The relationship between Robertsonian translocation and fertility in the herd of Japanese Black bulls.
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概要
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To study the relationship between Robertsonian translocation and fertility in the herd of Japanese Black bulls, the cytogenetical survey was carried out on the 119 bulls. Ten bulls (8.4%) showed the 2 types of Robertsonian translocation; 1/29 translocation (6 bulls) and 7/21 translocation (4 bulls). Translocation carrier bulls were derived from 3 strains (C-E) out of 5 strains (A-E) in Japan, showing 1/29 translocation only in C strain, both types of translocation in D strain, and 7/21 translocation only in E strain. The semen quality in a bull with 1/29 translocation did not differ from those in the 4 bulls with normal karyotype. The conception rate (44.1% in average) in bulls with translocation was significantly different from those (62.5% in average) in normal bulls (p<0.05). As a result of the sperm chromosome study using an interspecific in vitro fertilization system with zona-free hamster oocytes, the incidence of chromosomally unbalanced spermatozoa was 4.4% (5/114 sperms) in a translocation carrier bull. The incidences of structurally abnormal spermatozoa were 29.8% (34/114 sperms) in a translocation carrier bull, and were higher than those of 15.2% (22/144 sperms) in normal bulls with a significant difference (p<0.01). From the results obtained, it seemed that 2 types of Robertsonian translocation are widely spread in the herd of Japanese Black bulls and may be derived from the fixed strains. And it was estimated that the cause of low fertility in translocation carrier bulls may be correlated with a high inci-dence of unbalanced and structurally abnormal sperms.
- 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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