7/21ローバートソン型転座を保有する黒毛和種種雄牛の精液性状

Abstract

A study was conducted to investigate semen characteristics of Japanese Black bulls carrying the 7/21 Robertsonian translocation and its effect on fertilization. The semen analyses were carried out on 24 Japanese Black bulls for artificial insemination of which four were bulls heterozygous for the 7/21 translocation and one was a homozygous bull. There was no signifi-cant difference in semen characteristics between the chromosomally normal bulls and bulls with the translocation. The seminiferous tubules in bulls carrying the 7/21 translocation seemed to be normally developed with a histologically normal spermatogenesis. Fertilization rate in in-vitro culture systems was not different between the normal bulls and bulls with the translocation. The 7/21 translocation seemed to cause no adverse effect on semen characteristics and fertiliza-tion.