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Biblioteca(s):  Embrapa Caprinos e Ovinos.
Data corrente:  07/04/2005
Data da última atualização:  13/04/2022
Autoria:  LEWIS, R. M.; EMMANS, G. C.; DINGWALL, W. S.; SIMM, G.
Título:  A description of the growth of sheep and its genetic analysis.
Ano de publicação:  2002
Fonte/Imprenta:  Animal Science, v. 74, pt 1, p. 51-62, 2002.
Idioma:  Inglês
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 ... Mostrar Tudo
Palavras-Chave:  Função Gompeets; Genetic parameters; Gompertz function; Melhoramento genético.
Thesagro:  Crescimento; Genética Animal; Ovino; Parâmetro Genético.
Thesaurus Nal:  Animal genetics; Growth factors; Sheep.
Categoria do assunto:  L Ciência Animal e Produtos de Origem Animal
Marc:  Mostrar Marc Completo
Registro original:  Embrapa Caprinos e Ovinos (CNPC)
Biblioteca ID Origem Tipo/Formato Classificação Cutter Registro Volume Status URL
CNPC17628 - 1ADDAP - PPv.74,p.51
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