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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
07/04/2005 |
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Data da última atualização: |
13/04/2022 |
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Autoria: |
LEWIS, R. M.; EMMANS, G. C.; DINGWALL, W. S.; SIMM, G. |
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Título: |
A description of the growth of sheep and its genetic analysis. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Animal Science, v. 74, pt 1, p. 51-62, 2002. |
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Idioma: |
Inglês |
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Conteúdo: |
The Gompertz is one of a family of growth functions that, when the environment (e.g.food, housing) is non- limiting, provides a useful description of growth as a comparatively simple, single equation. lt has three parameters of which the important ones are mature size, A, and the rate parameter, B. Estimates of A and B, however, are highly correlated and defining their separate values for individual animals is problematic. This problem was explored using five methods for estimating the parameters, or transformations of them, to describe the growth of two genotypes of Suffolk sheep kept under non-limiting conditions. One genotype was under selection for high lean growth rate and the other was its control. Live weights that were collected at least fortnightly from near birth to 150 days of age over a 9-year period on 1934 lambs were used. The Gompertz form adequately described the growth of the great majority of the lambs evaluated. When considering A and B as a lumped parameter, Z = A.B, and fitting Z, B and an initial condition (a transformed birth weight) as the parameters, the problems in estimation were substantially overcome as shown by a low correlation of Z with estimates of B both within and across animais. Usefully Z has a biological interpretation in that Z\e is the maximum daily growth rate. Since the Gompertz form adequately described growth in these sheep, the extent of genetic co-variation for the growth parameters values (A, B, Z) was estimated to determine if they were amenable to selection. A weighted univariate animal model was fitted. Mature size, A, and the rate parameter, B, were moderately heritable (0.37 (s.e. 0.04) and 0.38 (s.e. 0.05), respectively) as was live weight at 150 days of age (0.31 (s.e.0.06)). However there was a substantial negative genetic relationship between A and B (-0.48). Z was highly heritable (0.72 (s.e. 0.05)). After 9 years of selection, the genotype selected for high lean growth rate was heavier (P < 0.001) at 150 days of age (5.2 kg) and at maturity (6.6kg), with a maximum growth raie (Z\e) that was 1.12 times that of the control. Our lumped parameter Z, in effect a rate parameter scaled for mature size, avoided problems in estimating A and B and, in so doing, offers a general and robust description of lamb growth amenable to selection. MenosThe Gompertz is one of a family of growth functions that, when the environment (e.g.food, housing) is non- limiting, provides a useful description of growth as a comparatively simple, single equation. lt has three parameters of which the important ones are mature size, A, and the rate parameter, B. Estimates of A and B, however, are highly correlated and defining their separate values for individual animals is problematic. This problem was explored using five methods for estimating the parameters, or transformations of them, to describe the growth of two genotypes of Suffolk sheep kept under non-limiting conditions. One genotype was under selection for high lean growth rate and the other was its control. Live weights that were collected at least fortnightly from near birth to 150 days of age over a 9-year period on 1934 lambs were used. The Gompertz form adequately described the growth of the great majority of the lambs evaluated. When considering A and B as a lumped parameter, Z = A.B, and fitting Z, B and an initial condition (a transformed birth weight) as the parameters, the problems in estimation were substantially overcome as shown by a low correlation of Z with estimates of B both within and across animais. Usefully Z has a biological interpretation in that Z\e is the maximum daily growth rate. Since the Gompertz form adequately described growth in these sheep, the extent of genetic co-variation for the growth parameters values (A, B, Z) was estimated to determine if ... Mostrar Tudo |
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Palavras-Chave: |
Função Gompeets; Genetic parameters; Gompertz function; Melhoramento genético. |
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Thesagro: |
Crescimento; Genética Animal; Ovino; Parâmetro Genético. |
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Thesaurus Nal: |
Animal genetics; Growth factors; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
06/11/2007 |
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Data da última atualização: |
01/08/2018 |
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Autoria: |
FRANCISCATO, C.; LOPES, S. T. dos A.; VEIGA, A. P. M.; MARTINS, D. B.; EMANUELLI, M. P.; OLIVEIRA, L. S. S. |
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Afiliação: |
Carina Franciscato, Universidade Federal de Santa Maria - UFSM/Centro de Ciências Rurais/Hospital de Clínicas Veterinárias/Departamento de Clínica de Pequenos Animais; Sonia Terezinha dos Anjos Lopes, Universidade Federal de Santa Maria - UFSM/Centro de Ciências Rurais/Hospital de Clínicas Veterinárias/Departamento de Clínica de Pequenos Animais; Ângela Patrícia Medeiros Veiga, Universidade Federal do Rio Grande do Sul - UFRGS/Faculdade de Veterinária; Danieli Brolo Martins, Universidade Federal de Santa Maria - UFSM/Centro de Ciências Rurais/Hospital de Clínicas Veterinárias/Departamento de Clínica de Pequenos Animais; Mauren Picada Emanuelli, Universidade Federal de Santa Maria - UFSM/Centro de Ciências Rurais/Hospital de Clínicas Veterinárias/Departamento de Clínica de Pequenos Animais; Luiz Sergio Segala Oliveira, Universidade Federal de Santa Maria - UFSM/Centro de Ciências Rurais/Hospital de Clínicas Veterinárias/Departamento de Clínica de Pequenos Animais. |
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Título: |
Atividade sérica das enzimas AST, CK e GGT em cavalos Crioulos. |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF, v. 41, n. 10, p. 1561-1565, out. 2006 |
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Idioma: |
Português |
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Notas: |
Título em inglês: AST, CK and GGT enzymes serum activities in Crioulo horses. |
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Conteúdo: |
O objetivo deste trabalho foi verificar a influência da idade, sexo, manejo e estado gestacional sobre a atividade sérica das enzimas: aspartato aminotransferase (AST), creatina quinase (CK) e gama-glutamiltransferase (GGT) em cavalos da raça Crioula. Foram utilizados 142 eqüinos, divididos em seis grupos: potros até um ano de idade; cavalos adultos em regime de atividade livre; cavalos adultos em treinamento; machos adultos; fêmeas não gestantes; fêmeas gestantes. O valor da CK foi mais elevado em animais adultos do que em potros, o mesmo tendo ocorrido em animais em atividade livre, comparados a animais em treinamento. Fêmeas não gestantes apresentaram valores das enzimas CK e GGT maiores que os machos; o valor da CK em fêmeas gestantes foi mais elevado do que em fêmeas não gestantes. A idade, o sexo, o manejo e o estado gestacional influenciam a atividade sérica da CK, e o sexo influencia a atividade sérica da GGT. |
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Palavras-Chave: |
bioquímica sérica; doenças hepáticas; enzimas musculares; hepatic disease; muscular enzyme; myopathy; serum biochemistry. |
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Thesagro: |
Miopatia. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/107023/1/Atividade.pdf
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Marc: |
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Registro original: |
Embrapa Unidades Centrais (AI-SEDE) |
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