Abstract

A study was conducted to assess the influence of omega-3 rich fatty acid enriched feed on biochemical markers and postpartum reproductive performance of crossbred dairy cows. Twenty four pregnant crossbred cows were randomly divided into two groups of 12 cows each. Cows in group 1 (control) were fed with standard NRC ration plus 600g molasses while cows in group 2 (treatment) were fed with standard ration plus crushed flaxseed (omega-3 FA source) 750 g/head/day from one month before the due date of parturition till one month after parturition. Results revealed that the biochemical markers like plasma concentration of prostaglandin F metabolite (PGFM), insulin like growth factor-1 (IGF-1) and progesterone concentration were significantly (p<0.01) higher in feeding a source of omega-3 fatty acid as compared to control diet. Conception rate was significantly (p<0.01) higher (58.30 vs 33.33%) and embryo mortality was significantly (p<0.01) lower in supplemented cows compared to control cows (14.30 vs 50.00%). In conclusion these data demonstrated the positive effect of omega-3 fatty acid supplementation on reproductive performance. However, more studies need to be undertaken to confirm these results as well as a mechanism of action involved at the molecular level. 

Keywords : Conception rate, Embryonic mortality, Omega-3 FA, PGFM, Progesterone