RELATIONSHIP OF FERTILITY TO MILK-YIELD IN SWEDISH CATTLE
RELATIONSHIP OF FERTILITY TO MILK-YIELD IN SWEDISH CATTLE
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DOI：
10.3168/jds.s0022-0302(91)78169-1
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发表时间：
1991-01-01
影响因子：
3.5
通讯作者：
LINDHE, B
中科院分区：
文献类型：
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作者：
OLTENACU, PA;FRICK, A;LINDHE, B
数据包括48,830头和21,136头瑞典红牛和白牛以及瑞典黑牛和白牛。处女小母牛和第一次哺乳奶牛的生育力是通过第一次服务妊娠率和每一次怀孕的服务次数来衡量的。考虑的生产性状为哺乳前100d产生的FCM。两个品种的处女小母牛和首次哺乳奶牛的生育性状遗传力都在0.05左右。在两个品种中，两个品种内生育指标之间的遗传相关性接近1，这表明这些指标是同一性状的指标。瑞典红白母牛处女受精率与第一次哺乳的遗传相关系数约为0.88，瑞典黑白母牛的遗传相关系数在0.6~0.7之间。第一哺乳奶牛的繁殖力与产奶量之间的关系是拮抗的，瑞典红白和瑞典黑白品种的第一次受孕率与产奶量之间的遗传相关分别为-0.13和-0.32。处女小母牛的第一次服务妊娠率与第一次哺乳产奶量之间的关系也是拮抗的，瑞典红白和瑞典黑白品种的遗传相关分别为-0.14和-0.41。
Data consisted of 48,830 and 21,136 records of Swedish Red and White and Swedish Black and White cattle. Fertility in virgin heifers and in first lactation cows was measured by first service pregnancy rate and number of services per pregnancy. Production trait considered was FCM produced in first 100 d of lactation. The heritabilities for fertility traits in virgin heifers and first lactation cows were about .05 in both breeds. The genetic correlations between fertility measures within parity were close to one in both breeds, suggesting that these were measures of the same trait. The genetic correlations between fertility in virgin heifer and in first lactation were about .88 for Swedish Red and White breed and between .6 and .7 for Swedish Black and White breed. The association between fertility and production in first lactation cows was antagonistic, with genetic correlations between first service pregnancy rate and milk yield of -.13 and -.32 for Swedish Red and White and Swedish Black and White breed, respectively. The association between first service pregnancy rate in virgin heifers and milk yield in first lactation was also antagonistic, with genetic correlations of -.14 and -.41 for Swedish Red and White and Swedish Black and White breed, respectively.