Autosomal trisomy detected in the five cases of Japanese Black calves.

概要

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From 1994 to 1998, 5 Japanese Black calves were born as infirm calves, and eitherr had chromosomal trisomy or were suspected of having chromosomal trisomy. Blood biochemistry examinations were conducted on 3 cases, and pathological investigations on 2 cases. As the result of chromosomal testing, all cases were identified with 61, XX or 61, XY autosomal trisomy; 2 cases were presumed to have trisomy of chromosome 17, but chromosomal pairs with trisomy were not confirmed in other cases. According to the reports, low bodyweight, poor development and small eye sockets were identified in all cases, and shortening of maxilla were identified in all except one cases. In 3 cases, the calves required several days to stand and suck on cows milk by itself; many had incidence of diarrhea due to overeating and infection. Ovarian and uterine maldevelopments were identified in 2 cases, and retained testis in 1 case. The age of cows at the birth of calves with trisomy were 2-8 years old (mean 4.5 years old), and the number of calving were primiparous to 6 calving (mean 3.2 calving). All had different sires.
日本家畜臨床学会の論文