The effects of the 1/29 Robertsonian translocation upon fertility in the herd of Japanese Black Cattle.
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概要
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To study the effects of the 1/29 Robertsonian translocation upon fertility in the herd of the Japanese Black Cattle breed, the cytogenetic survey and the examination of breeding data were carried out on daughters of a 1/29 translocation heterozygous sire. The cytogenetic survey was carried out on 146 daughters (a toral of 58 heifers which were composed of 31 repeatbreeder heifers and 27 heifers with normal fertility, and 88 cows) of this sire. Twenty-seven cases (87.1%) out of 31 repeat-breeder heifers showed the 1/29 translocation. On the other hand, fifteen cases (55.6%) out of 27 heifers with normal fertility showed the 1/ 29 translocation. When comparing the numbers with 1/29 translocation between repeat-breeder heifers and heifers with normal ferrility, significant differences (p<0.05) were statistically found. Thirty-nine cases (44.3%) out of 88 cows were heterozygous for the 1/29 translocation. When comparing the numbers with 1/29 translocation between 58 heifers and 88 cows, significant differences (p<0.01) were statistically found. The breeding deta of 34 daughter cows with 1/29 translocation and 40 daughter cows with normal karyotype from translocation sire, and 128 control cows were collected from the breeding records, and the data were compared among 3 groups, respectively. There was an increase in the number of inseminations per pregnancy and a decrease in the conception rate in the cows from 1/29 teanslocation heterozygous sire. From these results, it was suggested that the 1/29 translocation would affect the decrease in fertility, and would result in the increase in the culling rate which was caused by sterility in the heifers of Japanese Black Cattle. Also, it was surmised that the high culling rate in subfertile heifers with 1/29 translocation would lead to the decrease in the incidence of translocation (from 72.4% to 44.3%) in muliparous cows. Therefore, it seems that there is no correlation between the occurrence of 1/29 translocation and the breeding data in multioarous cows.
- 日本家畜臨床学会の論文
日本家畜臨床学会 | 論文
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