Effects of Dietary Biotin Supplement on Performance and Blood Parameters in Lactating Cows

【Objective】The experiment was conducted to study the effect of bamboo extract on the production performance and physiological function of cows and to seek a suitable proportion of supplement.【Method】Nine health Chinese Holstein cows,blocked by similar lactation days,birth order,and milk yield,were designated into treatments by random with three cows per treatment group according to a replicated 3×3 Latin square design.The cows in group A were fed the basal diet and the cows in other groups were fed the basal diet supplemented with 30g/d(Group B) and 60g/d(Group C) bamboo extract,respectively.【Results】The results showed that daily milk yield was not affected significantly by bamboo extract supplementation(P0.05).Milk fat percentage in group C was 10.55% and 7.35% higher than that of group A(P0.01) and B(P0.05),respectively,and milk protein percentage was 4.00% higher than that of group A(P0.05);Compared with Group A,fat correct milk,milk dry matter percentage and non fat solid in Group C increased extremely significant(P0.01).Serum triglyceride,total cholesterol and LDL-C concentration in group C decreased extremely significant than that in group A(P0.01),and whole blood zinc and serum HDL-C concentration in group C increased significantly than that in group A(P0.05).【Conclusion】Results of the present study indicated that dietary supplemented with 60 g/d bamboo extract could improve the milking yield and milk quality effectively and optimize the metabolism in vivo of Holstein cows.