The Effects of Graded Abomasal Glucose Infusion on Milk Yield and Composition in Lactating Goats

Abstract Four non-pregnant multiparous lactating goats were used in a 4 × 4 latin square experiment in the present study. The four treatments were abomasal infusion of 0, 50, 100, and 150 g d −1 glucose. The results showed that graded glucose infusion increased milk yield ( P −1 glucose was infused. An infusion of glucose at 100 or 150 g d −1 failed to increase milk yield further and milk yield of the 100 g d −1 glucose infusion treatment was even significantly lower than that of the 50 g d −1 treatment ( P −1 treatments were lower than that of the control ( P −1 treatment was not depressed and was higher than that of the control ( P P P P P −1 treatment were higher than those of the control but had no difference among the other three treatments. Contents of those de novo synthesized fatty acids in milk fat remained unchanged or increased and those preformed fatty acids remained unchanged or decreased by graded glucose infusion. Glucose infusion decreased the total yields of C16 + C16:1 and > C16 fatty acids and had no influence on the yield of C4-C14:1 fatty acids ( P