低蛋白日粮对奶牛产乳效率、乳品质及碳、氮排放的影响OA北大核心CSTPCD
Effects of low protein diet on milk production efficiency,milk quality,and carbon and nitrogen emission of dairy cows
试验旨在研究氨基酸平衡基础上低蛋白日粮对奶牛产乳效率、乳品质及碳、氮排放的影响.选择60头健康、胎次为2~3胎、泌乳天数80d、产奶量42~43kg/d的奶牛,随机分成2组,分别为对照组(高蛋白组,17.5%CP)和试验组(低蛋白组,16%CP+过瘤胃赖氨酸,过瘤胃率85%,小肠吸收率95%),每组5个重复,每个重复6头奶牛.预试期7d,正式试验期90 d.结果表明,与对照组相比,试验组干物质采食量有上升的趋势,产奶量和产乳效率差异不显著(P>0.05).试验组乳成分中乳糖含量在30 d和60 d高于对照组(P<0.05),乳尿素氮(MUN)含量显著低于对照组(P<0.05),乳脂率、乳蛋白率与对照组差异不显著(P>0.05).试验过程中,试验组牛舍CO2和NH3浓度均低于对照组.研究表明,低蛋白水平的日粮添加过瘤胃赖氨酸可降低碳、氮排放,不影响生产水平和乳品质.
The study was to investigate the effects of low protein diet based on amino acid balance on the milk production efficiency,milk quality,and carbon and nitrogen emission of dairy cows.A total of 60 healthy dairy cows with 2~3 parturients,80 days of lactation,and a milk yield of 42~43 kg were randomly divided into two groups:A control group(high protein group,17.5%CP)and a test group(low protein group,16%CP+rumen lysine,rumen digestion rate 85%,intestinal absorption rate 95%),with five replicates in each group and six cows in each replicate.The preliminary trial period was seven days,and the formal trial period was 90 days.The results showed that compared with the control group,the dry matter intake of the test group had an increasing trend,but there were no significant differences in milk yield and milk production efficiency(P>0.05).Lactose in milk composition of the test group was higher than that of control group at the 30th days and the 60th days(P<0.05),the MUN content of the test group was lower than that of the control group(P<0.05),but there were no significant differences in milk fat percentage,milk protein percentage,and other milk composition between the control group and the test group(P>0.05).During the experiment,the concentrations of CO2 and NH3 in the test group were both lower than those in the control group.The study indicates that the addition of rumen lysine in diets with low protein level can reduce carbon and nitrogen emissions without affecting production level and product quality.
李宏伟;田兰;任亚琼;王文卓;蔡丽;王龙;周娜娜;张巧娥
宁夏广德源农牧开发有限公司,宁夏石嘴山 753000宁夏大学动物科技学院,宁夏银川 750021宁夏华盛牧歌饲料有限公司,宁夏银川 750021平罗县畜牧水产技术推广服务中心,宁夏石嘴山 753000
畜牧业
低蛋白日粮乳成分产乳效率碳、氮排放
low protein dietmilk compositionmilk production efficiencycarbon and nitrogen emission
《饲料研究》 2024 (008)
27-31 / 5
宁夏回族自治区重点研发计划项目"基于低蛋白日粮的高产奶牛精准营养和碳氮减排研发与示范(2022BBF02018)"
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