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Postpartum Ovarian Activity and Serum Estradiol‐17beta Level in Thai Crossbred Native Mares
Author(s) -
Panasophonkul S,
Lohachit C,
Sirivaidyapong S
Publication year - 2007
Publication title -
reproduction in domestic animals
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.546
H-Index - 66
eISSN - 1439-0531
pISSN - 0936-6768
DOI - 10.1111/j.1439-0531.2006.00673.x
Subject(s) - foal , ovulation , estrous cycle , crossbreed , medicine , transrectal ultrasonography , palpation , gynecology , zoology , obstetrics , andrology , biology , endocrinology , hormone , genetics , surgery , prostate cancer , cancer
Contents To study the postpartum ovarian activities for investigation of first postpartum oestrus, twenty‐five Thai crossbred native mares were monitored after parturition by oestrous detection, transrectal palpation and reproductive ultrasonography. Blood samplings were also taken for estradiol‐17beta (E 2 ) analysis. The first ovulation occurred within 20 days postpartum in 92% (23/25) of the mares. The mean intervals of foaling to first oestrus and to first ovulation were 10.3 ± 2.9 and 13.4 ± 2.6 days (mean ± SD) respectively. Serum E 2 increased from 7.0 ± 2.9 to a peak of 10.8 ± 3.3 pg/ml (mean ± SD) at 2 days before ovulation. In conclusion, from the study, it can be stated that the postpartum breeding management should be considered after day 10 postpartum by careful examination of ovarian activity with various methods. However, the uterine condition should be also estimated associated with the ovarian activity after parturition which may increase breeding performance and foal production.