Abstract: The objective of this study was to investigate whether consuming of protected glutamine before and after parturition would affect biomarkers of oxidative stress, dry matter intake and production performance. Thirty six pregnant Holstein dairy cows were assigned into four treatment groups based on their BCS, parity and expected calving date in a completely randomized design. Treatment groups consisted of glutamine supplementation Before and After Calving (BFAF), glutamine supplementation before calving and without glutamine after it (BFAN) without glutamine before and glutamine supplementation after calving and (BNAF) and without glutamine pre and postpartum (BNAN). There were not any significant differences and interaction among treatments in DMI but DMI on days 21 was affected by post partum glutamine feeding. Milk yield was not affected by treatments. The Total Antioxidant Status (TAS) influenced by postpartum glutamine feeding and was most for BFAF and BNAF. The Plasma Glutathione Activity (PGA) was affected by pre and postpartum treatments and the effect of post calving feeding was more clear and there was only an interaction effect on 7 days.
T. Tanha, H. Amanlou, M. Chamani, Y. Ebrahimnezhad, R. Salamatdost, N. Maheri and M. Fathi, 2011. Effect of Glutamine Enhancement on Oxidative Stress and Reproduction in Holstein Dairy Cows During Transition Period. Journal of Animal and Veterinary Advances, 10: 2838-2845.