Effects of dietary supplemented with fermented sorghum on growth performance,lactation performance and economic benefit of dairy cows
This experiment was conducted to investigate the effects of fermented sorghum supplementation on growth performance,lactation performance and economic benefits of dairy cows.Eighty Holstein dairy cows with similar parity(3.2±0.6),lactation performance and body weight(610±48.73)kg were randomly divided into 4 groups with 1 group for every 5 replicates and 1 replicate for every 4 cows.Whole silage corn in the basal diet was replaced by 0%,6%,12% and 18% fermented sorghum,respectively.The experiment lasted for 8 weeks.The results showed as follows:under the premise of no significant effect on ADMI(P＞0.05),the milk yield of cows in the whole corn silage group replaced by 18% fermented sorghum was significantly decreased by 4.35%,3.95% and 3.67% compared with the other groups,respectively(P＜0.05).The milk protein rate was significantly decreased by 8.75%,9.80% and 10.06% (P＜0.05),respectively.In addition,fermented sorghum had no significant effects on milk total solid content,milk fat percentage,lactose percentage and 4% FCM(P＞0.05).The contents of aspartic acid,lysine and histidine in milk of 18% fermented sorghum group were significantly decreased(P＜0.05);The contents of arginine and phenylalanine in milk of 12% and 18% fermented sorghum groups were significantly decreased(P＜0.05);The contents of valine and tyrosine in milk of 6% to 18% fermented sorghum group were significantly decreased(P＜0.05).In this experiment,all the milk was sold according to the market price of 4.17 yuan/kg,and with the increase of fermented sorghum supplemental level,the dietary prices were 2.81,2.77,2.73 and 2.69 yuan/kg,respectively.Therefore,the gross profit of each group is 3164.34,3152.07,3204.26 and 3007.87 yuan,respectively.In conclusion,the 18% fermented sorghum group had the worst performance and milk quality,the lowest gross profit,and the best feeding effect at 12% .
NETL
NSTL
万方数据
