One of the foals was a female, sired by a jack. Unlike her mother, she was sterile. The other, sired by a five-gaited Saddlebred stallion, exhibited no characteristics of any donkey. That horse, a stallion, was bred to several mares, which gave birth to …

2023年10月19日 · In sterile hybrid animals, like mules, this process can go wrong in several different places. For one, chromosomes fail to align properly in stage one of meiosis, perhaps due the mismatch between horse and donkey chromosomes.

2007年6月20日 · A mule cannot make sperm or eggs. So this is a big reason for a mule being sterile. But how is it alive at all? Well, there are a couple of reasons. First, having an odd number of chromosomes doesn't matter for everyday life. A …

2024年10月12日 · - Mules are almost always sterile because of their chromosomal composition. - They can have normal sexual behaviors, but this does not lead to reproduction. - In very rare cases, a female mule can conceive, but this remains a biological exception.

7 小时之前 · These rare cases don’t negate the fact that the vast majority of mules and hinnies are sterile. Beyond Chromosomes: Additional Factors. While the primary reason for infertility in mules and hinnies is the odd number of chromosomes and the resulting problems with meiosis, there may be contributing factors. The hormonal imbalance and the hybrid ...

2023年7月21日 · Most mules are sterile but, very rarely, they can reproduce. However, you are more likely to be struck by lightning than own a mule that is able to have a baby. Here are the stories of some of the mules who have had babies throughout history.

2022年7月26日 · Get ready for all of the science behind why mules are sterile and interspecies hybrids often have trouble with fertility. By Jennifer Nemec | Updated on July 26, 2022

Mules are sterile while donkeys can reproduce normally. Donkeys have 62 chromosomes and horses have 64 (or 32 pairs). Mules are hybrids and only have 63 chromosomes, so they cannot produce the haploid cells required for reproduction. The …

2024年11月11日 · Mules are sterile hybrids, meaning they inherit characteristics from both parents but are unable to reproduce. This is due to the differences in the number of chromosomes between horses and donkeys. While horses have 64 chromosomes and donkeys have 62, mules end up with 63, which disrupts their reproductive capabilities.

2023年9月8日 · Mules, as a hybrid species, are typically considered sterile due to their uneven chromosomal count—horses having 64 chromosomes and donkeys having 62. However, in exceptionally rare cases, some molly mules have perplexed breeders by exhibiting fertility.