Short communication: Genetic parameters for post-weaning visual scores and reproductive traits in Suffolk sheep
Abstract
The aim of this study was to estimate the coefficients of heritability and genetic correlations among visual scores (conformation, CPW; precocity, PPW; musculature, MPW) and reproductive traits: age at first lambing (AFL) and scrotal circumference (SC) evaluated at 180 days of age in Suffolk lambs. In the statistical model only the additive genetic effect was considered as random effect. The heritability estimates by univariate analyses for CPW, PPW, MPW, AFL and SC were 0.08, 0.12, 0.09, 0.20 and 0.22, respectively. The genetic correlations among AFL and CPW, PPW, MPW were -0.26, 0.19, and 0.08, respectively. The genetic correlation among SC and CPW, PPW, MPW were, respectively, 0.54, 0.88 and 0.86, and between AFL and SC was 0.26. The direct selection for conformation, precocity and musculature at 180 days of age and age at first lambing will provide slow genetic progress due to low heritability estimates. It is possible to obtain genetic gain in sexual precocity through selection on scrotal circumference in Suffolk rams. The favorable genetic correlation among visual scores and SC and between CPW and AFL, indicated the possibility to gain in genetic progress for reproductive traits through indirect selection of the visual scores in Suffolk sheep.
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References
Abbasi M, Ghafouri-Kesbi F, 2011. Genetic (co)variance components for body weight and body measurements in Makooei sheep. As-Aust J Anim Sci 24: 739-743.
Al-Shorepy SA, Notter DR, 1996. Genetic variation and covariation for ewe reproduction, lamb growth and lamb scrotal circumference in a fall-lambing sheep flock. J Anim Sci 74: 1490-1498. https://doi.org/10.2527/1996.7471490x
Boligon AA, Albuquerque LG, 2010. Correlações genéticas entre escores visuais e características reprodutivas em bovinos Nelore usando inferência bayesiana. Pesqu Agrop Bras 45: 1412-1418. https://doi.org/10.1590/S0100-204X2010001200011
Boligon AA, Albuquerque LG, Rorato PRN, 2008. Associações genéticas entre pesos e características reprodutivas em rebanhos da raça Nelore. Revista Brasileira de Zootecnia 37: 596-601. https://doi.org/10.1590/S1516-35982008000400002
Faria CU, Magnabosco CU, Albuquerque LG, Bezerra LAF, Lôbo RB, 2009. Avaliação genética de características de escores visuais de bovinos da raça Nelore da desmama até a maturidade. Revista Brasileira de Zootecnia 38: 1191-1200. https://doi.org/10.1590/S1516-35982009000700005
Fossceco SL, Notter DR, 1995. Heritabilities and genetic correlations of body weight, testis growth and ewe lamb reproductive traits in crossbred sheep. J Anim Sci 60: 185-195. https://doi.org/10.1017/S135772980000833X
Janssens S, Vandepitte W, 2004. Genetic parameters for body measurements and linear type traits in Belgian Bleu du Maine, Suffolk and Texel sheep. Small Rumin Res 54: 13-24. https://doi.org/10.1016/j.smallrumres.2003.10.008
Kern G, Kemper N, Traulsen I, Henze C, Stamer E, Krieter J, 2010. Analysis of different effects on longevity in four sheep breeds of northern Germany. Small Rumin Res 90: 71-74. https://doi.org/10.1016/j.smallrumres.2010.01.005
Kippert CJ, Rorato PRN, Campos LT et al, 2006. Efeito de fatores ambientais sobre escores de avaliação visual à desmama e estimativa de parâmetros genéticos, para bezerros da raça Charolês. Ciência Rural 36: 579-585. https://doi.org/10.1590/S0103-84782006000200034
Maniatis N, Pollott GE, 2003. The impact of data structure on genetic (co)variance components of early growth in sheep, estimated using an animal model with maternal effects. J Anim Sci 81: 101-108. https://doi.org/10.2527/2003.811101x
Martínez-Velázquez G, Gregory KE, Bennett GL, Van Vleck LD, 2003. Genetic relationships between scrotal circumference and female reproductive traits in cattle. J Anim Sci 81 (2): 395-401. https://doi.org/10.2527/2003.812395x
Matos CA, Thomas DL, Nash TG, Waldron DF, Stookey JM, 1992. Genetic analyses of scrotal circumference size and growth in Rambouillet lambs. J Anim Sci 70: 43-50. https://doi.org/10.2527/1992.70143x
Mekkawy W, Roehe R, Lewis RM, Davies MH, Bunger L, Simm G, Haresign W, 2009. Genetic relationship between longevity and objectively or subjectively assessed performance traits in sheep using linear censored models. J Anim Sci 87: 3482-3489. https://doi.org/10.2527/jas.2008-1398
Meyer K, 2007. WOMBAT—A tool for mixed model analyses in quantitative genetics by restricted maximum likelihood (REML). J Zhejiang Univ Sci B 8: 815-821. https://doi.org/10.1631/jzus.2007.B0815
Mokhtari MS, Rashidi A, Esmailizadeh AK, 2010. Estimates of phenotypic and genetic parameters for reproductive traits in Kermani sheep. Small Rumin Res 88: 27-31. https://doi.org/10.1016/j.smallrumres.2009.11.004
Montoya AMA, 2010. Estudio de características reproductivas en un rebanõ comercial de ovejas pelibuey en Campeche México. Thesis de Maestria en Ciencias, Colegio de Posgraduados. Montecillo, Estado de México, México.
Notter DR, 2000. Effects of ewe age and season of lambing on prolificacy in US Targhee, Suffolk, and Polypay sheep. Small Rumin Res 38: 1-7. https://doi.org/10.1016/S0921-4488(00)00144-9
Qureshi MA, Babar ME, Ali A, 2010. Environmental and genetic factors influencing performance traits of Kajli sheep in Pakistan. Pak J Zool 42: 339-343.
Rosati A, Mousa E, Van Vleck LD, Young LD, 2002. Genetic parameters of reproductive traits in sheep. Small Rumin Res 43: 65-74. https://doi.org/10.1016/S0921-4488(01)00256-5
Short RY, Staimiller RB, Bellows RL, Greer RC, 1994. Breeding heifers at one year of age: biological and economic considerations. In: Factors affecting calf crop; Fields MJ & Sand RS (Eds), pp: 55-68. CRC Press, London.
Snowder GD, 2007. Genetic improvement of overall reproductive successin sheep: A review. Archivos Latinoamericanos de Producción Animal 16: 32-40.
Toe F, Rege JEO, Mukasa-Mugerwa E, Tembely S, Anindo D, Baker RL, Lahlou-Kassi A, 2000. Reproductive characteristics of Ethiopian highland sheep I. Genetic parameters of testicular measurements in ram lambs and relationship with age at puberty in ewe lambs. Small Rumin Res 36: 227-240. https://doi.org/10.1016/S0921-4488(99)00117-0
Vanimisetti HB, Notter DR, 2012. Opportunities for genetic evaluation of reproductive performance in accelerated lambing systems. Livestock Sci 148: 134-145. https://doi.org/10.1016/j.livsci.2012.05.022
Zishiri OT, Cloete SWP, Olivier JJ, Dzama K, 2013. Genetic parameters for growth, reproduction and fitness traits in the South African Dorper sheep breed. Small Rumin Res 112: 39-48. https://doi.org/10.1016/j.smallrumres.2013.01.004
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