Estimation of Direct Genetic Effects on Milk Yield and Lactation Length in the Aownoi Dairy Cooperative

Authors

  • Mohammed Endris Afar Pastoral and Agro - Pastoral Research Institute, P.O. Box 16, Samara, Ethiopia.
  • Sornthep Tumwasorn Departments of Animal Science, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand.
  • Chaiwat Wongwan Aownoi Dairy Cooperative, Prachuap Khiri Khan 77210, Thailand.
  • Panwadee Sopannarath Departments of Animal Science, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand.
  • Somkiert Prasanpanich Departments of Animal Science, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand.

Keywords:

Direct genetic, milk yield, lactation length, Aownoi, Dairy Cooperative

Abstract

This study aimed to estimate the direct genetic effects on actual milk yield and lactation length of Holstein crossbred dairy cows in the Aownoi Dairy Cooperative. The data comprised 869 lactation records from 850 cows that had calved during 2009–2010. The data were analyzed by the Restricted Maximum Likelihood Method and applying the Average Information Algorithm (AIREML) using univariate analysis. The factors having a direct effect on actual milk yield and lactation length were the year-season of calving (YS), the breed group of the cows and the lactation number. The investigated traits were lactation length and actual milk yield. The results showed that the overall mean (± SE) for milk yield and lactation length was 4,484.84 ± 13.60 kg.cow-1.lactation-1 and 376.94 ± 0.34 d, respectively. The lactation number had a signifi cant effect on the actual milk yield but there was no signifi cant effect of breed group, lactation number and year-season of calving on the lactation length. Estimates of heritability for the actual milk yield and lactation length were 0.22 ± 0.08 and 0.26 ± 0.09, respectively. 

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Published

2012-08-31

How to Cite

Endris, Mohammed, Sornthep Tumwasorn, Chaiwat Wongwan, Panwadee Sopannarath, and Somkiert Prasanpanich. 2012. “Estimation of Direct Genetic Effects on Milk Yield and Lactation Length in the Aownoi Dairy Cooperative”. Agriculture and Natural Resources 46 (4). Bangkok, Thailand:546-53. https://li01.tci-thaijo.org/index.php/anres/article/view/242908.

Issue

Vol. 46 No. 4 (2012): July-August

Section

Research Article

License

online 2452-316X print 2468-1458/Copyright © 2022. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/),
production and hosting by Kasetsart University of Research and Development Institute on behalf of Kasetsart University.