Powered by OpenAIRE graph
Found an issue? Give us feedback
image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Biblioteca Digital d...arrow_drop_down
image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
addClaim

Estimativa dos componentes de variância da produção de leite diária da cabra serrana (ecótipo transmontano)

Authors: Pereira, Francisco;

Estimativa dos componentes de variância da produção de leite diária da cabra serrana (ecótipo transmontano)

Abstract

O objectivo deste trabalho foi desenvolver um modelo para a avaliação genética, baseado na produção de leite diária, para os caprinos de raça Serrana - Ecótipo Transmontana. Foram utilizados 2934 registos de contrastes de produção de leite diário da primeira, segunda e terceira lactações. Os registos obtidos nos sete dias imediatamente a seguir ao parto e 200 dias após o parto foram removidos da análise. A produção de leite diária média foi de 0,855 ( 0,309) kg para o conjunto das três lactações, 0,787 ( 0,268) para a primeira lactação, 0,903 ( 0,309) para a segunda lactação e 0,931 ( 0,341) para a terceira lactação. O pedigree continha 1264 animais (31 bodes e 1233 cabras) e, destes, 488 eram animais base. O método REML, implementado no software VCE-5, foi utilizado para estimar os componentes de co-variância. Foram testados e comparados dois modelos, o Modelo 2.1 continha o tipo de parto, a ordem de lactação, a interacção entre o ano e a estação de parto e a interacção entre o ano e a estação de contraste como efeitos fixos, e os efeitos do rebanho e genético aditivo directo como efeitos aleatórios; o Modelo 2.2 foi melhorado incluindo o estádio de lactação (como classes de 30 dias de intervalo) como efeito fixo, e o efeito do ambiente permanente como efeito aleatório. As estimativas da heritabilidade foram de 0,32 para o Modelo 2.1 e 0,18 para o Modelo 2.2. O Modelo 2.2 mostrou-se bastante eficiente para prever os efeitos genético aditivo directo e do ambiente permanente que, numa primeira fase, poderá ser utilizado para a selecção dos reprodutores a incluir no programa de melhoramento. The objective of this study was to develop a model, based on the test-day milk records, for the genetic evaluation for the breed Serrana - Ecótipo Transmontana dairy goats. Data comprising 2934 test-day records from the first, second and third lactations of 629 goats were used in analysis of daily milk yield (DMY). Records before 7 and after 200 days in milk were discharged. Average daily milk yield was 0,855 ( 0,309) kg for all lactations, 0,787 ( 0,268) for the first lactation, 0,903 ( 0,309) for the second lactation, and 0,931 ( 0,341) for the third lactation. The pedigree file contained 1264 animals (31 bucks and 1233 goats), and 488 animals were base animals. The REML method, as implemented in the VCE-5 programme, was applied for the estimation of (co)variance components of two models. Two models were tested, Model 2.1 contained parity type, lactation number, interaction year with season of lambing, interaction of year and season of testing as fixed effects, and owner and direct additive genetic effects were treated as random. Model 2.2 was upgraded including the stage of lactation (as 30 days in milk class) as fixed effect, and permanent environment as random effect. The heritability estimates were 0,32 for Model 2.1 and 0,18 for Model 2.2. There is a potential for using Model 2.2 to predict the additive genetic and permanent environmental effects for the genetic evaluation of the Serrana goats.

Country
Portugal
Related Organizations
Keywords

Raça Serrana, Avaliação genética, Leite, Cabras, Heritabilidade

  • BIP!
    Impact byBIP!
    selected citations
    These citations are derived from selected sources.
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    0
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
Powered by OpenAIRE graph
Found an issue? Give us feedback
selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green