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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
11/01/2000 |
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Data da última atualização: |
20/07/2011 |
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Autoria: |
MARIANTE, A. da S. |
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Afiliação: |
ARTHUR DA SILVA MARIANTE, EMBRAPA. Centro Nacional de Pesquisa de Gado de Corte (Campo Grande, MS). |
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Título: |
Growth and reproduction in nelore cattle in Brazil; genetic parameters and effects of environmental factors. |
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Ano de publicação: |
1978 |
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Fonte/Imprenta: |
Florida: University of Florida, 1978. |
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Páginas: |
130 f. |
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Idioma: |
Inglês |
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Notas: |
Tese (Doutorado) - University of Florida. |
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Conteúdo: |
The objectives of this study were to determine the effects of various genetic and environmental factors on growth traits and reproductive performance of a herd of Nellore cattle in central Brazil. Weights at birth and at weaning (8 mo.), 12, 18, and 24 months of age collected over a 15-year period from 2,282 calves, were analyzed by least squares methods. Least squares means for these weights were 30.2+-.7, 187.5+-.0, 215.5+-.3, 282.6+-2.8, and 354.9+-4.0 kg. Year amd month of birth, sire and sex of calf affected (P<.01) weights at all ages. Age of dam had a significant (P<.10) effect on calf weight at 24 monts of age, and a highly significant effect on weights at the other ages. Heritability, estimated by paternal halfsib correlations, was .62+-.14, .12+-.14, 14+-.05, .13+-.05, and .18+-.06 for weight at birth, 8, 12, 18 and months, respectively. All genetic, phenotypic and environmental correlations between weights at different ages were positive. Correlations between weights tahen at ages closer together tended to be higher than those taken at more distant ages. Data from 335 calvings collected over an 11-year period were analyzed for age at first calving by least squares methods. The least squares mean for age at first calving was 40.3+-.7 months. Variables that significantly affected this traid were weight of the cow at birth, and at 8, 12, 18, and 24 months of age (P<.05), and sire of calf (P<.01). Heritability of age at first calving, estimated by paternal half-sib correlations, was .09+-12. Genetic, phenotypic and environmental correlations between birth weight and age at first calving were.65, .18, and.39, respectively. The genetic correlations between each of the other four weights and age at first calving were all positive; however, the correlations decreased with increasing age. The phenotypic and environmental correlations between age at first calving and periodic weights of the cow to 24 months of age all were negative. Least squares mean for calving interval was 400.2+- 10,4 days. Variables that significantly affected this trait were year of parturition (P<.01), month of parturition (P<.05), sex of calf (P<.05), sire of cow (P<.10), and weight gain of previous calf to 3 months of age (P<.10). The heritability of calving interval was estimated by paternal halv-sib correlations and was. 06+- .05. The genetic correlations between calving interval and weights at birth, weaning and at 12, 18, and 24 months of age were, respectively, .77+-.31, .81+-.30, .60+-.37, and .37+- .37. The phenotypic correlations were small and positive. All environmental correlations were positive, with exception of that between weaning weight and calving interval. Genetic, phenotypic, and environmental correlations between age at firts calving and calving interval were, respectively, .44, .02, and -.09. MenosThe objectives of this study were to determine the effects of various genetic and environmental factors on growth traits and reproductive performance of a herd of Nellore cattle in central Brazil. Weights at birth and at weaning (8 mo.), 12, 18, and 24 months of age collected over a 15-year period from 2,282 calves, were analyzed by least squares methods. Least squares means for these weights were 30.2+-.7, 187.5+-.0, 215.5+-.3, 282.6+-2.8, and 354.9+-4.0 kg. Year amd month of birth, sire and sex of calf affected (P<.01) weights at all ages. Age of dam had a significant (P<.10) effect on calf weight at 24 monts of age, and a highly significant effect on weights at the other ages. Heritability, estimated by paternal halfsib correlations, was .62+-.14, .12+-.14, 14+-.05, .13+-.05, and .18+-.06 for weight at birth, 8, 12, 18 and months, respectively. All genetic, phenotypic and environmental correlations between weights at different ages were positive. Correlations between weights tahen at ages closer together tended to be higher than those taken at more distant ages. Data from 335 calvings collected over an 11-year period were analyzed for age at first calving by least squares methods. The least squares mean for age at first calving was 40.3+-.7 months. Variables that significantly affected this traid were weight of the cow at birth, and at 8, 12, 18, and 24 months of age (P<.05), and sire of calf (P<.01). Heritability of age at first calving, estimated by paternal half-sib co... Mostrar Tudo |
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Palavras-Chave: |
Growth trait. |
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Thesagro: |
Crescimento; Gado Nelore; Pecuária; Reprodução Animal; Zootecnia. |
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Thesaurus Nal: |
Brazil; cattle breeding; reproduction; reproductive performance. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 03593nam a2200253 a 4500
001 1322205
005 2011-07-20
008 1978 bl uuuu m 00u1 u #d
100 1 $aMARIANTE, A. da S.
245 $aGrowth and reproduction in nelore cattle in Brazil; genetic parameters and effects of environmental factors.
260 $aFlorida: University of Florida$c1978
300 $a130 f.
500 $aTese (Doutorado) - University of Florida.
