Effect of lysine on production performance and milk composition in dairy cows

Select 12 heads of Holstein cows with similar milk yield and delivery time, using a single factor 3 level 4 repeat random design, compare the addition of homemade lysine 0 (control) 0.4% in the concentrate mixture. And the feeding effect at the three levels of 0.6%, the core material coated with lysine is L-lysine hydrochloride. fL2 China Feed Industry Information Network - based on feed, serving animal husbandry

The test period is 66 days, of which the pre-test period is 10 days. The daily milk yield is measured every three days during the test period, and the noon milk sample is taken every 2 weeks to determine lactose, milk fat, milk protein and milk fat solids, concentrate mix. Using the current formula of the test site, the amount of concentrate supplied is calculated according to the previous day's milk yield using the following formula: concentrate (kg) = 3 kg (maintain) + 0.265-0.32x milk production the day before ( kilogram). fL2 China Feed Industry Information Network - based on feed, serving animal husbandry

The results showed that the addition of lysine to promote the milk production and improve the quality of milk, the average daily milk yield and 4% milk fat corrected milk yield, milk production, milk protein, milk fat, lactose and total solids content. It was best to add 0.6% of the coated lysine group, wherein the daily average milk yield and the 4% milk fat corrected milk yield were 6.8% and 10.8% higher than the control group, respectively. fL2 China Feed Industry Information Network - based on feed, serving animal husbandry