Effects Of Bamboo Extracts On Performances And Blood Biochemical Parameters In Late-Lactating Cows

The experiment was conducted to research the effects of bamboo extract additives on performances and blood biochemical parameters in late-lactating dairy cows and seek the optimal additive dose.(Bamboo extracts were originated from the final products by extraction, fermentation and desiccation of the bamboo fiber wastes).Nine health adult Chinese Holstein cows, blocked by similar ages, lactation days, birth order, body weights and milk yield, were designated into treatments at random with three cows per treatment group according to a replicated3×3Latin square design. In these3groups, group A was the control group, the cows in which were fed the basal diet and the cows in other groups were fed the basal diet supplemented with30g d-1(Group B) and60g d-1(Group C) bamboo extract, respectively. The whole trial period included75days, divided into3periods,25days per period. The first7-day of each period was preparatory feeding period, and the formal feeding period included18days. The last3-day was the sampling period. Measuring the all-day milk yield and DMI by continuous recording during the first2-day in the sampling period, and then collecting the milk samples in the middle stage of lactation period uniformly, mixed to50ml at the radio of3:2:2(according to sampling volume in the morning, midday and evening). At the last day, the blood samples were collected by cervical vein to experiment cattle, including the whole blood samples were5ml each group in the heparin anticoagulation tube and the serum samples were not less than5ml each group originated from30ml whole blood samples by stand, centrifugation, extraction and preparation. All of milk and blood samples were for analysis in the laboratory.The results showed that DMI and daily milk yield was not affected significantly by different levels of bamboo extract supplementation (P>0.05). In the index of daily milk yield, there were20.44kg in group A,20.80kg in group B,21.37kg in group C. There was a upward trend with the improvement of levels of bamboo extracts. In the index of4%FCM, the experimental group C the highest4%FCM yield of24.00kg, compared with the control group A the lowest4%FCM yield of21.54kg significant increased11.42%(P<0.01). The experimental group B4%FCM yield of22.33kg between both of group A and group C.About quality of the milk, the milk fat percentage in group C separately significant increased about10.55%(P<0.01) and7.35%(P<0.05) than group A and B, and the milk protein percentage in group C was increased about4.00%(P<0.05) than group A. Moreover, the milk dry matter and NFE in group C were higher than in group B (P<0.01). The milk lactose percentages were no significance difference among the groups (P>0.05).In the aspect of blood trace elements, the concentration of blood Zn in group C was increased about8.83μmol L-1(P<0.05) in group A and6.28μmol L-1(P>0.05). The other blood trace elements were no significance difference among the groups (P>0.05).In the aspect of serum ions, the concentration of serum Ca in group C was separately increased about0.38mmol L-1(P<0.01) and0.26mmol L-1(P<0.01). There were no significance difference between group A and group B (P>0.05). Moreover, serum K, Na, Cl and P were no significance difference among the groups (P>0.05). In the biochemical parameters, the concentrations of TC, TG and LDL-C in group C were significant lower than the control group A (P<0.01). The concentration of TC, TG and LDL-C in group B between group A and C were significant differences (P<0.05) respectively. The concentration of HDL-C in group C was significant higher than the control group A (P<0.01). The concentration of HDL-C in group B were between group A and C, and no significant differences (P<0.05). The concentration of serum T-BIL in group C was separately significant decreased about0.50U L-1(P<0.05) and0.47U L-1(P<0.05). In other biochemical parameters, such as, GLU, TP, ALB, GLB, ALB, ALT, AST, LDH, Urea, Cr, CK, UA, GPDA, GGT, AMY and T-BIL. All of them were existed certain difference, which were considerably large and no significant differences among the groups (P>0.05).The result indicated that dietary supplemented with the bamboo extract as the additives in late-lactating dairy cows, to some extent, could improved the milking performance reasonably and efficiently, then kept putting off milk yield trend, and played some roles that improved milk quality of them effectively, enhanced physiological function of the late-lactating cows and optimized metabolism in vivo of Holstein cows, as a result, it was to be more valuable for popularization and application for dairy cattle feeding. In this experiment, the best proportion of level of bamboo extracts was60g d-1, and the effects were relatively obvious.