1997, Number 4
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ABSTRACTThe objective of the present study was to evaluate different treatments for oestrus synchronization in gilts and sows. The study was divided in two experiments. In the first experiment, three different treatments were evaluated in gilts. Each experimental group included 30 animals (Group 1, normal management; Group 2, Altrenogest and Group 3, a vasectomized male). The second experiment evaluated two different treatments in sows; two groups of 30 sows each were tested and compared (Group A, normal weaning and Group B, Altrenogest). Results in the first experiment showed that the Altrenogest group produced a significant increase of synchronized gilts and oestrus presentation (P ‹ 0.05). However, no statistical differences (P › 0.05) were found when age average at presentation of fertility, born alive piglets, born dead piglets and mommies were compared. In the second experiment, normal weaning exhibited better results (P ‹ 0.05) than Altrenogest. However, no statistical differences were observed when lactation period, weaning piglets, fertility, born alive and dead piglets were compared (P › 0.05) Therefore, Altrenogest induces oestrus synchronization in gilts and consequently, a reduction in the female reproductive cycle. However, the use of exogenous products in sows or sophisticated management can be avoided when standard management in the reproductive efficiency takes place.
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