.CrossRefGoogle ScholarPubMed
Lombard, JE, Garry, FB, Tomlinson, SM and Garber, LP 2007. Impacts of dystocia on health and survival of dairy calves. Journal of Dairy Science 90, 1751–1760.CrossRefGoogle ScholarPubMed
Lynch, JM, Lamb, GC, Miller, BL, Brandt, RT, Cochran, RC and Minton, JE 1997. Influence of timing of gain on growth and reproductive performance of beef replacement heifers. Journal of Animal Science 75, 1715–1722.CrossRefGoogle ScholarPubMed
Macdonald, KA, Penno, JW, Bryant, AM and Roche, JR 2005. Effect of feeding level pre- and post-puberty and body weight at first calving on growth, milk production, and fertility in grazing dairy cows. Journal of Dairy Science 88, 3363–3375.CrossRefGoogle ScholarPubMed
Margerison, J and Downey, N 2005. Guidelines for optimal dairy heifer rearing and herd performance. In Calf and heifer rearing: principles of rearing the modern dairy heifer from calf to calving (ed. PC Garnsworthy), pp. 307–338. Nottingham University Press, Nottingham, UK.Google Scholar
Martin, LC, Brinks, JS, Bourdon, RM and Cundiff, LV 1992. Genetic effects on beef heifer puberty and subsequent reproduction. Journal of Animal Science 70, 4006–4017.CrossRefGoogle ScholarPubMed
McCullock, K, Hoag, DL, Parsons, J, Lacy, M, Seidel, GE and Wailes, W 2013. Factors affecting economics of using sexed semen in dairy cattle. Journal of Dairy Science 96, 6366–6377.CrossRefGoogle ScholarPubMed
McDaneld, TG, Kuehn, LA, Thomas, MG, Snelling, WM, Sonstegard, TS, Matukumalli, LK, Smith, TP, Pollak, EJ and Keele, JW 2012. Y are you not pregnant: identification of Y chromosome segments in female cattle with decreased reproductive efficiency. Journal of Animal Science 90, 2142–2151.CrossRefGoogle Scholar
Moallem, U, Werner, D, Lehrer, H, Zachut, M, Livshitz, L, Yakoby, S and Shamay, A 2010. Long-term effects of ad libitum whole milk prior to weaning and prepubertal protein supplementation on skeletal growth rate and first-lactation milk production. Journal of Dairy Science 93, 2639–2650.CrossRefGoogle ScholarPubMed
Mohd Nor, N, Steeneveld, W, van Werven, T, Mourits, MCM and Hogeveen, H 2013. First-calving age and first lactation milk production on Dutch dairy farms. Journal of Dairy Science 96, 981–992.CrossRefGoogle ScholarPubMed
Moriel, P, Cooke, RF, Bohnert, DW, Vendramini, JM and Arthington, JD 2012. Effects of energy supplementation frequency and forage quality on performance, reproductive, and physiological responses of replacement beef heifers. Journal of Animal Science 90, 2371–2380.CrossRefGoogle ScholarPubMed
Morris, CA and Cullen, NG 1994. A note on genetic correlations between pubertal traits of males and females and lifetime pregnancy rate in beef cattle. Livestock Production Science 39, 291–297.CrossRefGoogle Scholar
Morrison, SJ, Wicks, HCF, Carson, AF, Fallon, RJ, Twigge, J, Kilpatrick, DJ and Watson, S 2012. The effect of calf nutrition on the performance of dairy herd replacements. Animal 6, 909–919.CrossRefGoogle ScholarPubMed
Mourits, MCM, Dijkhuizen, AA, Huirne, RBM and Galligan, DT 1997. Technical and economic models to support heifer management decisions: basic concepts. Journal of Dairy Science 80, 1406–1415.CrossRefGoogle ScholarPubMed
Nelsen, TC, Short, RE, Phelps, DA and Staigmiller, RB 1985. Nonpuberal estrus and mature cow influences on growth and puberty in heifers. Journal of Animal Science 61, 470–473.CrossRefGoogle ScholarPubMed
Nilforooshan, MA and Edriss, MA 2004. Effect of age at first calving on some productivity and longevity traits in Iranian Holsteins of the Isfahan province. Journal of Dairy Science 87, 2130–2135.CrossRefGoogle ScholarPubMed
National Research Council 2001. Nutrient requirements of dairy cattle: 7th revised edition. The National Academies Press, Washington, DC.Google Scholar
Ojango, JMK and Pollott, GE 2001. Genetics of milk yield and fertility traits in Holstein-Friesian cattle on large-scale Kenyan farms. Journal of Animal Science 79, 1742–1750.CrossRefGoogle ScholarPubMed
