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- Title
Sincronización de la ovulación y tasas de preñez en vaquillonas lecheras tratadas con protocolos que prolongan el proestro.
- Authors
Ré, M. G.; Racca, G.; Filippi, L.; Veneranda, G.; Bó, G. A.
- Abstract
The technique of timed artificial insemination (TAI) has been transformed into a tool to standardize the reproductive management of commercial beef and dairy herds. It has recently been shown an increase in pregnancy rates to TAI in dairy heifers using protocols that reduce the period of insertion of the device and prolong the proestrous period, called 5-day Co-Synch protocols. In South America, TAI protocols used mainly estradiol benzoate (EB) and progesterone devices. The J-Synch protocol is a protocol that uses estradiol and progesterone devices in which the device insertion period is reduced to 6 days and the proestrous period is prolonged by administering GnRH and perforoming the TAI at 72 hours after removal of the progesterone device. This protocol is presented as an interesting option for its practicality of implementation and the results are very encouraging in terms of pregnancy rates. The aim of this study was to compare the J-Synch protocol with the 5- day Co-Synch protocol (both have prolonged proestrus) to the conventional protocol (short proestrus), one of the most widely used TAI protocols in South America. The results confirm that the J-Synch protocol presents a proestrus that was, on average, 21 hours longer than the conventional protocol. Although, pregnancy rates were not significantly different between protocols, pregnancy results were higher in the J-Synch protocol than in the conventional protocol in all replicates performed. The J-Synch treatment was efficient to synchronize ovulation in dairy heifers and in addition, its application is practical because it requires to manage the animals only three times.
- Subjects
ARTIFICIAL insemination of cattle; HEIFERS; PROGESTERONE; PREGNANCY in animals; ESTRADIOL benzoate
- Publication
Taurus, 2021, Vol 23, Issue 91, p28
- ISSN
1515-3037
- Publication type
Article