Comparison of production and reproduction performance of dairy cows fed lipogenic or glucogenic diets during prepartum period

The effects of lipogenic nutrients in a prepartum diet on production، reproduction and metabolic performance of cows in subsequent lactation period were studied. Twenty four pregnant multiparous cows were assigned randomly to 2 treatments in a completely randomized design. Cows were fed either a lipogenic diet (Lipogenic group) or a glucogenic diet (Glucogenic group) from week three prepartum and thereafter all cows were fed a similar glucogenic diet until 8 weeks postpartum. All cows were fed total mixed ration (TMR) ad libitum and were kept in individual stalls. Dry matter intake، body condition score، milk yield، milk composition and energy balance of animals were not affected by prepartum diet. Serum cholesterol and NEFA concentrations in Lipogenic group were significantly (P<0. 05) higher than those in Glucogenic group both during pre and postpartum periods. Prepartum diets had no significant effect on follicular populations in different classes. However، during the first 100 days in milk، the percentage of pregnant cows in Glucogenic group was about 14% higher، numerically. Results of this study confirmed relatively a positive effect of prepartum glucogenic diet on metabolic status and to some extant pregnancy rate.