The effect of replacing corn with DDGS in the diet on milk production,milk quality,and rumen fermentation of female cattle
The aim of this experiment is to investigate the effect of replacing corn with DDGS in the diet on milk production,milk quality,and rumen fermentation in female cattle.Select 60 female cattle with the same gestational frequency,similar milk production and lactation days,and randomly divide them into 3 groups,with 20 cows in each group.The control group referred to the"Technical Regulations for Cattle Breeding"(DB62/T 2550-2022)to prepare refined feed,while the other two groups used 30%and 60%DDGS to replace corn in the refined feed.The experiment lasted for 40 days,during which all three groups of female cattle were fed in captivity,freely drinking water,and freely consuming coarse feed.The results showed that:(1)Under the same experimental conditions,there was no significant difference in the average daily milk production of female cattle in each group on the 1st and 10th days(P＞0.05).The average daily milk production of female cattle in the 30%DDGS group on the 20th,30th,and 40th days was significantly higher than that of the control group and the 60%DDGS group(P＜0.05).(2)Compared with the control group,the 30%DDGS group significantly increased lactose rate by 8.60%(P＜0.05),lactoprotein rate by 5.90%(P＜0.05),and total solids by 6.12%(P＜0.05).(3)Compared with the control group,the concentration of ammonia nitrogen,acetic acid,propionic acid,and the ratio of acetic acid to propionic acid in the 30%DDGS group and 60%DDGS group were significantly increased(P＜0.05),while the concentration of propionic acid was significantly reduced(P＜0.05).Conclusion:Using 30%DDGS instead of corn in concentrate feed can increase the milk production of female cattle and improve milk quality and rumen fermentation.
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