Estrus Response Of Boran And Boran-holstein Crossed Cattle To Pgf2 And Pregnancy Rates To Sexed And Conventional Semen Holeta Ethiopia

The study was conducted majorly to evaluate pregnancy rate to sex sorted semen and high grade non sex sorted imported semen in a 2X2 factorial design in Boran and Boran X Holstein cross cows and heifers. The effect of some animal related factors which may affect pregnancy rate and heat characteristics of different breeds and party were evaluated. A total of 71cows/heifers consisting of 36 Boran and 35 Boran x Holstein of which 49 were cows and 22 heifers were purposively selected and synchronized using PGF2, twenty five Boran (69.4%) and twenty seven Boran x Holstein cross (77.1) were responded to PGF2 and exhibited estrus. When response to PGF2 was compared by parity, 65.3% cows (n=32) and 90.9% heifers (n=20) exhibited estrus. Parity has statistically significant (P0.05). Average duration of estrus was significantly longer in Boran x Holstein cross breed than Boran breed. However, average interval to onset of estrus and duration of standing estrus were not significant differ (P>0.05) by both breed and parity. A multivariable logistic regression model including the breed, parity, body condition score, treatment, semen type and their interactions was evaluated. Parity and semen type showed significant variation (P

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