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KMID : 1025520010430050623
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Journal of Animal Science and Technology
2001 Volume.43 No. 5 p.623 ~ p.630
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Estimation of Environment and Sire Effects for Somatic Cell Score in Different Lactation Period of Holstein Cattle
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안병석/Ahn, B. S.
김준식/최유림/김현섭/정하연/전병순/서국현/Kim, J. S./Choi, Y. L./Kim, H. S./Jeong, H. Y./Jeon, B. S./Suh, K. H.
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Abstract
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A total of 2,215 available records of 571 heads tested from 1997 to 2000 at National Livestock Research Institute(NLRI) were used to estimate environment and sire effects for somatic cell count(SCC) in different lactation period of 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 SCC transformed into SCS= log₂(SCC/100000)+3 was analysed by Milkoscan 4000^ⓡ for each month.
A lactation was divided into the three periods which were early period(earlier than 90 days in milk), middle period(91 to 200 days in milk) and late period(later than 200 days in milky. The effects of milking year and month, parity, milking parlour style and sire for whole lactation period showed significant differences on SCS(P$lt;0.01). But the above factors on SCS showed different effects in accordance with the lactation periods. The somatic cell scores from January to July were lower than those from August to November. A minimum level of SCS showed at first parity and then increased. For style of milking parlour. SCS in the tandem style was lower than that in herringbone style.
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