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生长期牦牛能量代谢和瘤胃代谢的研究 被引量:6

STUDY ON METABOLISM OF ENERGY AND RUMEN IN GROWING YAKS
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摘要 用闭路式呼吸面具法和永久性瘤胃瘘管法及相应的代谢、饲养试验对1—3岁牦牛在海拔高度2300—4300m处作绝食能量代谢和瘤胃消化代谢测定,结果表明:牦牛在该高度范围内绝食产热值稳定不变;牦牛的等热区为8—14℃,并从—20℃起才随气温下降而增加产热;牦牛瘤胃发酵时,在挥发性脂肪酸中丙酸、丁酸比例较其他牛种高,并且当饲料质量下降时,高效酸仍保持较高比例;在较低海拔高度(2300m)时,牦牛的FHP=302.13kJ/kgW^(0.75),MEm为458kJ/kgW^(0.75),Km为0.66,这些数值与国内外对其他牛种研究结果接近,只是在高海拔条件下才显示差异。 The fasting energy metabolism and rumen digestible metabolism were determined with the method of closed-circuit respiratory mask and permanent rutnen fistula and correlated experiments of metabolism and feeding at the altitudes of 2300—4300 metres for 1 — 3 years yaks. The results indicated: the fasting heat production (FHP) of the yaks was stable at the altitudes of 2300—4300 metres; the zone of thermoneutrality was 8 — 14℃; and when ambient temperature was lower than -20℃, the heat production increased along with the temperature decreased; when feeds was fermented, the propionic acid and butyric acid portions to TVFA were higher in the yaks rumen than in the others; at yelative lower altitudes (2300 metres), FHP = 302. l3kJ/kgW^(0.75), ME_m = 458kJ/kgW^(0.75), K_m = 0. 66, these values were closed to the results of studied others cattle at home and abroad, but there was the difference betwen yak and other catlle at higher altitudes.
出处 《青海畜牧兽医杂志》 1992年第4期1-6,共6页 Chinese Qinghai Journal of Animal and Veterinary Sciences
关键词 能量代谢 瘤胃代谢 牦牛 Energy metabolism Rumen metabolism Growing Period yaks
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