Abstract
The occurrence of twinning has been documented for muskox in both wild and captive populations. Of two known captive twin births only one set survived beyond 120 days. In both cases the twins were male-female pairs and both females showed abnormal sexual development. Two sets of stillborn twins have also been recorded. All four stillborn fetuses were female and none showed anomalies of the reproductive tract upon post-mortem examination. Blood cultures from the surviving male and female twins revealed that both were chimeric, indicating the admixture of fetal blood. Fibroblast cultures were normal for the respective sex of each individual. The freemartin heifer had anatomical abnormalities of the clitoris as well as the secondary sex characteristics of a male.
Highlights
Twinning has been previously reported in the characteristics (Watson, pers. comm. and persomuskox, Ovibos moschatus, in both free-rangingnal observation)
Marcum, (1974) pretion of two wild populations in Alaska revealed sents a classic description of the freemartin synthat 4 of 102 pregnant cows were carrying drome. twins during the latter half of pregnancy (Din- The abnormalities observed for the freemarneford and Anderson, 1984)
Four sets of twins have been born in captive line behavioral changes
Summary
Twinning has been previously reported in the characteristics (Watson, pers. comm. and persomuskox, Ovibos moschatus, in both free-rangingnal observation). Twinning has been previously reported in the characteristics Both of these females were and captive populations (Alendal, 1979; Pattie, probably freemartins, only one was 1986;-Reindl, 1987; Wilkinson, 1971). Twins during the latter half of pregnancy (Din- The abnormalities observed for the freemarneford and Anderson, 1984). The numbers, sex- tin, studbook number 248, included an ines, and reproductive ability of surviving twins creased physical size, an enlarged horn boss in these free-ranging populations is unknown.
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