Synchronization of Estrus by Intramuscular Injection or Intrauterine Infusion of Prostaglandin F2.ALPHA. for Embryo Transfer in Cows.

概要

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The rate and latency of the occurrence of estrus were compared between the PGF2α treatments of intramuscular injection and intrauterine infusion to cows for embryo tranfer. PGF2α (each 10 mg) was injected daily intramuscularly 3 times to 17 donors and twice to 50 recipients. And to 16 donors and 55 recipients, PGF2α(5 mg) was infused into the ipsilateral uterine horn to the ovary bearing the functional corpus luteum using an instrument with a concentric sheath. PGF2α treatments were done 48 hr after the 1st FSH injection. Standing estrus was observed in donors 40 to 48 hr after the PGF2α treatment in 93.8% cows by the intrauterine infusion and 88.2% cows by the intramuscular injection. As for the recipients, standing estrus was induced mainly between 40 to 96 hr after the intrauterine infusion or 40 to 144 hr after the intramuscular injection. If the observational period was limited between 40 to 72 hr, estrus was induced in 87.3% cows by the former treatment or 46.0% cows by the latter treatment. The former was significantly higher (P<0.05). For the synchronization of the occurrence of estrus in cows, the intrauterine treatment with PGF2α using an infusion instrument can be recommended.
日本繁殖生物学会の論文