不同中性洗涤纤维与非纤维性碳水化合物比值饲粮对肉用绵羊甲烷排放的影响

发布时间：2019-03-29 12:51

【摘要】：本试验旨在研究不同中性洗涤纤维(NDF)与非纤维性碳水化合物(NFC)比值(NDF/NFC)饲粮对肉用绵羊甲烷排放的影响。试验采用4×4完全拉丁方试验设计,将16只杜泊×小尾寒羊杂交羯羊随机分成4组,每组4只,按维持水平饲喂NDF/NFC分别为3.02(饲粮1)、2.32(饲粮2)、1.58(饲粮3)、1.04(饲粮4)的全混合颗粒饲粮(玉米秸秆为粗饲料来源)。试验共进行4期,每期18 d,包括3 d的调整期、7 d的预试期和8 d的正试期,在正试期内测定甲烷产量、饲粮总能和营养物质表观消化率。结果表明:饲粮2的甲烷日排放量显著高于饲粮3和4(43.43 L/d vs.38.88和35.98 L/d;P0.05)。与饲粮1相比,饲粮2和3的每千克干物质采食量(DMI)甲烷排放量显著增加(38.00 L/kg DMI vs.42.24、41.69 L/kg DMI;P0.05),但是饲粮2、3和4之间差异不显著(P0.05)。随着NDF/NFC的降低,每千克可消化有机物(DOM)的甲烷排放量逐渐降低,饲粮4的每千克DOM的甲烷排放量显著低于饲粮1、2和3(58.78 L/kg DOM vs.75.00、73.35和64.11 L/kg DOM;P0.05)。随着NDF/NFC的降低,每千克中性洗涤纤维采食量(NDFI)或酸性洗涤纤维采食量(ADFI)的甲烷排放量逐渐增加,且各饲粮之间差异显著(P0.05)。综上所述,结合各营养物质表观消化率和甲烷排放效率,在维持水平下,采用NDF/NFC为1.04的玉米秸秆饲粮作为肉用绵羊甲烷减排的饲粮最合适。
[Abstract]:The purpose of this experiment was to study the effect of different neutral detergent fiber (NDF) to non-fibrous carbohydrate (NFC) ratio (NDF/NFC) diet on methane emission in meat sheep. Sixteen Dupo 脳 small tail Han sheep were randomly divided into 4 groups, each group was fed with NDF/NFC of 3.02 (diet 1) and 2.32 (diet 2), respectively, according to the maintenance level of 4 脳 4 complete Latin square design, and 16 Dupo 脳 small tail Han sheep were randomly divided into 4 groups, each group was divided into 4 groups, 4 in each group, and 4 in each group. 1.58 (diet 3), 1.04 (diet 4) full mixed grain diet (corn straw is the source of roughage). Four periods of 18 days each, including 3 days adjustment period, 7 d pre-test period and 8 d positive test period, were conducted to determine methane yield, dietary total energy and apparent digestibility of nutrients during the positive test period. The results showed that the daily methane emission of diet 2 was significantly higher than that of diet 3 and 4 (43.43 L / vs.38.88 and 35.98 L / d / d P 0.05). There was a significant increase in (DMI) methane emissions per kilogram of dry matter intake in diets 2 and 3 compared to dietary 1 (38.00 L/kg DMI vs.42.24,41.69 L/kg DMI;). But there was no significant difference between 2, 3 and 4 diets (P0.05). As NDF/NFC decreases, methane emissions per kilogram of digestible organic matter (DOM) gradually decrease. Methane emissions per kilogram of DOM in diet 4 were significantly lower than those in diets 1, 2 and 3 (58.78 L/kg DOM vs.75.00,73.35 and 64.11 L/kg DOM;) (P0.05). With the decrease of NDF/NFC, methane emissions per kilogram of neutral detergent fiber intake (NDFI) or acid detergent fiber intake (ADFI) increased gradually, and there was significant difference among different diets (P0.05). In conclusion, combined with the apparent digestibility of nutrients and methane emission efficiency, under the maintenance level, the corn straw diet with NDF/NFC of 1.04 is the most suitable diet for reducing methane emission of meat sheep.
【作者单位】：甘肃农业大学动物科学技术学院;中国农业科学院饲料研究所农业部饲料生物技术重点实验室;金陵科技学院动物科学与技术学院;北京农学院动物科技学院;
【基金】：国家自然科学基金“绵羊甲烷排放的粪便反射特征光谱研究”(41475126) 国家科技支撑计划项目子课题“农区肉羊健康养殖模式构建与示范”(2012BAD39B05-3)
【分类号】：S826.5

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