Effect of artificial insemination and natural service on calf sex ratio in dairy cattle

The objective of this study was to determine the effect of artificial insemination and natural mating on secondary sex ratio. data consisting of 259 birth records were provided in the analysis. in artificially inseminated cows,123 births were recorded,of which 56 were females and 67 were males. in cows through natural service,there were 136 calves,in total with 62 females and 74 males. with respect to breed group there were 27 calves (12 females,15 males) from indigenous,123 (56 females,67 males) from indigenous × jersey (f1),54 (26 females,28 males) from f1× f1(f2) and 55 (24 females,31 males) from f1 × friesian cows. factors affecting the logic of the probability of a male calf being born were determined using chi square analysis. type of mating (i.e.,natural or artificial insemination) and,breed of service sire did not significantly (p>0.05) affected the likelihood of a male calf being born. © 2015,pakistan academy of sciences.