The aim of this study was to evaluate the effect of Altrenogest (trade name ALTRESYN®) as a method for synchronization of estrous in gilts. The
synthetic progesterone Altrenogest was fed daily to 123 nrs. gilts at 20 mg/gilts for 18 days. Gilts were checked for oestrus twice daily and were artificially
inseminated. One hundred and seven gilts came in estrous between 3 and 7 days (5,22±1,42) after withdrawal of Altrenogest. The farrowing rate was 74,92 %
and average litter size was 12,06. The piglet index was 903,53. Altrenogest, the active ingredient in ALTRESYN® is effective for regulating the estrous of cycling
gilts in commercial pig farms.
S. Dimitrov, G. Bonev, Hr. Taseva