Eldridge F, Suzuki Y
J Hered. 1976 Nov-Dec;67(6):353-60. doi: 10.1093/oxfordjournals.jhered.a108752.
A female, horse-like foal was apparently born to a mare mule from mating to a Shetland stallion. The presence of three pregnant Shetland mares in the same pasture, however, raised some questions about parentage, even though all three mares apparently gave birth to single foals within 6 weeks after the birth of the propositus. The transferrin system indicated that the foal was not born to the mare mule but was the offspring of one of the Shetland mares. Apparently one Shetland mare gave birth to twins 3 to 6 weeks apart, and the mare mule came into lactation spontaneously and adopted the first twin. The offspring was determined to be a horse by appearance, karyotype, blood type, and voice.
一匹母骡与一匹设得兰种马交配后，产下了一匹貌似马驹的雌性幼崽。然而，同一牧场中有三匹怀孕的设得兰母马，这引发了一些关于亲子关系的疑问，尽管在这头先出生的幼崽出生后的6周内，这三匹母马都明显产下了单胎幼崽。转铁蛋白系统显示，这匹幼驹并非母骡所生，而是其中一匹设得兰母马的后代。显然，有一匹设得兰母马相隔3至6周产下了一对双胞胎，而母骡自然进入泌乳期并收养了第一只幼崽。从外貌、核型、血型和声音判断，这只幼崽被确定为马。
