Ovulation and Corpus Luteum Development

Bergfelt, D.R.; Adams, Gregg P.

doi:10.1016/b978-0-7216-0252-3.50005-9

Cited by 18 publications

(27 citation statements)

References 19 publications

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“…Unlike the uninformative urinary estrogen patterns, progesterone profiles were indicative of ovulation and luteal phase interval in the onager. The transient decline and rebound in excreted progesterone in the first month of pregnancy also has been observed in the domestic horse, which appears to reflect a resurgence in primary CL activity due to systemic production of equine chorionic gonadotropin [58]. The duration of gestation in the onager (321-348 days, from studbook data and animal observations) was variable but less so than the highly variant intervals reported in the domestic horse (305-405 days [59]), donkey (331-421 days [60,61]), and zebra (351-438 days [48,62]).…”

Section: Reproduction In the Persian Onagermentioning

confidence: 87%

Fundamental Studies of the Reproductive Biology of the Endangered Persian Onager (Equus hemionus onager) Result in First Wild Equid Offspring from Artificial Insemination1

Schook

Wildt

Weiss³

et al. 2013

Biology of Reproduction

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We studied the Persian onager (Equus hemionus onager), an endangered equid subspecies. The objective was to characterize endocrine patterns and ovarian follicular dynamics of females as well as seminal traits and sperm sensitivity to cryopreservation in males as a prerequisite to testing the feasibility of artificial insemination (AI). Urinary progesterone and estrogen metabolite profiles were determined by enzyme immunoassay in 11 females. Serial ultrasonography of ovarian activity was performed for 2 mo in a subset of four females. Females were seasonally polyestrous (June-November). Ovarian morphometry via ultrasonography and urinary progesterone profiles were more reflective of reproductive events than urinary estrogen patterns, and preovulatory follicle size was smaller than reported for other equid species. There was evidence for lactational suppression of estrus for up to 1.5 yr in nursing dams. Electroejaculation allowed recovery of highly motile sperm from 7, anesthetized males on 57% of occasions. Spermatozoa, including motility and acrosomal integrity, were resilient to freeze-thawing. Artificial insemination was successful in 2 of 3 females following detection of a dominant follicle and deslorelin administration, resulting in births of a healthy female and male foal by using fresh/chilled and frozen/thawed sperm, respectively.

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Section: Reproduction In the Persian Onagermentioning

confidence: 87%

Fundamental Studies of the Reproductive Biology of the Endangered Persian Onager (Equus hemionus onager) Result in First Wild Equid Offspring from Artificial Insemination1

Schook

Wildt

Weiss³

et al. 2013

Biology of Reproduction

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“…a preovulatory follicle ≥35 mm together with maximal or decreasing endometrial oedema [21]. Inseminations were performed according to standard practices once a mare's ovulation was adjudged imminent, i.e.…”

Section: Artificial Inseminationsmentioning

confidence: 99%

Ovarian function and pregnancy outcome in pony mares following immunocontraception with native and recombinant porcine zona pellucida vaccines

Joone

Bertschinger

Gupta

et al. 2016

Equine Veterinary Journal

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“…The average follicle is said to develop at a rate of 2.7 mm/day [2] but this may vary from 2 to 5 mm/day or even no growth over the 3–4 days preceding ovulation [3]. Frequently, when observations are made at intervals of less than 24 h in the immediate pre-ovulatory period, the largest recording is not the one made just before ovulation [4]. The apparent reduction in diameter in this period may be due to a problem of measurement of an irregular shaped softening follicle or to actual leakage of follicular fluid at the beginning of ovulation.…”

Section: Introductionmentioning

confidence: 99%

Growth rate of ovulatory follicles during the first ovulatory oestrus (after seasonal anoestrus) and subsequent oestrous period in Irish Draught mares

Newcombe¹,

Cuervo‐Arango

2013

Ir Vet J

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It is believed that during the spring transition, the developing follicle tends to grow more slowly, persist longer and grow to a larger diameter prior to ovulation than at subsequent oestrus periods. A general suspicion, that the first ovulation of the year is less fertile than subsequent ovulations could be explained by a slower growth rate of the ovulatory follicle during transition with the consequent production of a subfertile oocyte. By detailed serial examination of the same group of Irish Draught mares over three winter/spring periods, no significant difference was found in either growth rate or pre-ovulatory diameter when compared with subsequent ovulations. Mean growth rates over the ten days prior to ovulation were 2.20 mm/day (range 1.18 to 3.64) and 2.19 mm/day (range 1.25 to 3.41) for first and subsequent ovulations respectively. Mean maximum pre-ovulatory diameters were 44.7 mm (range 35 to 59) and 43.5 mm (range 31 to 57.5) for first and subsequent ovulations respectively. The impression gained by practitioners that the first follicle develops more slowly during the transition to the first ovulation of the season may be due to less frequent examinations and consequently a failure to observe and record that follicles may grow and then regress during this period. The largest follicle observed a few days previously is not necessarily the same large follicle found at a later examination.

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Ovulation and Corpus Luteum Development

Cited by 18 publications

References 19 publications

Fundamental Studies of the Reproductive Biology of the Endangered Persian Onager (Equus hemionus onager) Result in First Wild Equid Offspring from Artificial Insemination1

Fundamental Studies of the Reproductive Biology of the Endangered Persian Onager (Equus hemionus onager) Result in First Wild Equid Offspring from Artificial Insemination1

Ovarian function and pregnancy outcome in pony mares following immunocontraception with native and recombinant porcine zona pellucida vaccines

Growth rate of ovulatory follicles during the first ovulatory oestrus (after seasonal anoestrus) and subsequent oestrous period in Irish Draught mares

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