Effect of supplemented ration on some reproductive traits in Azeri Buffaloes of Iran

Reproduction efficiency is one of the most important factors for productivity and profitably of dairy animals. Late or delayed oestrus in buffalo heifers is one of the major factors limiting its overall productive and reproductive performance. Feeding and general management have been reported to improve reproduction efficiency of buffaloes. Reproduction is partly affected by nutrition supplementation. Thus the objective of this study was to investigate the effect of supplemented ration on some reproductive traits in Azeri buffaloes. One hundred and twenty female buffalo calves with 8 months age were randomly divided into four groups (30 calves in each group). Calves received I) traditional ration (TR) II) TR plus 0.5 kg concentrate III) TR plus 1 kg concentrate IV) TR plus 1.5 kg concentrates till the age at first estrous. There was no difference between initial weights of calves before the treatments. The reproductive traits considered were age at first oestrus, weight at first oestrus, number of oestruses before gestation, age at gestation, age at calving. Although there were no significant differences between the all studied traits among treatments, the supplementation in Group 4 improved the traits somehow; in particular, treatment 4 decreased by 70 days the age at calving compared to treatment 1. This indicates that the W. Azerbaijan buffaloes suffer a nutritional deficiency in their lifetime and that quality /quantity supplementation of ration can improve their reproductive performance