520 $aThe objectives of this study were to determine the effects of various genetic and environmental factors on growth traits and reproductive performance of a herd of Nellore cattle in central Brazil. Weights at birth and at weaning (8 mo.), 12, 18, and 24 months of age collected over a 15-year period from 2,282 calves, were analyzed by least squares methods. Least squares means for these weights were 30.2+-.7, 187.5+-.0, 215.5+-.3, 282.6+-2.8, and 354.9+-4.0 kg. Year amd month of birth, sire and sex of calf affected (P<.01) weights at all ages. Age of dam had a significant (P<.10) effect on calf weight at 24 monts of age, and a highly significant effect on weights at the other ages. Heritability, estimated by paternal halfsib correlations, was .62+-.14, .12+-.14, 14+-.05, .13+-.05, and .18+-.06 for weight at birth, 8, 12, 18 and months, respectively. All genetic, phenotypic and environmental correlations between weights at different ages were positive. Correlations between weights tahen at ages closer together tended to be higher than those taken at more distant ages. Data from 335 calvings collected over an 11-year period were analyzed for age at first calving by least squares methods. The least squares mean for age at first calving was 40.3+-.7 months. Variables that significantly affected this traid were weight of the cow at birth, and at 8, 12, 18, and 24 months of age (P<.05), and sire of calf (P<.01). Heritability of age at first calving, estimated by paternal half-sib correlations, was .09+-12. Genetic, phenotypic and environmental correlations between birth weight and age at first calving were.65, .18, and.39, respectively. The genetic correlations between each of the other four weights and age at first calving were all positive; however, the correlations decreased with increasing age. The phenotypic and environmental correlations between age at first calving and periodic weights of the cow to 24 months of age all were negative. Least squares mean for calving interval was 400.2+- 10,4 days. Variables that significantly affected this trait were year of parturition (P<.01), month of parturition (P<.05), sex of calf (P<.05), sire of cow (P<.10), and weight gain of previous calf to 3 months of age (P<.10). The heritability of calving interval was estimated by paternal halv-sib correlations and was. 06+- .05. The genetic correlations between calving interval and weights at birth, weaning and at 12, 18, and 24 months of age were, respectively, .77+-.31, .81+-.30, .60+-.37, and .37+- .37. The phenotypic correlations were small and positive. All environmental correlations were positive, with exception of that between weaning weight and calving interval. Genetic, phenotypic, and environmental correlations between age at firts calving and calving interval were, respectively, .44, .02, and -.09.
650 $aBrazil
650 $acattle breeding
650 $areproduction
650 $areproductive performance
650 $aCrescimento
650 $aGado Nelore
650 $aPecuária
650 $aReprodução Animal
650 $aZootecnia
653 $aGrowth trait
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Embrapa Gado de Corte (CNPGC) |
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| 1. |  | AGATA, K.; ALASAAD, S.; ALMEIDA-VAL, V. M. F.; ÁLVAREZ-DIOS, J. A.; BARBISAN, F.; BEADELL, J. S.; BELTRÁN, J. F.; BENÍTEZ, M.; BINO, G.; BLEAY, C.; BLOOR, P.; BOHLMANN, J.; BOOTH, W.; BOSCARI, E.; CACCONE, A.; CAMPOS, T. de; CARVALHO, B. M.; CLIMACO, G. T.; CLOBERT, J.; CONGIU, L.; COWGER, C.; DIAS, G.; DOADRIO, I.; FARIAS, I. P.; FERRAND, N.; FREITAS, P. D.; FUSCO, G.; GALETTI, P. M.; GALLARDO-ESCÁRATE, C.; GAUNT, M. W.; OCAMPO, Z. G.; GONÇALVES, H.; GONZALEZ, E. G.; HAYE, P.; HONNAY, O.; HYSENI, C.; JACQUEMYN, H.; JOWERS, M. J.; KAKEZAWA, A.; KAWAGUCHI, E.; KEELING, C. I.; YE-SEUL, K.; LA SPINA, M.; WAN-OK, L.; LESNIEWSKA, M.; YANG, L.; HAIXIA, L.; XIAOLIN, L.; LOPES, S.; MARTÍNEZ, P.; MEEUS, S.; MURRAY, B. W.; NUNES, A. G.; OKEDI, L. M.; OUMA, J. O.; PARDO, B. G.; PARKS, R.; PAULA-SILVA, M. N.; PEDRAZA-LARA, C.; PERERA, O. P.; PINO-QUERIDO, A.; RICHARD, M.; ROSSINI, B. C.; SAMARASEKERA, N. G.; SÁNCHEZ, A.; SANCHEZ, J. A.; SANTOS C. H. dos A.; SHINOHARA, W.; SORIGUER, R. C.; SOUSA, A. C. B.; SOUSA, C. F. da S.; STEVENS, V. M.; TEJEDO, M.; VALENZUELA-BUSTAMANTE, M.; VLIET, M. S. V. de; VANDEPITTE, K.; VERA, M.; WANDELER, P.; WEIMIN, W.; YONG-JIN, W.; YAMASHIRO, A.; YAMASHIRO, T.; CHANGCHENG, Z. Permanent genetic resources added to molecular ecology. Resources database 1 December 2010-31 January 2011. Molecular Ecology Resources, Oxford, v. 11, n. 3, p. 935-936, May 2011.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 2 |
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