Estimation of genetic parameters and genetic trends of mastitis resistance in Thai dairy cows using test‐day records

Main Article Content

Sayan Buaban
Kiettisak Lengnudum
Monchai Duangjinda

Abstract

The aim of the present study was to estimate the genetic parameters and trends of mastitis resistance in the first three lactations of Thai dairy cows using a multiple-lactation random regression test-day model (ML-RR-TDM). Data set included 11,443 cows calving during 1999-2016 with 76,085, 23,602 and 10,320 test-day somatic cell counts in the first, second and third lactation, respectively, which were transformed to test-day somatic cell scores. The model was applied with random herd-test-month effect, fixed effect for breed-DIM, year-season and age of calving, random regressions for the additive genetic and permanent environmental effects. Average daily heritabilities of SCS increased with lactation number were in the range from 0.15 to 0.26 and genetic correlations between lactation were in the ranged from 0.73 to 0.92. This would suggest that although there was potential for genetic improvement in mastitis resistance of Thai dairy population, simultaneous improvement of the production environment was essential, and selection animal for SCS based on the first lactation could improve the response of mastitis resistance for later lactations.

Article Details

How to Cite
Buaban, S. ., Lengnudum, K. ., & Duangjinda, M. . (2020). Estimation of genetic parameters and genetic trends of mastitis resistance in Thai dairy cows using test‐day records. Khon Kaen Agriculture Journal, 48(1), 23–34. retrieved from https://li01.tci-thaijo.org/index.php/agkasetkaj/article/view/249858
Section
บทความวิจัย (research article)

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