National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing, China.
National Engineering Research Center for Gelatin-based Traditional Chinese Medicine, Dong-E-E-Jiao Co. Ltd., Done-E Country, China.
Reprod Domest Anim. 2021 Mar;56(3):448-458. doi: 10.1111/rda.13883. Epub 2021 Jan 5.
Although donkeys have been domesticated for over 6,000 years, limited information is available concerning their reproductive physiology, especially under intensive rearing conditions. The aims of this experiment were to study follicular dynamics and reproductive hormone variation in jennies during the inter-ovulatory interval in different seasons. A total of 12 continuous cycles of six Dezhou Black (DB) donkey jennies were examined in four different seasons. The diameters of the six largest follicles of each jenny were measured daily by ultrasonography, and blood samples were collected at fixed times for reproductive hormone assays. The results demonstrated that most jennies displayed regular oestrous cycles in all seasons. The follicular dynamics were similar in Spring, Summer and Winter, while the jennies had longer oestrous cycles with delayed follicular deviation and dominant selection in Autumn. At least two follicular waves were observed in each oestrous cycle, throughout the study, but two jennies presented oestrous cycles with three follicular waves in the Autumn. The numbers of follicular waves were consistent with the numbers of FSH surges. Oestrous characteristics of the jennies in a large herd were also analysed. The results showed that the rates of regular oestrous cycles were 83.1% (265/319), 89.6% (215/240), 80.2% (235/293) and 77.1% (178/231), with 26.4% (70/265), 19.5% (42/215), 22.1% (52/235) and 23.0% (41/178) double ovulation rates in Spring, Summer, Autumn and Winter, respectively. The results presented may be useful for donkey farms in the design of breeding strategies.
尽管驴已经被驯化了 6000 多年，但关于它们的生殖生理学的信息有限，特别是在集约化养殖条件下。本实验的目的是研究不同季节母驴在排卵间隔期间的卵泡动态和生殖激素变化。本研究共检测了 12 个连续周期的 6 匹德州黑驴母驴，分为 4 个不同季节。每天通过超声测量每头母驴的 6 个最大卵泡的直径，并在固定时间采集血液样本进行生殖激素检测。结果表明，大多数母驴在所有季节都表现出有规律的发情周期。在春、夏、冬三季，卵泡动态相似，而在秋季，母驴发情周期较长，卵泡偏离和优势卵泡选择延迟。在整个研究过程中，每个发情周期至少观察到两个卵泡波，但有 2 头母驴在秋季出现了三个卵泡波的发情周期。卵泡波的数量与 FSH 峰的数量一致。大群母驴的发情特征也进行了分析。结果表明，有规律发情周期的比例分别为 83.1%（265/319）、89.6%（215/240）、80.2%（235/293）和 77.1%（178/231），春季、夏季、秋季和冬季的双排卵率分别为 26.4%（70/265）、19.5%（42/215）、22.1%（52/235）和 23.0%（41/178）。这些结果可能对驴场的繁殖策略设计有用。
