Improvement of Estrus Synchronization Programs of Beef Cattle under the Semi-grazing and Half House Feeding in Agricultural Areas
To study and optimize the effects of different estrus synchronization schemes on the reproductive con-ception rate of beef cattle.The simultaneous estrus schemes of Ovsynch method,secondary PG method,CIDR+PG method,CIDR+PG+GnRH method were used to treat the Charolai cattle,Xinjiang brown cattle,Simmental cattle and related hybrid cattle in a semi grazing and semi house feeding model.The pregnancy diagnosis of the cattle was performed by rectal palpation and ultrasound examination after AI in half grazing feeding mode Ovsynch method.Based on the statistical analysis of conception rate by combining PG dose and BCS,it was found that there was a significant difference in conception rate between the Ovsynch group and the secondary PG group compared to the CIDR+PG group and the CIDR+PG+GnRH group(P＜0.05).In the cattle herd treated with CIDR during the same period,the BCS＜3 group had a significant difference in conception rate compared to the other three groups(P＜0.05).The difference in conception rate between the BCS≥8 group and the other three groups was signifi-cant(P＜0.05).These results indicated that different estrous synchronization programs had significant effects on cattle conception rate,while BCS also had some effects on conception rate.This research provided a reference for the selection and improvement of estrus synchronization programs for beef cattle under the condition of semi-graz-ing and semi house feeding modes.
beef cattlesemi-grazing and semi house feedingestrus synchronization programconception rate
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