家畜生态学报2018，Vol.39Issue(1)：31-36,6.
不同NDF与NFC比例饲粮对肉用绵羊瘤胃发酵参数及甲烷排放动态变化的影响
Effect of Different NDF and NFC Dietary on Dynamic Changes of Rumen Fermentation Parameters and Methane Emissions in Sheep
摘要
Abstract
This study investigated the effects of corn-stalk-based diets with different ratios of neutral detergent fiber (NDF) to non-fiber carbohydrates (NFC) on the rumen fermentation and methane emission of mutton sheep.The trial was conducted by a 4 × 4 Latin square design:12 Dorper × thin tailed Han crossbred wethers with permanent rumen fistulas were randomly divided into 4 groups with 3 sheep each,and each group was randomly fed one of four total mixed rations with a ratio of NDF/NFC as 3.60,2.70,1.75 or 1.05 (Diet 1,2,3,and 4,respectively).All animals were fed at maintenance level.The trial included 4 periods,and each period lasted for 23 d with a 10-d adaptation period.The methane emission was measured by respiration chambers with Sable system,rumen fluid pH,ammonia nitrogen (NH3-N) and volatile fatty acid (VFA) were measured at different time points.The results showed that 0,6,and 8 h after feeding the rumen pH value of Diet 4 was lower than that of Diet 1 (P＜0.05).Ruminal NHa-N was different between groups (P＜0.05);4 h after feeding,the proportion of ruminal acetic acid in the total volatile fatty acid (TVFA) for Diet 1 was higher than that of the other three diets (P＜0.05);0 and 2 h after feeding,accounted for the proportion of butyric acid in the total volatile acid for Diet 4 was higher than that of the other three diets (P＜0.05).Four hours after feeding,the ratio of acetate to propionic acid for Diet 4 was lower than that of the other three diets (P＜0.05).During the periods of 0～2,2～4 h,and 6～8 h after feeding,methane emissions from the animals on Diet 4 were lower than those on the other diets (P＜0.05).Therefore,it is concluded that by maintaining the feeding level,the animals fed the diet with a NDF/NFC ratio of 1.05 had a low ruminal pH and low proportion of acetate in TVFA,and less methane emissions.Methane emissions also changed dynamically with the changes of rumen fermentation,with methane emissions reaching the peak during the period of 0 to 2 h after feeding in mutton sheep.关键词
NDF/NFC/瘤胃发酵/甲烷/肉羊Key words
neutral detergent fiber/non-fiber carbohydrates/rumen fermentation/methane emission/mutton sheep分类
农业科技引用本文复制引用
丁静美,邓凯东,张蓉,马涛,刁其玉,成述儒,周丽雪,屠焰..不同NDF与NFC比例饲粮对肉用绵羊瘤胃发酵参数及甲烷排放动态变化的影响[J].家畜生态学报,2018,39(1):31-36,6.基金项目
国家自然科学基金(41475126) （41475126）
中国农业科学院科技创新工程(1610382017002) （1610382017002）
国家肉羊产业技术体系(CARS-39) （CARS-39）
