Why are all the pups born by our rabbits little male rabbits?

The sex of rabbits is determined by chromosomes, and the X chromosome in female rabbits carries sex-determining genes. So whether a rabbit is male or female depends on whether its genes come from its father or mother. If the X chromosome in the female rabbit is paired with the X chromosome from the father, then the rabbit is female. If the X chromosome in the female rabbit is paired with the Y chromosome from the father, then the rabbit is male.

In addition, the ovary of the female rabbit can only produce one hormone, which is necessary for the sexual development of the male rabbit. Therefore, even if the female rabbit has a gene to promote the sexual development of the male rabbit, it may be unable to express it because of the lack of necessary hormones, resulting in the young rabbits being male.

Of course, this is only from the general genetic and biological point of view to explain this problem, and it can not be applied to all situations. The genetic information and environmental factors of each rabbit are unique, so the fertility of each rabbit may be different. If you have more questions about the fertility of rabbits, it is recommended to consult a professional veterinarian or zoologist.