Evaluation of fertility in Repeat Breeder cows treated with pregnant mare serum gonadotropin (PMSG) and prostaglandin PGF2alfa at mid-luteal phase of estrous cycle [milk cows]
1998
Rensis, F. de | Allegri, M. | Rastelli, G. | Brunoni, S. (Parma Univ. (Italy). Istituto di Clinica Ostestrica e Ginecologica Veterinaria)
English. With the aim to induce oestrous and pregnancy in Repeat Breeder cows, in the present study the PMSG injection during the mid luteal phase of the oestrus cycle, followed 24h later by PGF2alfa, has been utilised. 53 cows and 17 heifers with at least three previous AI (eligible for a fourth service), have been utilised. A cow that had failed to become pregnant after three or more inseminations was not inseminated on the next heat and was placed in the study. At day 9 after the end of the oestrous symptoms the cows were treated i.m. with 1000 u.i. of PMSG and 24h later with PGF2alfa. Cows were artificially inseminated with single insemination at 12h distance from oestrous. There were not effects of heifers or cows, farm, veterinarian (n=3), number of inseminations before treatments. All cows showed estrous symptoms after prostaglandin. Pregnancy rate has been 71% with 56% of cows farrowing a single health calf, the 27% a double twins and 14% single or multiple immature calfs. This preliminary study indicates that the PMSG + PGF treatment induces a normal pregnancy in the 41% of treated animals and the incidence of twins is below what can be expected from the treatment with PMSG
Show more [+] Less [-]Italian. Lo scopo del presente lavoro e' stato quello di studiare la fertilita' di bovine Repeat Breeder trattate con PMSG e PGF2alfa. Per questo studio sono state utilizzate 14 manze e 53 vacche di razza Frisona che non sono rimaste gravide dopo 3 o piu'interventi di F.A. Gli animali sono stati trattati 9 giorni dopo l'ultima manifestazione estrale, con 1000 u.i. di PMSG (1000 u.i.) e 24 ore piu' tardi con PGF2alfa (cloprostenolo destrogiro, 150 mg/capo). Le bovine sono state fecondate 12 ore dopo la fine dello stesso con un singolo intervento di fecondazione artificiale. La percentuale di gravidanze e' stata del 71%, delle quali il 56% hanno partorito un singolo vitello, il 27% due gemelli, il 14% hanno abortito vitelli singoli o gemelli prematuri
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