Abstract:

(objective) This study was conducted to evaluate the blood lipid profiles and anti-oxidative stress for lactating cows fed rumen-protected choline (RPC). (Methods) Ten cows in early lactation were used as the experimental animal with self-pair design. Trial lasted for 3 durations of 12 days including control, trial 1, and trial 2, respectively. Each cow was supplemented with a daily dose of 40g RPC. Blood was collected to harvest plasma for measurements of blood lipid profiles and anti-oxidant stress. (Results) Feeding of RPC did not affect plasma glucose, creatinine, and triglyceride levels (P>0.05). However, plasma urea nitrogen was lower for trial 1 and 2 phases than control (P<0.05); and plasma cholesterol in trial 1 and 2 duration was higher relative to control (P<0.05). Compared with control, plasma concentrations of total anti-oxidative capacity, superoxide dismutase, malondialdehyde, and glutathione peroxidase was not altered for RPC supplementation (P>0.05). (Conclusion) These results indicated that, under the present experimental condition, dietary inclusion of RPC is beneficial for protein utilization and blood lipid metabolism, but not for anti-oxidative stress for peak-lactating dairy cows.