Dairy cattle industry and genetic improvement programs in Thailand
Santi Pangmao A C , Peter C. Thomson B and Mehar S. Khatkar A CA Sydney School of Veterinary Science, The University of Sydney, 425 Werombi Road, Camden, NSW 2570, Australia.
B School of Life and Environmental Sciences, The University of Sydney, 425 Werombi Road, Camden, NSW 2570, Australia.
C Corresponding author. Email: santi.pangmao@sydney.edu.au; mehar.khatkar@sydney.edu.au
Animal Production Science 57(7) 1242-1247 https://doi.org/10.1071/AN16454
Submitted: 15 July 2016 Accepted: 12 April 2017 Published: 22 May 2017
Abstract
The objective of the present study was to estimate genetic parameters and evaluate the genetic trends of 100-day milk yield (MY), fat percentage (FP) and protein percentage (PP) in three government dairy cattle farms in Thailand, located in the north and north-east of the country. The data consisted of records from 1745 first-lactation cows that calved between 1986 and 2015, which were the progeny of 287 sires and 1237 dams. Most of the animals were crossbred Holstein-Friesian with native or zebu animals. The total number of animals in the pedigree was 4753. Univariate and bivariate linear mixed models were used to estimate genetic parameters and breeding values by using ASReml-R. The fixed effects in the model were herd, year of calving, season of calving, breed group and the interaction between year and season of calving, and the random effects were animal and residual. All fixed effects had significant effects on the three traits, except breed group. The estimated heritabilities for MY, FP and PP were 0.242 ± 0.061, 0.066 ± 0.048 and 0.329 ± 0.072 respectively. The genetic correlation for MY and FP, MY and PP, and FP and PP were 0.219 ± 0.352, –0.271 ± 0.177 and 0.452 ± 0.255 respectively. The genetic trends based on estimated breeding values over year of birth did not show consistent improvement in all three traits, although there was a slight declining trend in MY in the later years.
Additional keywords: genetic evaluation, tropical agriculture.
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