The Response of Estrus Synchronisation of Zebu and Zebu Cross Bred Cattle with Single Treatment of PGF2a in Hadiya Zone, Southern Ethiopia

Abstract

A study was conducted to test a simple hormonal oestrus synchronization regime and evaluate the response of Zebu and their cross bred to PGF_2a in Hadiya zone, Ethiopia.Animals treated with single injection of PGF_2a 64% (n=32) of zebu and 70% (n=35) of crossbred ones responded positively and showed standing oestrus with in the interval of 48hrs and 96hrs. The estrus response was 48 hrs (n=3), 72 hrs (n=25) and 96 hrs (n=4) in zebu cattle with mean duration 0.5452^{b, -}0.0393^a, 0.1636^c and  48 hrs (n=10), 72 hrs (n=23) and 96 hrs (n=2) were 0.0000^{b, -}0.03556^a, -0.981^c in cross bred cattle respectively. Parity number was found the significant factor in the study animals. Zero parity (n=17) in Zebu cattle and (n=15) in crossbred highly influenced in the response of estrus in both cattle. The result indicated that as the parity number increased the response rate was decreased in both breeds. Those animals showed standing oestrus were inseminated and 77% (24) of Zebu and 65.5% (n=23) of crossbred conceived. The pregnancy rate 48% (24/32) of Zebu and 46% (23/35) of crossbred were achieved. The conception rate after oestrus synchronistion with cloprestenol was good. Thus on the basis of present findings diagnosis of ovarian structure by means of rectal palpation must be supported by milk or plasma P4 concentration to maximize the efficiency of treatment. Further research is required to evaluate the comparative oestrus synchronization responses and cost of different regimes of Cloprestenol or other prostaglandin and/or combination of GnRH and prostaglandin treatments

Keywords: cross bred cattle, estrumate, and reproducvtive performance.