Environmental effects and repeatability of the follicular diameter in mares

Rua, Miguel Alejandro Silva; Quirino, C. R.; Matos, Luis Fonseca; Rodrigues, Alex Souza; Bartholazzi, Aylton

doi:10.1590/rbz4820190047

Cited by 4 publications

(1 citation statement)

References 10 publications

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“…The timing of mating in racehorses is required to ensure the birth at the specific period (August-December), which will maximize the foal's age when participating in their first race (July). In tropical climates the mare will be able to estrus throughout the year in contrast to the condition of mares in sub-tropical countries [4]. Therefore, it is important to time the mating of mares from September to February each year, which is highly dependent on precise and accurate estrus detection methods.…”

Section: Introductionmentioning

confidence: 99%

Estrus detection on different thoroughbred crossbreed horses with vaginal smear and vaginal acidity method

Sitaresmi,

Wulandari,

Hudaya

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Breeding manipulation season in racehorses is required to ensure the birth at the specific period (August-December), which will maximize the foal’s age when participating in their first race (July). Therefore, it is important to time the mating of mares using highly accurate estrus detection methods. This research was conducted to identify the differences data using vaginal smear and pH vagina of Thorougbred crossbreed mares in estrus and anestrus phases. Fifteen multiparous mares were conducted with a period of estrus of 19-22d. The result data showed significant differences (P<0.05) in the vaginal cell distribution patterns at each phase of the estrus cycle. The superficial cells predominate (92.43±5.14%) in the estrus phase while significant parabasal cells (87.89±3.09%) predominate in the anestrus phase. The results also showed a significant difference (P<0.05) in vaginal pH which was much more alkaline (8.71±0.25) in the estrus phase while more significantly acidic-normal (6.02±0.26) in the anestrus phase. However, the results showed no difference both in vaginal smear and pH vagina based on pedigree group. Finally, the pattern of superficial cells being more common and vaginal pH levels being higher during estrus may offer a new way to find out when an equine is in estrus.

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Section: Introductionmentioning

confidence: 99%

Estrus detection on different thoroughbred crossbreed horses with vaginal smear and vaginal acidity method

Sitaresmi,

Wulandari,

Hudaya

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Comparative analysis of breeding patterns and reproductive efficiency of mares in subtropical conditions of Pakistan

Mahmood,

Hassan,

Channa

et al. 2024

Veterinary Medicine & Sci

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Background and AimThe present study aimed to evaluate and compare the overall and breed‐specific seasonal breeding patterns, fertility rates, cyclicity, and follicular dynamics of Arab, Thoroughbred, and Percheron mares under the subtropical conditions of Pakistan.Materials and MethodsA retrospective analysis of climatic data and breeding records of eleven breeding studs spanning four years (2020–2023) was made to find out the overall seasonality in the breeding pattern of mares. Fifty mares of each breed (n = 150 in total) were scanned by ultrasonography for a calendar year to find the cyclicity pattern and follicular dynamics (follicular growth rate, size of ovulatory follicle, and days from estrus till ovulation).Results and DiscussionThe statistical analysis of breeding records demonstrated a clear pattern of seasonal breeding (p< 0.05). The highest monthly foalings were noted in March (247 ± 45.37), and overall breeding activities peaked in Spring season (p< 0.05). Breed‐specific results of Arab, Thoroughbred, and Percheron mares revealed that Arab mares maintained stable breeding activity throughout the year, with the highest activity in spring and peak conception rate in winter (56.25% ± 32.78; p > 0.05). Thoroughbred mares experienced significant seasonal declines from spring to winter with a peak conception rate in winter (63.89% ± 27.37, p > 0.05). Percherons showed the most pronounced seasonal effects, especially with a high fall conception rate (73.04% ± 19.61) and a sharp decrease in winter breeding metrics (p< 0.05). Furthermore, Thoroughbred and Percheron mares displayed the most pronounced seasonal effects on the percentage of cyclic mares 77.3% and 56% in winters (p< 0.05). Moreover, the follicular dynamics of the three breeds also exhibited significant differences (p< 0.05).ConclusionThe current study concludes that seasonal and breed‐specific variability exists among the reproductive parameters of Arab, Thoroughbred, and Percheron mares in subtropics, necessitating breed‐specific reproductive management measures to maximize mare breeding efficiency.

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Effect of method and media type for in vitro fertilization on equine (Equus ferus caballus) embryo development

Aryan,

Mardenli,

Groza

et al. 2023

VET GLASNIK

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Demonstrating the role of in vitro fertilization in the equine family, the current study aimed to monitor the rates of equine in vitro-fertilized and cleaved oocytes based on microdroplet and intracytoplasmic sperm injection (ICSI) methods. The fertilization process was carried out in four main media consisting of Tyrod?s albumin lactate pyruvate and TCM-199 (1:1): F (TCM-199); assigned for the ICSI method, FI (contained 0.01 mg/ml heparin + 0.01 ng/ml hypotaurine), FII (contained 0.3 mg/ml calcium chloride + 0.1 mg/ml magnesium chloride) and FIII (contained 0.05 mg/ml hypotaurine-epinephrine). The results indicated an increase in the fertilization rate by the ICSI method (65.71%) compared to the microdroplet method (39.25%) (p 0.04). The rates of unfertilized and degenerated oocytes in the ICSI method decreased, compared to the microdroplet method, to 8.57% and 25.72%, respectively; p< 0.001. The rate of fertilized oocytes in the FI medium increased to 47.61% (p< 0.05) compared to oocytes of FII and FIII treatments (37.64% and 30.00%, respectively). On in vitro culture, the rate of cleavage increased to 74.62% in the CI medium (SOF) compared to those in the CII medium (DMEM-F12) (61.29%); p <0.001. Zygotes cultured in the CII medium achieved a higher rate of blastocyst formation (30%) compared to those in the CI medium (26.31%); p< 0.001. Applying the ICSI method and SOF culture media led to high yields of equine embryos.

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Environmental effects and repeatability of the follicular diameter in mares

Cited by 4 publications

References 10 publications

Estrus detection on different thoroughbred crossbreed horses with vaginal smear and vaginal acidity method

Estrus detection on different thoroughbred crossbreed horses with vaginal smear and vaginal acidity method

Comparative analysis of breeding patterns and reproductive efficiency of mares in subtropical conditions of Pakistan

Effect of method and media type for in vitro fertilization on equine (Equus ferus caballus) embryo development

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