Heritabilities and genetic correlations of body condition score and calving interval with yield, somatic cell score, and linear type traits in Brown Swiss cattle
Heritabilities and genetic correlations of body condition score and calving interval with yield, somatic cell score, and linear type traits in Brown Swiss cattle
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DOI：
10.3168/jds.2007-0280
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发表时间：
2007-12-01
影响因子：
3.5
通讯作者：
Bittante, G.
中科院分区：
文献类型：
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作者：
Dal Zotto, R.;De Marchi, M.;Bittante, G.
本研究旨在估计意大利棕色瑞士牛群体的身体状况评分 (BCS)、产犊间隔 (CI)、体细胞评分 (SCS)、产量和线性类型性状的遗传参数。 2002年至2004年，共收集了4,885个奶牛群的初产泌乳牛记录32,359份。谱系档案包括 96,661 只动物。使用 REML 分析多性状动物模型来估计 (co) 方差分量，而无需重复观察性状。 BCS 的估计遗传力为 0.15，CI 为 0.05，SCS 为 0.06，测试日产量性状的估计遗传力范围为 0.09 至 0.14，线性类型性状的估计遗传力范围为 0.07 至 0.32。 CI与产量和大多数线性型性状的遗传相关性呈正相关，而CI与BCS之间的相关性为负相关（-0.35）。对于类型性状，除力量、脚腕和跟高外，BCS 一般显示出中度负遗传相关性。 CI 或 BCS 与 SCS 的遗传相关性较低，但有利（分别为 0.19 和 -0.26）。估计的相关性表明，选择更高的产量和类型性状可能会对奶牛的繁殖能力产生不利影响。为了抵消这些影响并早期预测公牛繁殖力的育种价值，建议将 BCS 纳入育种计划。
This study aimed to estimate genetic parameters for body condition score ( BCS), calving interval ( CI), somatic cell score ( SCS), yield, and linear type traits for the Italian Brown Swiss cattle population. A total of 32,359 records of first-parity lactating cows were collected from 2002 to 2004 in 4,885 dairy herds. The pedigree file included 96,661 animals. Multiple-trait animal models were analyzed using REML to estimate ( co) variance components without repeated observations on traits. The estimated heritability was 0.15 for BCS, 0.05 for CI, and 0.06 for SCS, and ranged from 0.09 to 0.14 for test-day yield traits and from 0.07 to 0.32 for linear type traits. The genetic correlations of CI with yield and most linear type traits were positive, whereas the correlation between CI and BCS was negative (-0.35). For type traits, BCS showed, in general, a moderately negative genetic correlation except for strength, pastern, and heel height. The genetic correlation of CI or BCS with SCS was moderately low but favorable ( 0.19 and -0.26, respectively). The estimated correlations indicated that selection for greater yield and type traits can exert unfavorable effects on the reproductive ability of cows. To counterbalance these effects and to carry out early prediction of breeding values of bulls for fertility, inclusion of BCS in the breeding program is advisable.