|
KMID : 1025520010430050609
|
|
Journal of Animal Science and Technology
2001 Volume.43 No. 5 p.609 ~ p.614
|
|
|
Estimation of Genetic Parameter of Somatic Cell Score in Small Herd of Holstein Cattle
|
|
안병석/Ahn, B. S.
최유림/강수원/권응기/조용민/나기준/Choi, Y. L./Kang, S. W./Kweon, U. G./Cho, Y. M./Na, K. J.
|
|
|
Abstract
|
|
|
A milking records of 551 heads tested from 1997 to 2000 at National Livestock Research Institute(NLRI) were used to estimate genetic parameters of somatic cell score(SCS) in different lactation period in Holstein Cattle. The cows were fed according to NRC and managed by the method of NLRI. Milk yields were recorded twice a day with 12 hours interval and somatic cell count(SCC) was analysed by Milkoscan 4000^ⓡ for every month, and transformed into SCS= log₂(SCC/100000) + 3.
A lactation was divided into three periods which were early(earlier than 90 days in milk). middle(91 to 200 days in milk), and late period(later 201 days in milk). Average somatic cell score of herd was 3.07±2.10. Heritabilities for early, middle, late, and whole period were 0.18, 0.39, 0.47 and 0.34, respectively. Genetic correlations between SCS and milk yield varied from -0.01 to 0.13, and phenotypic correlations were 0.05, -0.01, 0.04 and 0.01 in early, middle, late and whole period, respectively. SCS and immunoglobulin G(IgG) was highly correlated.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|
|