Choi, S.B.
(National Livestock Research Institute, R.D.A.)
,
Lee, J.W.
(National Livestock Research Institute, R.D.A.)
,
Choy, Y.H.
(National Livestock Research Institute, R.D.A.)
,
Na, K.J.
(National Livestock Research Institute, R.D.A.)
,
Kim, N.S.
(Dept. Animal Science, Chungbuk National University)
This study was conducted to estimate phenotypic and genetic parameters of body condition score (BCS) and reproductive traits in Hanwoo cows. DFREML procedures were applied to obtain variance-covariance components and heritability estimates with single or two-trait models. Estimates of phenotypic cor...
This study was conducted to estimate phenotypic and genetic parameters of body condition score (BCS) and reproductive traits in Hanwoo cows. DFREML procedures were applied to obtain variance-covariance components and heritability estimates with single or two-trait models. Estimates of phenotypic correlations of BCS at service with BCS at calving was 0.16 and 0.26 with calving interval, 0.08 with gestation length, and 0.06 with number of services per conception, respectively. Estimates of phenotypic correlation of BCS at calving was 0.10 with calving interval, 0.13 with gestation length, and 0.10 with number of services per conception, respectively. Estimates of phenotypic correlation were low and negative, -0.11 between calving interval and gestation length and -0.13 between gestation length and number of services per conception. Estimates of direct genetic correlation were -0.06, between BCS at service and BCS at calving, 0.37 between BCS at service and BCS at weaning, and -0.18 between BCS at calving and BCS at weaning. Estimates of direct genetic correlation of days from calving to the 1st service were 0.17 with number of services per conception and -0.21 with BCS at service. Estimates of direct genetic correlation for BCS at calving were -0.02 with number of services per conception and -0.08 with BCS at service. Estimates of direct genetic correlation for BCS at weaning were 0.02 with number of services per conception and -0.07 with BCS at service. Estimates of direct heritability from single trait analyses were 0.13 for BCS at service, 0.20 for BCS at calving, 0.02 for BCS at weaning, and 0.20 for number of service per conception, respectively. Estimates of direct heritability were 0.20 for birth weight and 0.10 for weaning weight.
This study was conducted to estimate phenotypic and genetic parameters of body condition score (BCS) and reproductive traits in Hanwoo cows. DFREML procedures were applied to obtain variance-covariance components and heritability estimates with single or two-trait models. Estimates of phenotypic correlations of BCS at service with BCS at calving was 0.16 and 0.26 with calving interval, 0.08 with gestation length, and 0.06 with number of services per conception, respectively. Estimates of phenotypic correlation of BCS at calving was 0.10 with calving interval, 0.13 with gestation length, and 0.10 with number of services per conception, respectively. Estimates of phenotypic correlation were low and negative, -0.11 between calving interval and gestation length and -0.13 between gestation length and number of services per conception. Estimates of direct genetic correlation were -0.06, between BCS at service and BCS at calving, 0.37 between BCS at service and BCS at weaning, and -0.18 between BCS at calving and BCS at weaning. Estimates of direct genetic correlation of days from calving to the 1st service were 0.17 with number of services per conception and -0.21 with BCS at service. Estimates of direct genetic correlation for BCS at calving were -0.02 with number of services per conception and -0.08 with BCS at service. Estimates of direct genetic correlation for BCS at weaning were 0.02 with number of services per conception and -0.07 with BCS at service. Estimates of direct heritability from single trait analyses were 0.13 for BCS at service, 0.20 for BCS at calving, 0.02 for BCS at weaning, and 0.20 for number of service per conception, respectively. Estimates of direct heritability were 0.20 for birth weight and 0.10 for weaning weight.
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제안 방법
(BIF, 1996; Whitman, 1975) 1 (severely emaciated) through 9 (very obese). Cows and heifers were evaluated three times each month during test years (1st, 15th, and 25th day) by one observer. Animals covered with thick and long hairs especially in cold winter days were palpated to ensure correct scoring.
The objective of this study was to estimate genetic parameters of and between days from cal.,ing to first service, number of services per conception, cal.,es’ birth and weaning weights and BCS of cows and heifers at services, at cal.,ing or at weaning which might vary with reproductive and physiological status, season and nutrition.
The objective of this study was to estimate genetic parameters of and between days from calving to first service, number of services per conception, calves’ birth and weaning weights and BCS of cows and heifers at services, at calving or at weaning which might vary with reproductive and physiological status, season and nutrition.
대상 데이터
Global maximum likelihood estimates were iteratively estimated using estimates from previous run as priors with each run to go within the variation range to be less than 10-6 Four separate animal models were applied in this study.
이론/모형
Series of mixed animal models were applied with MTDFREML package of derivative free REML procedure (Boldmann et al., 1995) to estimate genetic variances- covariances (of and) between traits.
TDFREML package of derivative free REML procedure (Boldmann et al., 1995) to estimate genetic variancescovariances (of and) between traits. Global maximum likelihood estimates were iteratively estimated using estimates from previous run as priors with each run to go within the variation range to be less than 10-6.
성능/효과
Genetic correlation between number of services per conception and BCS at weaning and between number of services per conception and days from cal.,ing to first service were both low and negative.
Heritability estimates of BCS at cal.,ing, BCS at weaning, days from cal.,ing to first service, and number of services per conception were low to moderate.
Heritability estimates from bivariate analyses (Table 10) were somewhat higher than those from univariate analyses (Table 5) except for BCS at services. Heritability estimates of BCS at calving, BCS at weaning, days from calving to first service, and number of services per conception were low to moderate.
후속연구
We expect that results from this study would be directly applied for better reproductive and feeding management of cows and heifers.
참고문헌 (14)
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