The Proportion of Multiple-ovulation Changes Among Different Months in Dezhou Black Jennies

Yang, Feng; Wu, Shuaishuai; Zhou, Jingqian; Yang, Weigang; Liu, Bing; Zhang, Ruitao; Ma, Jun; Li, Jingling; Ji, Chuanliang; Zeng, Shenming

doi:10.1016/j.jevs.2018.05.192

Cited by 6 publications

(6 citation statements)

References 6 publications

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“…Our results also confirmed that the ovulatory wave emerged in the early follicular phase, while an anovulatory wave developed from the luteal phase (Adams & Pierson, 1995). According to our previous observations, double ovulation status of the DB jennies varied from 15.63% to 33.52% in different months of the year (Yang et al, 2018). During the first half of an IOI, about 25% of mares developed an additional major wave (Sirois et al, 2010), and follicles in an ovulatory wave could occur during another ovulation.…”

Section: Discussionmentioning

confidence: 89%

“…The numbers of normal oestrous cycles, the double ovulation rate, HAFs and the numbers of degenerated follicles were analysed for the four seasons. Double ovulation was considered as two follicles ovulating within 3 days, and that the difference in diameter between two dominant follicles was less than 5 mm (Yang et al, 2018). The definition and features of HAFs in jennies are the same as in mares (Cuervo‐Arango & Newcombe, 2012).…”

Section: Methodsmentioning

confidence: 99%

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Characteristics of follicular dynamics and reproductive hormone profiles during oestrous cycles of jennies over an entire year

Yang

Li³

et al. 2021

Reprod Domestic Animals

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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.

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Section: Discussionmentioning

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Characteristics of follicular dynamics and reproductive hormone profiles during oestrous cycles of jennies over an entire year

Yang

Li³

et al. 2021

Reprod Domestic Animals

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“…Moreover, in the last 20 years, with the discovery of the nutraceutical capabilities of donkey milk and more and more after the massive use of donkeys to produce donkey hide gelatin, the interest in donkey as a food-producing animal increased (Panzani et al, 2020). In this new productive view, the donkey assisted reproductive techniques started to develop with several studies focusing on oestrous and ovulation synchronization (Fanelli et al, 2018(Fanelli et al, , 2019Liu et al, 2020;Yang et al, 2018;Zhou et al, 2018) to optimize the reproductive management of the donkey farms with timed artificial insemination and embryo transfer. To induce ovulation in the jenny hCG, GnRH analogues (Camillo et al, 2014;Carluccio et al, 2007;Liu et al, 2020) and Kisspeptin (Fanelli et al, 2022) have been used.…”

Section: Discussionmentioning

confidence: 99%

GnRH analogue triptorelin acetate induces ovulation in jennies during oestrus

Fanelli,

Moroni,

Berti

et al. 2024

Reprod Domestic Animals

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Most of the northern hemisphere donkey breeds are faced with the risk of extinction, thus donkey reproduction is considered an emerging branch of theriogenology, and the management of artificial insemination and induction of ovulation is a crucial point in setting up preservation protocols. For four consecutive cycles, six jennies' ovarian activity was routinely monitored; an ultrasound examination was performed daily from the evidence of a follicle diameter ≥27 mm until ovulation. Upon reaching a follicular diameter ≥32 ± 2 mm (Hour 0), oestrous jennies were treated alternatively with 0.1 mg triptorelin acetate, sc, (TRIP), 0.4 mg/sc of buserelin acetate (BUS) or saline, sc, (CTRL) and examined ultrasonographically at Hours 14, 24, 38, 42, 48, 62 and every 24 h until ovulation. Induction of ovulation was considered successful if ovulation occurred from 24 to 48 h after treatment. 11/12 cycles resulted in ovulation for TRIP and 12/12 for BUS and CTRL groups, respectively. Mean ± SD ovulation time after treatment was 37.3 ± 8.3, 47.1 ± 21.0 and 66.8 ± 25.9 h for BUS, TRIP and CTRL, respectively (p = .0032). Ovulation rates between h24 and h48 were 10/12 (83.3%) for both TRIP/BUS and 2/12 (16.7%) for CTRL, respectively (p = .003). Buserelin and triptorelin‐treated jennies had a 25 times higher probability to ovulate between Hours 24 and 48 than controls (p = .003), while there were no jenny and cycle effects on the ovulatory rate. The results of this study show how triptorelin successfully induced ovulation in jennies, like other GnRH analogues previously evaluated.

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“…The percentage of multiple ovulations reported are between 5 and 70 percent [39]. Yang et al [56] find that depending on the season, 16 to 34 percent of Dezhou black donkey jennies experience double ovulation. Often double ovulations do not result in viable twin pregnancies [34].…”

Section: Reproductive Performance Modelmentioning

confidence: 99%

“…In many research studies, the youngest breeding animals included are two or three years of age [34,35,38,39,[53][54][55][56]. The oldest animals in the non-Chinese studies are often between fifteen and twenty years but, for the two Chinese research studies, the oldest jennies were seven and ten years [54,56]. Information on farming systems is scarce but Fanelli et al [40] studied a donkey dairy farm with jennies aged between three and twenty years old.…”

Section: The Donkey Farming System Modelmentioning

confidence: 99%

The Potential for New Donkey Farming Systems to Supply the Growing Demand for Hides

Bennett

Pfuderer

2020

Animals

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The demand for donkey hides for ejiao, a Traditional Chinese Medicine, has resulted in rapidly increasing prices for donkey hides and donkeys. This has put pressure on donkey populations globally and has implications for donkey welfare and the livelihoods of those who rely on donkeys as working animals. The aim of the research was to explore the feasibility of setting up new donkey farming systems to supply the rising demand for ejiao using a system dynamics model of donkey production. Results show that the size of the initial female breeding herd, reproductive performance, age of reproduction, percentage of female births and average breeding life of donkeys are key variables affecting the time to build up the donkey population to supply the demand for hides, which will be at least ten to fifteen years. The implications of this are: (i) prices for donkey hides will continue to increase, (ii) companies producing ejiao will use other ingredients, (iii) China will continue to source donkey hides from around the world, and (iv) there will be continued theft and illegal trade of donkeys and concerns for rural households reliant on donkeys for their livelihoods and adverse impacts on donkey welfare.

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The Proportion of Multiple-ovulation Changes Among Different Months in Dezhou Black Jennies

Cited by 6 publications

References 6 publications

Characteristics of follicular dynamics and reproductive hormone profiles during oestrous cycles of jennies over an entire year

Characteristics of follicular dynamics and reproductive hormone profiles during oestrous cycles of jennies over an entire year

GnRH analogue triptorelin acetate induces ovulation in jennies during oestrus

The Potential for New Donkey Farming Systems to Supply the Growing Demand for Hides

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