摘要
试验采用六氟化硫(SF_6)示踪技术测定生产条件下泌乳奶牛瘤胃甲烷排放量,旨在研究饲粮NDF/NFC(中性洗涤纤维/非纤维性碳水化合物)对泌乳中期奶牛甲烷排放量、营养物质表观消化率和生产性能的影响。试验选用体重(649.54±18.44)kg、胎次(1.42±0.15)胎、泌乳天数(170.08±19.04)d、产奶量(18.46±0.89)kg/d的荷斯坦奶牛12头,随机分配到3组,每组4头。各组饲粮NDF/NFC分别为1.44、1.65、1.82。试验期为28 d,包括14 d预饲期和14 d正试期。结果表明:①泌乳中期奶牛瘤胃甲烷排放量、甲烷能、甲烷/干物质采食量及甲烷能/总能摄入量在3个处理组间均有极显著差异(P<0.01);②低NDF组NFC的表观消化率显著高于高NDF组(P<0.05);③生产性能和日增重在3组间无显著差异(P>0.05)。综上,在不影响奶牛健康和生产性能的前提下,NDF/NFC为1.44的低NDF组饲粮能显著降低泌乳中期奶牛瘤胃甲烷排放量。
Methane emissions from lactating cows under production condition were determined by sulfur hexafluoride (SF6) tracer technique in order to study the effects of dietary NDF/NFC(neutral detergent fiber/non-fiber carbohydrate) on rumen methane emission,nutrient apparent digestibility and production performance of dairy cows during middle lactation period.Twelve Holstein lactating cows were selected with body weight(649.54±18.44) kg,parity(1.42±0.15) parities,lactating days(170.08± 19.04)d and milk yield(18.46±0.89)kg/d and were randomly allocated to 3 groups with 4 lactating cows in each group.Dietary NDF/NFC was 1.44,1.65 and 1.82.The whole experiment lasted for 28 d with 14 d of pre-test and 14 d of test.The results showed that:① there was highly significant difference (P<0.01) in rumen methane emissions,methane energy,methane/DMI,and methane energy/GEI among the 3 groups.② The apparent digestibility of NFC in low NDF group was significantly higher than that in high NDF group (P<0.05).③ There was no significant difference (P> 0.05) in production performance and average daily gain among the 3 groups.In conclusion,without affecting the health and production performance of dairy cows,low NDF group with NDF/NFC of 1.44 could significantly reduce rumen methane emissions during middle lactating period of dairy cows.
作者
王贝
李斌昌
董利锋
许贵善
贾梦可
侯长乐
刁其玉
Wang Bei;Li Binchang;Dong Lifeng;Xu Guishan;Jia Mengke;Hou Changle;Diao Qiyu
出处
《饲料工业》
北大核心
2019年第9期45-51,共7页
Feed Industry
基金
国家重点研发计划[2016YFE0109000]
种养殖典型项目非二氧化碳温室气体减排量核算
监测
核查关键技术研究[2017YFF0211702]