Abstract

The aim of this study was to estimate genetic and phenotypic parameters of Milk Yield (MY) of Saanen goats from a herd in Andradas city - MG, in Southeast region of Brazil.(Co)variance components and genetic and phenotypic parameters were estimated by Restricted Maximum Likelihood (REML), by an Animal Model. Heritability estimate of MY was 0.09 and repeatability was 0.20. Genetic trend of MY was obtained by the regression of breeding values of the goats on kidding year, with the first derivative of regression function representing genetic trend and the second derivative indicating annual change in MY. Genetic trend obtained was a quadratic regression and can be expressed by the equation YpL=0.3654x2-62.7726x+2693.3575, with minimum point in the year 1986 and determination coefficient (R2) equal to 0.70. There was a annual genetic gain of 0.7308 kg. The heritability and repeatability estimates were low and the trait can only be measured on females, so it could be recommended the Progeny Test as a method of sires evaluation. In addition more than one record per animal should be taken before the culling decision. 

A. C Ribeiro, S. A Queiroz, J. F Lui, S. DA Ribeiro, K. T Resende

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 24: Sheep and goats (fibre); sheep and goats (meat and milk); poultry; horses; buffaloes., , 234–237, 1998
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