用食道瘘管测定放牧绵羊日采食牧草干物质量

采用食道瘘管技术与两级离体消化试验及外源指示剂Cr_2O_3测定日排粪量技术3结合的方法,在新疆南山夏秋两季牧场分别进行放牧中国美利奴细毛绵羊牧草干物质采食量的测定。测得夏牧场上18只放牧母羊采食牧草干物质量平均为96.02±7.408克/体重公斤~(0.75)和日排粪干物质量平均为38.72±4.20克/体重公斤~(0.75)。秋牧场上8只放牧母羊采食牧草干物质量平均为75.41±5.799克/体重公斤~(0.75)和日排粪干物质量为38.31±2.73克/体重公斤(0.75)。测得用3只食道瘘管羊采集夏秋牧场上牧草标样的干物质消化率分别为59.65±2.376％与49.02±5.538％,秋季采食牧草干物质量及消化率均显著大于秋季(p<0.001)。两季牧场的日排粪干物质量没有显著性差异(p>0.05)。

ESTIMATION ON FORAGE TNTAKE OF GRAZING SHEEP BY A COMBINED METHOD OF ESOPHAGEAL FISTULATION,IN VITRO DIGESTION AND Cr_2O_3, RATIO TECHNIQUE

DM intake of Chinese Merino on summer and autumn pastures was measured in Xinjiang Southern-mountain Sheep Breeding Farm by means of esophageal fistulation, in vitro digestion and Cr2O3 ratio technique. The average forage intake of 18 ewes on summer pasture and of 8 ewes on autumn pasture were 96 02 ± 7.408 and 75.41± 5.799g DM/kgw0.75, respectively with the former being significantly higher than the latter (P<0.001). Estimates of IVDMD in diets by 3 esophageal-fistulated sheep were 59.65±2.376% oh summer pasture and 49.02 ±5.538% on autumn pasture. The difference is highly significant (P<0.001). However, the fecal output of dry matter per kg of metabolic body weight of the ewes grazing on the two kinds of pastures were similar (38.72 vs. 38.31g DM/kgw).