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- W2003158966 abstract "Estrus was synchronized in 30 mature Yankasa ewes using progestagen pessaries containing 45 mg Flugestone acetate. Animals were divided into five equal groups and treated, at sponge withdrawal with 0, 250, 500, 750 and 1000 IU PMSG (i.m.). Estrus detection was conducted and plasma samples collected every other day for progesterone determination. Ovulation rates were determined by counting the number of corpora lutea on each ovary using a mid-ventral surgical approach. Intervals from sponge withdrawal to onset of estrus (h) were 44.5±4.5 (0 IU), 32.9±1.7 (250 IU), 37.8±1.1 (500 IU), 26.9±3.2 (750 IU) and 27.1±2.6 (1000 IU). Mean durations of estrus (h) were 25.0±0.6 (0 IU), 61.3±3.9 (250 IU), 12.0±4.5 (500 IU), 49.9±7.0 (750 IU) and 44.5±11.7 (1000 IU). Ovulation rates (based on number of corpora lutea) averaged 1.0±0.0, 1.3±0.3, 2.0±0.0, 5.5±0.5 and 7.0±1.2 for ewes treated with 0, 250, 500,750 and 1000 IU PMSG, respectively. Post-synchronization estrous-cycle lengths increased linearly due to PMSG treatment and were 16.5±0.5, 17.0±0.6, 18.0±0.6, 19.5±0.5 and 23.8±0.3 days for ewes treated with 0, 250, 500, 750 and 1000 IU PMSG, respectively. Plasma progesterone concentrations also showed significant treatment effects being dose dependent. Total progesterone concentrations were 15.3±2.5 (0 IU), 36.6±10.9 (250 IU), 56.1±7.7 (500 IU), 82.2±5.6 (750 IU) and 125.7±9.0 (1000 IU) (ng/ml). The results indicate the possibility to increase ovulation rates in Yankasa ewes with PMSG and to establish a direct relationship between PMSG dosage, ovulation rate and plasma progesterone concentrations." @default.
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- W2003158966 date "1989-10-01" @default.
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- W2003158966 title "Effect of dose of pregnant mare serum gonadotrophin on estrus parameters, ovulation rate and peripheral progesterone concentrations in Yankasa ewes" @default.
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- W2003158966 doi "https://doi.org/10.1016/0378-4320(89)90074-2" @default.
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