Abstract
This study aimed to investigate the following environmental effects in Suffolk lambing: contemporary groups, type of birth, and age of animal and age of dam at lambing on conformation (C), precocity (P), musculature (M), and body weight at postweaning (W), and the heritability coefficients and genetic correlations among these traits. Contemporary groups, type of birth, and age of animal and age of dam at lambing were significant for W. For C, all the effects studied were significant, except linear and quadratic effects of age of the animal. For P, all effects studied were significant, except the quadratic effect of age of the animal. For M, the effects of contemporary group, type of birth, and the linear effect of the age of the animal were significant. Heritability estimates were 0.07 ± 0.03, 0.14 ± 0.03, 0.09 ± 0.03, and 0.11 ± 0.03 for C, P, M, and W, respectively, indicating a positive low response for direct selection. Estimates of genetic correlations among the visual scores (C, P, and M) and W were moderate to highly favorable and positive, ranging from 0.48 to 0.90. These results indicate that selection for visual scores will increase body weight.
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Bahreini Behzadi, M. R., Shahroudi, F. E., Van Vleck, L. D. (2007). Estimates of genetic parameters for growth traits in Kermani sheep. Journal of Animal Breeding and Genetics 124, 296–301.
Boldman, K.G., Kriese, L.A., Van Vleck, L.D. (1995). A manual for use of MTDFREML. USDA-ARS. Clay Center, NE. 120p.
Boligon, A. A., Mercadante, M. E. Z., Albuquerque, L. G. (2011). Genetic associations of conformation, finishing precocity and muscling visual scores with mature weight in Nelore cattle. Livestock Science 135, 238–243.
Boujenane, I., Bradford, G. E., Berger, Y. M., Chikhi, A. (1991). Genetic and environmental effects on growth to one year and viability of lambs from a crossbreeding study of D’man and Sardi breeds. Journal of Animal Science 69, 3989–3998.
Cardoso, F. F., Cardellino, R. A., Campos, L.T. (2004). Componentes de (co)variância e parâmetros genéticos de caracteres pós-desmama em bovinos da raça Angus. Revista Brasileira de Zootecnia 33, 313–319.
Carolino, N., Gama, L., Dinis, R., de Sá, T. (2003). Características produtivas da ovelha Serra da Estrela. Archivos de Zootecnia 52, 3–14.
Dal-Farra, R. A., Roso, V. M., Schenkel, F. S. (2002). Efeitos de ambiente e de heterose sobre o ganho de peso do nascimento ao desmame e sobre os escores visuais ao desmame em bovinos de corte. Revista Brasileira de Zootecnia 31, 1350–1361.
Fernandes, A. A. O., Buchanan, D. Selaive-Villarroel, A. B. (2001). Avaliação dos fatores ambientais no desenvolvimento corporal de cordeiros deslanados da raça Morada Nova. Revista Brasileira de Zootecnia 30, 1460–1465.
Forni, S., Federici, J.F., Albuquerque, L.G. (2007). Tendências genéticas para escores visuais de conformação, precocidade e musculatura à desmama de bovinos Nelore. Revista Brasileira de Zootecnia 36, 572–577.
Hogg, R. V., Craig, A. T. (1995). Introduction to mathematical statistics. 5 ed. New Jersey, Prentice Hall, 564 p.
Hohenboken, W. D., Kennick, W. H., Bogart, R. (1976). Genetic, environmental and interaction effects in sheep II. Lamb growth and carcass merit. Journal of Animal Science 42, 307–316.
Jorge Júnior, J., Pita, F. V. C., Fries, L. A., Albuquerque, L. G. (2001). Influência de alguns fatores de ambiente sobre os escores de conformação, precocidade e musculatura à desmama em um rebanho da raça Nelore. Revista Brasileira de Zootecnia 30, 1697–1703.
Kippert, C. J., Rorato, P. R. N., Campos, L. T., Boligon A. A., Weber, T., Gheller, D. G., Lopes, J. S. (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.
Koch, R. M. (1978). Selection in beef cattle. III. Correlated response os carcass traits to selection for weaning weight, yearling weight and muscling score in clatter. Journal of Animal Science 47, 142–150.
Koury Filho, W. (2005). Escores visuais e suas relações com características de crescimento em bovinos de corte. PhD Thesis. Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal.
Martins, E. C., Guimarães, V. P., Bomfim, M. A. D. (2009). Terminação de cordeiros em confinamento: avaliação dos impactos econômicos, sociais e ambientais. Comunicado Técnico 109, Embrapa.
Sarmento, J. L. R., Torres, R. A., Sousa, W. H., Pereira, C. S., Lopes, P. S., Breda, F. C. (2006). Estimação de parâmetros genéticos para características de crescimento de ovinos Santa Inês utilizando modelos uni e multicaracterísticas. Arquivo Brasileiro de Medicina Veterinária e Zootecnia 58, 581–589.
SAS Institute Inc. (2011). SAS/STAT 9.3 User’s Guide. Cary, NC: SAS Institute Inc.
Somavilla, A.L., Dias, L. T., Teixeira, R. A. (2012). Environmental and genetic effects on conformation, precocity and musculature traits at weaning in Suffolk lambs. Small Ruminants Research 102, 131–134.
Toral, F. L. B., Roso, V. M., Araújo, C. V., Reis Filho, J. C. (2011). Genetic parameters and response to selection for post-weaning weight gain, visual scores and carcass traits in Hereford and Hereford x Nellore cattle. Livestock Science 137, 231–237.
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Nascimento, B.M., Somavilla, A.L., Dias, L.T. et al. Environmental and genetic effects on weight and visual score traits at postweaning in Suffolk sheep. Trop Anim Health Prod 46, 1265–1269 (2014). https://doi.org/10.1007/s11250-014-0638-x
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DOI: https://doi.org/10.1007/s11250-014-0638-x