Oestrus cycle characteristics and prediction of ovulation in Catalonian jennies

Taberner, E.; Medrano, Ana Cristina Solís; Martínez, Ana Isabel Peña; Rigau, Teresa; Miró, Jordi

doi:10.1016/j.theriogenology.2008.06.096

Cited by 40 publications

(59 citation statements)

References 15 publications

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“…Donkeys are often described as displaying longer estrous cycles than horses but similar in length to pony mares [7,13]. This also applies to Asinina de Miranda jennies.…”

Section: Discussionmentioning

confidence: 99%

“…There are a few studies available on the characteristics of the estrous cycle for other European donkey breeds [7,11,13,14]. However, there have only been a limited number of comparative studies on differences in donkey breeds, like those known to exist in breeds of horse [15], surveying characteristics such as the rate of ovulation and the prevalence of multiple ovulations, the size of the ovulatory follicle, and the moment of ovulation within the follicular stage.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of the estrous cycle of Asinina de Miranda jennies (Equus asinus)

Quaresma

Payan-Carreira

2015

Theriogenology

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This study aims to characterize the estrous cycle of Asinina de Miranda jennies in the breeding season, on the basis of data collected from serial ultrasonographic examination and serum progesterone determinations in 14 females during a total of 33 cycles. The length of the interovulatory interval was 23.8 ± 0.55 days, the diestrus and estrus lasting 17.9 ± 0.46 days and 6.65 ± 0.30 days, respectively. Age and body condition score (BCS) affected the length of the interovulatory intervals; BCS also influenced the diestrus length and the time in heat after ovulation (P > 0.05). The incidence of single, double, and triple ovulations was 57.58%, 36.36%, and 6.06%, respectively. Multiple ovulations affected neither the length of the interovulatory interval nor the individual cycle stages (P > 0.05) but lengthened the interval from the beginning of estrus to the last ovulation (P = 0.01). When combined with age, higher BCS affected the ovulation rate (P = 0.001). Deviation of the dominant follicle occurred around Day 8.7 (Day 0 = ovulation) when both single and multiple ovulations were considered. The dominant follicle was larger at divergence in single ovulators (19.18 ± 0.97 mm) compared with that in multiple ovulators (18.05 ± 1.16 mm). The overall maximum follicular diameter before ovulation was smaller in multiple ovulatory cycles than that in single ovulatory cycles (37.2 ± 0.83 mm vs. 40.2 ± 1.41 mm, respectively; P = 0.03). The daily growth rate of dominant follicles was independent of the ovulation rate (P > 0.05) for the intervals before and after the estrus onset. The dominant follicle size and the follicle growth rates were independent of BCS (P > 0.05). Data collected in this study revealed resemblances between Mirandese and other Iberian and Brazilian breeds with regard to estrous cycle characteristics.

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“…Donkeys are often described as displaying longer estrous cycles than horses but similar in length to pony mares [7,13]. This also applies to Asinina de Miranda jennies.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of the estrous cycle of Asinina de Miranda jennies (Equus asinus)

Quaresma

Payan-Carreira

2015

Theriogenology

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“…All the CL detected showed strong echogenicity and a hyperechogenic central area [40]. In contrast, an active CL in the mare is normally characterized by a uniform echogenic pattern with a hypoechogenic central area [20].…”

Section: Discussionmentioning

confidence: 99%

“…In cows, plasma progesterone decreases by 0.5 hours after PGF2a administration, but luteal blood flow remains unchanged until 8 hours, coinciding with the initiation of structural luteolysis as reflected by a significant reduction in CL volume [31]. In mares, CL-CSA decreases while luteal tissue echogenicity increases after induced luteolysis [40]. In the present jennies, the CL-CSA decreased slowly over the first 48 hours compared with the luteal blood flow and plasma progesterone, suggesting that functional luteolysis manifests itself before structural luteolysis.…”

Section: Discussionmentioning

confidence: 99%

Color Doppler provides a reliable and rapid means of monitoring luteolysis in female donkeys

et al. 2015

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“…Only few studies have been carried out on the physiology of reproduction in donkeys (Henry et al 1998;Pugh 2002;Carluccio et al 2007;Taberner et al 2008) but no data are available on the thyroid function in this species.…”

mentioning

confidence: 99%

Total and free iodothyronines profile in the donkey (Equus asinus) over a 12-month period

et al. 2012

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Several studies show the correlation between thyroid function and reproductive activity in horses, but no data are available in donkeys. The aim of this study was to determine physiological thyroid changes occurring in 10 pregnant and 14 barren donkeys over a period of 12 months. Blood samples were collected monthly from the jugular vein of pregnant and barren donkeys from June 2008 to June 2009. No significant differences (P < 0.05) in iodothyronine concentrations were observed between pregnant and barren donkeys in the same month. Seasonal total thyroxine (T 4 ) and free triiodothyronine (fT 3 ) patterns remained unmodified, regardless of physiological state, with the lowest T 4 levels at September and the highest at February, and the lowest fT 3 levels at June and the highest at July, in both pregnant and barren donkeys. Ranges of total triiodothyronine (T 3 ) concentrations in pregnant donkeys over a 12 months period ranged from 1.57 to 2

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Oestrus cycle characteristics and prediction of ovulation in Catalonian jennies

Cited by 40 publications

References 15 publications

Characterization of the estrous cycle of Asinina de Miranda jennies (Equus asinus)

Characterization of the estrous cycle of Asinina de Miranda jennies (Equus asinus)

Color Doppler provides a reliable and rapid means of monitoring luteolysis in female donkeys

Total and free iodothyronines profile in the donkey (Equus asinus) over a 12-month period

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