Effects of Different Proportions of Brewer's Grains in Diets on Performance,Milk Composition and Rumen Fermentation Parameters of Lactating Buffaloes
This experiment was conducted to investigate the effects of different proportions of brewer's grains on performance,milk composition and rumen fermentation parameters of lactating buffaloes.A total of 42 healthy buffaloes with good body condition,similar lactation period,calving parity and milk yield were ran-domly divided into 3 groups with 14 buffaloes in each group.The proportions of brewer's grains to soybean meal in diets of all groups were 50∶50(group Ⅰ),75∶25(group Ⅱ)and 100∶0(group Ⅲ),respectively.The pre-trial period lasted for 7 days and the experimental period lasted for 30 days.The results showed as fol-lows:1)the dry matter intake of lactating buffaloes in group Ⅲ was extremely significantly higher than that in groups Ⅰ and Ⅱ(P＜0.01),and the milk yield and standard milk yield in group Ⅲ were significantly or ex-tremely significantly higher than those in groups Ⅰ and Ⅱ(P＜0.05 or P＜0.01).2)Dietary brewer's grains had no significant effects on milk density,milk protein rate,milk fat rate,milk total solid content,non-milk fat solid content,milk lactose rate,milk acidity and milk free fatty acid content of lactating buffaloes(P＞0.05).The milk protein and lactose yields in group Ⅲ were significantly higher than those in groups Ⅰ and Ⅱ(P＜0.05),and the milk fat yield in group Ⅲ was extremely significantly higher than that in groups Ⅰ and Ⅱ(P＜0.01).3)The rumen pH and lactic acid content of lactating buffaloes in group Ⅲ were extremely signifi-cantly higher than those in groups Ⅰ and Ⅱ(P＜0.01);the rumen ammonia nitrogen(NH3-N)content was extremely significantly decreased with the increase of dietary brewer's grains proportion(P＜0.01).The rumi-nal acetic acid content in group Ⅲ was significantly lower than that in group Ⅰ(P＜0.05);the rumen contents of propionic acid,butyric acid and total volatile fatty acid(TVFA)in group Ⅲ were extremely significantly or significantly lower than those in groups Ⅰ and Ⅱ(P＜0.05 or P＜0.01);the rumen ratio of acetic acid to pro-pionic acid in group Ⅲ was significantly higher than that in group Ⅰ(P＜0.05).There were no significant differences in rumen ratios of acetic acid to TVFA,propionic acid to TVFA and butyric acid to TVFA among all groups(P＞0.05).In conclusion,considering the dry matter intake,milk yield,milk composition and ru-men fermentation parameters of lactating buffaloes under the experimental conditions,it is better to feed lacta-ting buffaloes with 100％brewer's grains instead of soybean meal,and brewer's grains can be used to replace soybean meal in the diet in actual production.[Chinese Journal of Animal Nutrition,2024,36(6):3702-3712]
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