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应用~(13)N标记稻草饲喂3只山羊,以探明羊对稻草N、C化合物的消化、吸收、排泄和转化规律。结果表明,已宰杀的2只羊消化、吸收、转化为羊机体的~(15)N占试验日粮中~(15)N富集总量的38.54和23.78％,平均为31.16％。3只羊从粪尿中排泄的~(15)N各占饲料中~(15)N的34.78、33.88和33.18％,平均为33.95±0.80％,已屠宰的2只羊对饲料~(15)N总回收率为73.32和56.96％,损失率为26.68和43.04％。饲料~(15)N的回收利用率与饲料中氨基酸的消化率(％)相吻合。1、2、3号羊对饲料碳水化合物的消化率分别为76.40、68.66和65.19％。其中饲喂2、3号羊的饲料中都含稻草50％左右,羊对碳水化合物的平均消化率为66.93％。
Three goats were fed with ~ (13) N-labeled rice straw to investigate the digestion, absorption, excretion and transformation of sheep straw on N, C compounds. The results showed that ~ (15) N, which was digested, absorbed and transformed into sheep, accounted for 38.54 and 23.78% of the total amount of ~ (15) N enrichment in the experimental diets, with an average of 31.16%. The three sheep excreted from excrement (15) N each accounted for 34.78, 33.88 and 33.18% of the ~ (15) N in the feed with an average of 33.95 ± 0.80% Total N recovery rates were 73.32 and 56.96%, with losses of 26.68 and 43.04%. Feed ~ (15) N recycling rate and amino acid digestibility (%) match. The digestibility of feed carbohydrates for No. 1, No. 2 and No. 3 sheep was 76.40, 68.66 and 65.19%, respectively. The feed of No. 2 and No. 3 sheep contained about 50% of the straw, and the average carbohydrate digestibility of the sheep was 66.93%.