Milk production, nitrogen excretion and blood biochemical parameter responses to dietary addition of compound yeast cultures in dairy cows

doi:10.11686/cyxb2015124

Abstract

Abstract: This experiment was conducted to determine the effects of compound yeast cultures on the milk production, nitrogen excretion and blood biochemical parameters of dairy cows. A total of 24 Holstein lactating cows with similar parity, weight, milk yield and lactation stage (135±15 day in milk) were equally assigned to four groups, including one control group and 3 treatment groups, with dietary supplementation of compound yeast cultures at concentrations of 0, 0.8%, 1.0% and 1.2%, respectively. Milk yield, milk composition, nitrogen excretion and blood biochemical parameters of each cow were recorded. The results showed: 1) The cows in the respective treatment groups had 8.48%, 10.05%, 8.97% higher daily milk yield than cows in the control group (P<0.05). 2) Compound yeast cultures significantly increased milk fat and protein concentration (P<0.05), and reduced somatic cell counts (P<0.05), with treatment group 2 again the greatest response. 3) The supply of compound yeast cultures in dairy cow feed concentrate reduced nitrogen excretion by 8.47%, 12.01%, 9.36% compared to the control group (P<0.05). 4) Dietary supplementation with compound yeast cultures significantly increased the levels of glucose (GLU), total protein (TP), globulin (GLOB), and insulin (INS) (P<0.05) in the serum, and reduced blood urea nitrogen (BUN) (P<0.05). Based on the data for milk yield, milk composition, nitrogen excretion and blood biochemical parameters, the optimal concentration of compound yeast cultures administered as a supplement for dairy cow diets is 1.0%.

WANG Ling, LV Yong-Yan, CHENG Zhi-Wei, DU Gao-Tang, LI Jin-Lin, FU Shi-Jun, SUN Guo-Qiang. Milk production, nitrogen excretion and blood biochemical parameter responses to dietary addition of compound yeast cultures in dairy cows[J]. Acta Prataculturae Sinica, 2015, 24(12): 121-130.

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