Owens, FN, Dubeski, P and Hanson, CF 1993. Factors that alter the growth and development of ruminants. Journal of Animal Science 71, 3138–3150.CrossRefGoogle ScholarPubMed
Patterson, DJ, Perry, RC, Kiracofe, GH, Bellows, RA, Staigmiller, RB and Corah, LR 1992. Management considerations in heifer development and puberty. Journal of Animal Science 70, 4018–4035.CrossRefGoogle ScholarPubMed
Perry, GA 2012. Harnessing basic knowledge of factors controlling puberty to improve synchronization of estrus and fertility in heifers. Journal of Animal Science 90, 1172–1182.CrossRefGoogle ScholarPubMed
Pirlo, G, Miglior, F and Speroni, M 2000. Effect of age at first calving on production traits and on difference between milk yield returns and rearing costs in Italian Holsteins. Journal of Dairy Science 83, 603–608.CrossRefGoogle ScholarPubMed
Pursley, JR, Wiltbank, MC, Stevenson, JS, Ottobre, JS, Garverick, HA and Anderson, LL 1997. Pregnancy rates per artificial insemination for cows and heifers inseminated at a synchronized ovulation or synchronized estrus. Journal of Dairy Science 80, 295–300.CrossRefGoogle ScholarPubMed
Rae, DO, Ramsay, KH and Morrison, RL 2002. Effect of chlortetracycline in a trace mineral salt mix on fertility traits in beef cattle females in Florida. Journal of Animal Science 80, 880–885.CrossRefGoogle Scholar
Raeth-Knight, M, Chester-Jones, H, Hayes, S, Linn, J, Larson, R, Ziegler, D, Ziegler, B and Broadwater, N 2009. Impact of conventional or intensive milk replacer programs on Holstein heifer performance through six months of age and during first lactation. Journal of Dairy Science 92, 799–809.CrossRefGoogle ScholarPubMed
Randel, RD and Welsh, TH 2013. Joint Alpharma-Beef Species Symposium: interactions of feed efficiency with beef heifer reproductive development. Journal of Animal Science 91, 1323–1328.CrossRefGoogle ScholarPubMed
Rawlings, NC, Evans, AC, Honaramooz, A and Bartlewski, PM 2003. Antral follicle growth and endocrine changes in prepubertal cattle, sheep and goats. Animal Reproduction Science 78, 259–270.CrossRefGoogle ScholarPubMed
Richardson, H 2011. What age is the right age? The Journal for Holstein UK and British Friesian Breeders August 42–44.Google Scholar
Rogers, PL, Gaskins, CT, Johnson, KA and MacNeil, MD 2004. Evaluating longevity of composite beef females using survival analysis techniques. Journal of Animal Science 82, 860–866.CrossRefGoogle ScholarPubMed
Rooke, JA, Ainslie, A, Watt, RG, Alink, FM, McEvoy, TG, Sinclair, KD, Garnsworthy, PC and Webb, R 2009. Dietary carbohydrates and amino acids influence oocyte quality in dairy heifers. Reproduction Fertility and Development 21, 419–427.CrossRefGoogle ScholarPubMed
Sakaguchi, M, Suzuki, T, Sasamoto, Y, Takahashi, Y, Nishiura, A and Aoki, M 2005. Effects of first breeding age on the production and reproduction of Holstein heifers up to the third lactation. Animal Science Journal 76, 419–426.CrossRefGoogle Scholar
Serjsen, K 2005. Mammary development and milk yield potential. In Calf and heifer rearing: principles of rearing the modern dairy heifer from calf to calving (ed. PC Garnsworthy), pp. 237–252. Nottingham University Press, Nottingham, UK.Google Scholar
Serjsen, K and Purup, S 1997. Influence of prepubertal feeding level on milk yield potential of dairy heifers: a review. Journal of Animal Science 75, 828–835.Google Scholar
Shamay, A, Werner, D, Moallem, U, Barash, H and Bruckental, I 2005. Effect of nursing management and skeletal size at weaning on puberty, skeletal growth rate, and milk production during first lactation of dairy heifers. Journal of Dairy Science 88, 1460–1469.CrossRefGoogle ScholarPubMed
Simerl, NA, Wilcox, CJ and Thatcher, WW 1992. Postpartum performance of dairy heifers freshening at young ages. Journal of Dairy Science 75, 590–595.CrossRefGoogle ScholarPubMed
Simerl, NA, Wilcox, CJ, Thatcher, WW and Martin, FG 1991. Prepartum and peripartum reproductive performance of dairy heifers freshening at young ages. Journal of Dairy Science 74, 1724–1729.CrossRefGoogle ScholarPubMed
