THE EFFECTS OF ESTROUS SYNCHRONIZATIONS BY USING PGF2α ON THE CONCEPTION RATE ON BRAHMAN CROSS COWTRINIL SUSILAWATI, MUHAMMAD RIZKI FAUZI, SUYADI, KUSWATI AND AULIA PUSPITA ANUGRA YEKTIAbstract The objective of this study is to determine the effect of injecting prostaglandin F2 alpha (PGF2α) on the duration of estrous appearance and the success of AI on Brahman cross cow (BX). The material used in the study was 40 Brahman Cross (BX) female cows with PGF2α treatment and 40 female BX cows without injection of PGF2α as a control. The materials in this study were synthetic hormone PGF2α with Lutalyse brand with a dose of 5 mL on a single dose injecting method. The observation results showed the appearance of oestrus sign after PGF2α injection most rapidly occurred at the 27th hour and the slowest appearance occurred at the hour 69th. The average appearance of signs estrous after PGF2α injection most occur at the 30thhour with the number of 21 head Livestock 52.50% of the population. The results of this study showed that from 40 cows with injection of PGF2α as many as 21 heads (53%) Non Return Rate, whereas from 40 cows without injection of PGF2α there were 25 head (63%) of cattle that non return Rate 1.However after 3 months examination of pregnant using rectal palpation, showed that cows who injected PGF2α with 3 head (7.5%) are pregnant, whereas cattle without injection PGF2α only 5 head α (12.5%) are pregnant.
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