우리나라 Holstein 경산우의 분만간격과 비유곡선모수와의 상관관계
Correlation between Calving Interval and Lactation Curve Parameters in Korean Holstein Cows
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초록
본 연구는 분만간격과 비유곡선 모수들 간의 상관관계를 규명하기 위하여 농협중앙회 젖소개량사업소에서 진행하고 있는 유우군 능력검정사업에 참여하고 있는 홀스타인 젖소로부터 조사한 착유기록36,505개를 분석하였는데, 분석에 이용된 착유기록은 모두 2011년부터 2013년 사이에 분만한 경산우로부터 조사하였다. 비유곡선 모수는 Wood 모형을 적용하여, SAS 9.2 NLIN Procedure를 이용해 추정하였다. 분만년도-계절(봄, 여름, 가을, 겨울)효과와 산차(2, 3, 4산차)의 효과를 고정효과로 한 다형질 일반선형모형으로 SAS(GLM procedure)를 이용하였다. 분만간격, 305일 유량, 비유곡선모수(A,b, c), 비유지속성, Peak 일시 및 Peak기 유량에 대해 분만년도-계절과 산차의 효과는 모두 유의적으로 나타났다(p<0.05). Wood 모형으로 추정한 비유곡선 함수는 2, 3 및 4산차에 대해 각각 y t=24.66t 0.175e - 0.00302t , y t=24.69t 0.192e - 0.00334t 및 y t=24.22t 0.200e - 0.00341t으로 추정되었다. 분만간격과 305일 유량, 모수값 A, b, c, 비유지속성, Peak 일시 및 Peak기 유량과의 표현형상관(잔차상관)은 각각 0.093, -0.014, 0.028, -0.046, 0.099, 0.085 및 0.052으로 나타났다. 분만간격이 길어지면 비유곡선의 상향경사도, 비유지속성, Peak 일시, Peak기 유량은 증가하고, 비유곡선의 하향경사도는 감소하여, 305일 유량은 증가할 것으로 판단된다.
Abstract
This study was aimed to identify the phenotypic relationships between calving interval andlactation curve parameters in Korean Holstein cow. The data of 36,505 lactation records wasobtained from the Dairy Herd Improvement program run by Dairy Cattle Improvemnet Center ofNational Agricultural Federation of Korea. All lactation records were collectied from themultiparous cows calving between 2011 to 2013. The estimated lactation curves were drawnusing Wood model based on actual milk yield records, and NLIN Procedure of SAS program(ver. 9.2). General linear multivariate models for calving interval, 305-d milk yield, lactationparameters(A, b, c), persistency, peak day, and peak yield included fixed effects of calvingyear-season (spring, summer, fall and winter) and parity(2, 3 and 4). For calving interval, 305-dmilk yield, lactation parameters(A, b, c), persistency, peak day and peak yield, all two fixedeffect(calving year-season, parity) were significant(p<0.05). The estimated lactation functions usingWood model for 2, 3, and 4 parity were y t=24.66t 0.175e - 0.00302t , y t=24.69t 0.192e - 0.00334t , and y t=24.22t 0.200e - 0.00341t, respectively. Phenotypic correlation (partial residual correlation) betweencalving interval and 305-d milk yield, A, b, c, persistency, peak day, and peak yield were0.093, -0.014, 0.028, -0.046, 0.099, 0.085, and 0.052, respectively. To conclude, if calvinginterval increase then ascent to peak, persistency, peak day and peak yield are increase, anddescent after peak is decrease. So, total 305-d milk yield is increase.
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