The effects of supplementation of rumen-protected choline on some blood and milk metabolites in the transition period of dairy cattle

Authors : Niyazi ALAN, Mustafa SALMAN

Pages : 474-480

View : 20 | Download : 5

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The aim of this study was to investigate nonesterified fatty acid insert ignore into journalissuearticles values(NEFA);, beta-hydroxy butyric acid insert ignore into journalissuearticles values(BHBA);, and milk urea nitrogen insert ignore into journalissuearticles values(MUN); profiles for dairy cows fed with rumen-protected choline insert ignore into journalissuearticles values(RPC); during the transition period. A total of 30 dairy cows were allocated to one control and two experimental groups insert ignore into journalissuearticles values(10 animals per group); and were fed from 3 weeks before calving to 21 days in milk. The control was fed only the basal diet. Treatment groups 1 and 2 were fed a basal diet containing 60 and 120 g/head/day RPC, respectively. The differences between groups were insignificant for MUN levels of colostrum and milk. There were no significant differences insert ignore into journalissuearticles values(P > 0.05); between the groups in terms of serum NEFA or BHBA levels. RPC supplementation did not have a significant effect on energy or protein metabolism of dairy cows during the transition period. The main effects of the periods without group effects in the model were highly significant insert ignore into journalissuearticles values(P < 0.01); for NEFA and BHBA. There is no need to add RPC to rations formulated as isocaloric and isonitrogenic for optimal rumen fermentation in dairy cows during the transition period. To better understand the effect of RPC on dairy cows during the transition period, there is a need for further studies of animals with known metabolic profiles, and those having high milk yields or metabolic disorders.
Keywords : Beta hydroxy butyric acid, nonesterified fatty acid, rumen protected choline, transition period, milk urea nitrogen