National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The present study was conducted to compare the conception rates following breeding at foal heat versus induced heat in postpartum indigenous mares. Twenty mares with history of normal foaling and expulsion of placenta and occurrence of foal heat between 6-10 days after foaling were included in the study. These mares were subjected to transrectal ultrasonography during foal heat to record uterine oedema, accumulation of fluid and endometrial thickness. These mares were randomly divided into 2 groups (n = 10 in each).Group I mares were bred naturally during first estrus postpartum (Foal heat) whereas, in group II, breeding during foal heat was skipped. On day 28 postpartum, group II mares received synthetic PGF2α (Cloprostinol) @ 500 µg followed by covering with fertile stallion on induced estrus twice at 36 hrs interval. Mean±SEM uterine oedema grade during foal heat was significantly higher (P<0.05) as compared to during induced heat (4.5  0.08 vs 2.3  0.1). The endometrial thickness during foal and induced heat was 6.2  0.1 mm and 5.03±0.16 mm, respectively. The intrauterine fluid accumulation was observed in 70 % (14/20) mares during foal heat (P<0.05) versus only 20% (2/10) during postpartum induced heat. Mean±SEM diameter of dominant ovulatory follicle in group I and II were 31.8±0.75 and 31.0 ±0.55 mm, respectively. The first service conception rate in group I and II was 20% and 80 % (P<0.05), respectively. The natural breeding during induced heat yielded higher conception as compared to foal heat breeding which may be attributed to accumulation of intrauterine fluid during foal heat in postpartum mares.
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