科研之友
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摘要
Donkeys have been valuable to people in different cultures and countries for centuries. Nowadays, they are used in recreation, in therapeutic activities, and mainly for the production of mules. Donkeys and horses show reproductive similarities and differences. The reproductive cycle and gestation length in jennies are longer than in mares, and they exhibit some special features in their reproductive behavior. Seasonality is less evident, with other factors besides photoperiod influencing it. Jacks' reproductive organs are larger than those of stallions, and they also take a longer time to achieve ejaculation. Insemination with raw semen is carried out on many farms, and some efficient protocols with cooled semen have been applied; however, use of frozen-thawed semen remains a challenge. Embryo transfer results have improved over the last years, but to become an effective reproductive technique, pregnancy rates need to be increased. Therefore, a deeper knowledge of reproductive physiology would help to achieve suitable protocols for applying reproductive biotechnologies in donkeys.
- 出版日期2018-6
