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http://dx.doi.org/10.5187/JAST.2008.50.5.591

Relationships Among Cow Daily Milk Yield, Calf Body Weight at Birth and 3 Month of Age and Preweaning Daily Gain in Hanwoo  

Hwang, Jeong-Mi (Animal Genetic Improvement Division, National Institute of Animal Science)
Kim, Si-Dong (Animal Genetic Improvement Division, National Institute of Animal Science)
Choi, Jae-Gwan (Animal Genetic Improvement Division, National Institute of Animal Science)
Lee, Chae-Young (Ilsong Institute of Life Science, Hallym University)
Kim, Byung-Wan (Division of Animal Resource Science, College of Animal Life Sciences, Kangwon National University)
Kim, Jong-Bok (Division of Animal Resource Science, College of Animal Life Sciences, Kangwon National University)
Publication Information
Journal of Animal Science and Technology / v.50, no.5, 2008 , pp. 591-600 More about this Journal
Abstract
This study was conducted to investigate relationships among cow daily milk yield, calf body weight at birth and 3 month of age and calf preweaning daily gain. Cow daily milk yield(DMILK) of 90 days after postpartum measured by weigh-suckle-weight method, calf birth weight(BW), calf body weight at 3 month of age(WT3), and calf preweaning daily gain from birth to 3 month of age(PDG) were collected from June to November on 2002 and April to November on 2003. All traits studied were considered as cow traits and analysed by WOMBAT packages to obtain A-I REML(average information restricted maximum likelihood) estimates. Heritability estimate of daily milk yield uncorrected for cow-calf separation time(DMILK) was 0.39, which was not differ from 0.36 of heritability estimate corrected on the basis of 24 hour cow-calf separation time(CMILK). Heritability estimates for maternal genetic effects of BW, WT3 and PDG were respectively 0.28, 0.17 and 0.18. Genetic correlations between DMILK and maternal effect of BW, WT3 and PDG were respectively 0.59, 0.79 and 0.68. High genetic correlation coefficients of DMILK with WT3 and PDG indicate that selections for maternal breeding value for WT3 or PDG may be effective to enhance the cow’s milk production ability in Hanwoo.
Keywords
Heritability; Milk yield; Body weight; Hanwoo; Genetic correlation
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