A. Menéndez-Buxadera, F. Romero, O. González, F. Arrebola, A. Molina
Issue:
104-2 (127-132)
Topic:
Animal Production
Keywords:
Dairy goats, Test day, Variance components
Summary:
A total of 94469 test day records of milk yield and milk composition (fat, protein and dry matter
contents) from 9271 Payoya goats, collected between November 2002 to December 2007 were
analyzed using random regression models to estimate the parameter genetic for these traits. A third
order equation for genetic and environment permanent effects, with a heterogeneous residual
variance model was the best fit model. For all the traits analyzed results show an increase trend in
the heritability values through lactation curve, except for milk yield. This shows the highest values in
the middle of lactation. Heritabilities ranged from 0.14 to 0.23 for milk yield, from 0.33 to 0.40% for
protein content; 0.10 to 0.20 for fat %, 0.26 to 0.40 for lactose % and finally from 0.12 to 0.29 for
dry matter. Genetic correlations were positive and high between adjacent records in all traits. There
was a wide genetic variability in the shape of the lactation curve.
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