Lozano CB, Von CEA, Meza LC

Language: Spanish
References: 11
Page: 27-33
PDF size: 509.07 Kb.

ABSTRACT

The aim of the study was to analyze chromosomally the mule and her calf and to determine its maternity. The mule (Equus mulus) is the result of crossing E. caballus X E. asinus; the first has 64XX (female) or 64XY (male), the second 62XX or 62XY. The hybrid of donkey and mare cross will be a mule (male or female) with 63XX o 63XY respectively, while the breeding of horses and donkeys is considered a hinny (male or female), in either case the product is sterile; some mules crossed with horse or donkey could conceive and may come to give birth, the karyotype of the mule and its calf was determined by a common technique in peripheral blood. The mule that gave birth in Zacatecas area, it is considered mosaicism by having two cell populations 60XX/62XX of which 67% are 62XX; y 32 % 60XX. The phenotype is a hybrid; even though E. caballus predominates. Reproductive behavior was visibly manifest, but even though the service was given, in natural mating with donkey and horse and artificial insemination in natural cycles the mule did not become pregnant. The mule calf presented a karyotype of 63XY equal in number to a hybrid, but genotypically E. caballus characteristics were observed, such as the chromosome pair 27, with three points; the chromosome “Y” acrocentric inherited from the father y el X submetacentric inherited from the mule which in turn inherited it from the mare, as well as chromosome morphology typical of a horse.

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