大麦/箭筈豌豆混合日粮对绵羊营养物质消化率和温室气体排放的影响

为研究不同比例箭筈豌豆(Vicia sativa)日粮对绵羊消化代谢和温室气体排放的影响,本试验选用12只体况良好、体重为(30±1)kg的6月龄杂交代公羊,随机分为2组,分别饲喂不同箭筈豌豆添加水平的日粮。两组饲粮中,大麦(Hordeum vulgare)∶箭筈豌豆比例分别为8∶2和6∶4。预饲期为15 d,正式饲喂实验为6 d,试验羊转入代谢笼内采用全收粪尿法进行消化代谢试验。结果表明,2组间干物质采食量及营养物质消化率差异均不显著(P<0.05);6∶4组的单位代谢体重的氧气日消耗量有高于8∶2组的趋势(P=0.083),2组间甲烷、二氧化碳排放量各指标差异不显著(P<0.05)。综上可知,箭筈豌豆添加比例为20%和40%的日粮饲喂绵羊在营养物质消化代谢和温室气体排放的效果基本相同。

Effects of different barely/common vetch diets on nutrient digestibility and greenhouse gas emission of sheep

Here we evaluate the effects of different proportions of common vetch(Vicia sativa)diets on the digestibility and metabolism as well as greenhouse gas emission of sheep.Twelve 6-month-old hybrid rams weighing 30±1 kg were chosen and randomly assigned into two groups.The animals from the two groups were fed with different diets supplemented with different proportions of common vetch.Dietary barely∶common vetch was in the ratio of 8∶2 or 6∶4.The pre-test period lasted for 15 days,and the trial period lasted for 9 days,after which the sheep were transferred to metabolic cages for digestion and metabolism trial using total urine and fecal collection method.The result revealed no significant differences in dry matter intake and nutrient digestibility between the two groups(P<0.05).The daily O2 consumption per kilogram body weight BW0.75 in the 6∶4 group tended to be higher than that in the 8∶2 group(P=0.083).No significant difference in CH4 and CO2 daily emission was observed between the two groups(P<0.05).Thus,the feeding effect of 20%common vetch and 40%common vetch on nutrients digestion and greenhouse gas emission of sheep was similar.