Soberon, F, Raffrenato, E, Everett, RW and Van Amburgh, ME 2012. Preweaning milk replacer intake and effects on long-term productivity of dairy calves. Journal of Dairy Science 95, 783–793.CrossRefGoogle ScholarPubMed
Snelling, WM, Cushman, RA, Fortes, MR, Reverter, A, Bennett, GL, Keele, JW, Kuehn, LA, McDaneld, TG, Thallman, RM and Thomas, MG 2012. How single nucleotide polymorphism chips will advance our knowledge of factors controlling puberty and aid in selecting replacement beef females. Journal of Animal Science 90, 1152–1165.CrossRefGoogle ScholarPubMed
Stevenson, JS, Smith, JF and Hawkins, DE 2000. Reproductive outcomes for dairy heifers treated with combination of prostaglandin F2α, norgestomet, and gonadotropin-releasing hormone. Journal of Dairy Science 83, 2008–2015.CrossRefGoogle ScholarPubMed
Stevenson, JS, Smith, MW, Jaeger, JR, Corah, LR and LeFever, DG 1996. Detection of estrus by visual observation and radiotelemetry in peripubertal, estrus-synchronized beef heifers. Journal of Animal Science 74, 729–735.CrossRefGoogle ScholarPubMed
Svensson, C and Hultgren, J 2008. Associations between housing, management, and morbidity during rearing and subsequent first-lactation milk production of dairy cows in southwest Sweden. Journal of Dairy Science 91, 1510–1518.CrossRefGoogle ScholarPubMed
Taylor, VJ 2001. The growth hormone (GH) and insulin-like growth factor axis in relation to fertility in high yielding dairy cows. PhD Thesis, University of London, London, UK.Google Scholar
Tsuruta, S, Misztal, I and Lawlor, TJ 2005. Changing definition of productive life in US Holsteins: effect on genetic correlations. Journal of Dairy Science 88, 1156–1165.CrossRefGoogle ScholarPubMed
Van Amburgh, M and Drackley, J 2005. Current perspectives on the energy and protein requirements of the pre-weaned calf. In Calf and heifer rearing: principles of rearing the modern dairy heifer from calf to calving (ed. PC Garnsworthy), pp. 67–82. Nottingham University Press, Nottingham, UK.Google Scholar
Van Amburgh, ME, Soberon, F, Karzses, J and Everett, RW 2011. Taking the long view: treat them nice as babies and they will be better adults. Proceedings of the Western Dairy Management Conference, Reno, pp. 141-156. Retrieved October 1, 2013, from www.wdmc.org/2011/2011%20Proceedings-Complete.pdf Google Scholar
Van Amburgh, ME, Galton, DM, Bauman, DE, Everett, RW, Fox, DG, Chase, LE and Erb, HN 1998. Effects of three prepubertal body growth rates on performance of Holstein heifers during first lactation. Journal of Dairy Science 81, 527–538.CrossRefGoogle ScholarPubMed
Velazquez, MA, Spicer, LJ and Wathes, DC 2008. The role of endocrine insulin-like growth factor-I (IGF-I) in female bovine reproduction. Domestic Animal Endocrinology 35, 325–342.CrossRefGoogle ScholarPubMed
Vukasinovic, N, Moll, J and Casanova, L 2001. Implementation of a routine genetic evaluation for longevity based on survival analysis techniques in dairy cattle populations in Switzerland. Journal of Dairy Science 84, 2073–2080.CrossRefGoogle ScholarPubMed
Wathes, DC, Brickell, JS, Bourne, N, Swali, A and Cheng, Z 2008. Factors influencing heifer survival and fertility on commercial dairy farms. Animal 2, 1135–1143.CrossRefGoogle ScholarPubMed
Wood-Follis, SL, Kojima, FN, Lucy, MC, Smith, MF and Patterson, DJ 2004. Estrus synchronization in beef heifers with progestin-based protocols. I. Differences in response based on pubertal status at the initiation of treatment. Theriogenology 62, 1518–1528.CrossRefGoogle ScholarPubMed
Wu, J, Brickell, JS, Yang, LG, Cheng, Z, Zhao, HQ, Wathes, DC and Zhang, SJ 2012. Reproductive performance and survival of Chinese Holstein dairy cows. Animal Production Science 52, 11–19.CrossRefGoogle Scholar
Yilmaz, A, Davis, ME and Simmen, RC 2006. Analysis of female reproductive traits in Angus beef cattle divergently selected for blood serum insulin-like growth factor I concentration. Theriogenology 65, 1180–1190.CrossRefGoogle ScholarPubMed
Zieba, DA, Amstalden, M and Williams, GL 2005. Regulatory roles of leptin in reproduction and metabolism: a comparative review. Domestic Animal Endocrinology 29, 166–185.CrossRefGoogle ScholarPubMed