黒毛和種牛の発情同期化におけるprogesterone intravaginal device(PRID)の使用

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  • The use of a progesterone releasing intravaginal device (PRID) on synchronization of estrus in Japanese black cattle.
  • 黒毛和種牛の発情同期化におけるprogesterone intravaginal device(PRID)の使用(英文)
  • クロゲワシュ ウシ ノ ハツジョウ ドウキカ ニ オケル progestero

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Progesterone releasing intravaginal device (PRID) with or without the estra-diol benzoate (E.B.) capsule was used for synchronization of estrus and improvement of the subsequent fertility in Japanese Black cattle. PRID was inserted into the vagina for 12 days in 12 animals; consisting of 8 without the E.B. capsule (group I) and 4 with the capsule (group II). They were administered a single intramuscular injection of 25 mg prostaglandin F2α (PGF2α) 24 h before PRID removal. Six animals received two injections of 25 mg PGF2α 11 days apart (group III) and 7 animals served as control (group IV). All animals were cyclic, but have not conceived by 1-3 services including artificial insemination. Estrus was examined continuously for 5 days after treatment and estrous animals were artificially in-seminated once with frozen-thawed bull semen. Serum progesterone (P) levels on day 20-21 (>2.0 ng/ml), non-return (N.R.) and the rectal palpation (R.P.) 60-90 days after insemination were examined for fertility. A retention rate of PRID for the period of 12 days insertion was 75.0% (9/12). All animals except one in group II showed estrus within 5 days after treat-ment. Mean intervals between the cessation of treatment and the onset of first "standing" estrus were 66±28, 51±14 and 52±9h for groups I, II and III, respectively. The incidence of estrus delayed in animals which lost the PRID and were re-inserted a new PRID during the treatment period. Fertility rates in groups I, II, III and IV were 87.5, 25.0, 82.5 and 80.0% by P level, 62.5, 50.0, 50.0 and 57.2% by N.R. and 62.5, 25.0, 50.0 and 57.2% by R.P., respectively. The results indicate that a combined treatment of a PRID and PGF2α was effective for synchronizing estrus and permitting satisfactory fertility following treatment in Japanese Black heifers and cows which had not conceived.

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