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Online Journal of Veterinary Research

Volume 23 (5):431-440, 2019.

Effects of CERC protein on energy and nitrogen status in Holstein cows during late pregnancy and lactation.


Vahid Shirani1*, Ali Mohareri1, Mohammad Khorvash2, Hossein Mehraban1


1 Department of Animal Science(s), Faculties of Agriculture, Shahrekord University, Shahrekord, 2 Isfahan University of Technology, Isfahan, Iran.




Shirani V, Mohareri A, Khorvash M, Mehraban H., Effects of CERC protein on energy and nitrogen in Holstein cows during late pregnancy and lactation, Onl J Vet Res., 23 (5):431-440, 2019. We report effects of CERC protein supplement on energy and nitrogen status from late pregnancy to lactation in Holstein cows. Groups of 6 cows each were fed basal diet with or without CERC 21 days before and 70 days after parturition. Compared with controls (P < 0.05), before partus (8 days), in cows given CERC, metabolizable energy, lactation and energy lost in urine increased. Similarly, nitrogen produced and excreted was greater in those given CERC supplement. However, after parturition (10 or 40 days), energy increased in cows given CERC. These cows also had higher ingested, generated, urine and microbial nitrogen. After partus, in cows that had calved 2-3 times, energy production was higher in those given CERC. By 70 days after parturition, milk and microbial nitrogen was higher in second calvings. Results suggest that CERC protein supplement may improve performance of Holstein dairy cows during the pregnancy to lactation transition.


Keywords: CERC protein, Transition period, Metabolic energy, nitrogen, Holstein cows, Raw data provided.