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KMID : 0900919900140030175
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Korean journal of Animal Reproduction
1990 Volume.14 No. 3 p.175 ~ p.182
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Behavioural Estrous, Short Estrous Cycles and Serum Level of Estradiol-17beta durig Peri-Estrus following Superovulation Treatments in Korean Native Goats
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Abstract
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Behavioural estrus and short estrous cycles were observed and serum concentrations of estradiol-17beta(E2) before and after of estrous were measured following superovulation treatments in 30 pluriparous Korean native goats. The goats were divided into 2 groups. Fifteen goats were injected IM with 1,000IU PMSG on Day 12 of the estrous cycle followed by 10mg PGF2alpha 48h later(P4＋PMSG), and the other 15 goats were injected IM with 10mg progesterone(P4)in oil once daily for 10d beginning at any days of estrous cycle followed by 1,000IU PMSG and 10mg PGF2alpha at the 8th day of progesterone treatment(P4＋PMSG group). After injection of PGF2alpha, onset of standing estrus occurred in 12 of 15 goats(80.0%) at 50.0pm7.7h and in 11 of 15 goats(73.3%) at 135.6pm10.1h in PMSG and group and P4＋PMSG group, respectively. The mean interval from PGF2alpha injection to first estrus was significantly(P<0.01) earlier in PMSG group than in P4＋PMSG group. This result indicate that the delayed infusion of P4 in P4＋PMSG group caused the later exhibition of their estrous behaviors. However, duration fo frist estrus(31.5pm2.6h vs 26.2pm2.3h), length of estrous cycle(14.1pm3.3d vs 16.6pm3.8d) and percentage of short estrous cycle(50.0% vs 45.5%) were not different between PMSG and P4＋PMSG group. The mean concentration of serum E2 in 4 goats showing normal estrous cycle in P4＋PMSG group(PP-NEC) was higher than in 6 goats showing normal(P-NEC) or in 6 goats showing short estrous cycle(P-SEC) in PMSG group. The peak level of serum E2 was observed at the time of onset of standing estrus in PP-NEC(67.6pg/ml), 6h earlier in P-NEC(53.1pg/ml) and 6h later in P-SEC(52.3pg/ml) than the onset of standing estrus. The profiles of serum concentration of E2 during the period of peri-estrus was similar in the goats of PMSG or P4＋PMSG and also in the goats showing the subsequent estrous cycle of normal or short length.
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