Genetic parameters estimation of milk yield in crossbred dairy goat by random regression testday model

Abstract

The objective of this study was to estimate genetic parameters in crossbred goat between Thai native with Anglo-Nubian (AN), Toggenburg (TG), Saanen (SA) and Alpine (AP), for milk yield base on random regression test day model (RRTDM). The data analysis was based on 1,438 test day milk records between 2004 and 2006. RRTDM based on second-order Legendre polynomial function for additive genetic and permanent environment effects. Residual variance was adjusted for heterogeneity using exponential function. Heritability estimates were 0.088-0.535 and decreased from the beginning to the end of lactation with average of 0.238. The genetic lactation curve obtained from this study is useful for increasing accuracy of breeding values and selection strategies for
improving milk goat of Thailand.