Digestibility, nutrient balance and urinary purine derivative excretion in dry yak cows fed oat hay at different levels of intake

	Digestibility, nutrient balance and urinary purine derivative excretion in dry yak cows fed oat hay at different levels of intake
	Long, RJ ; Dong, SK ; Hu, ZZ ; Shi, JJ ; Dong, QM ; Han, XT
刊名	LIVESTOCK PRODUCTION SCIENCE ; Long RJ, Dong SK, Hu ZZ, Shi JJ, Dong QM, Han XT.Digestibility, nutrient balance and urinary purine derivative excretion in dry yak cows fed oat hay at different levels of intake.LIVESTOCK PRODUCTION SCIENCE,2004,88(1-2): 27-32
	2004-06-01
英文摘要	A feeding trial A as conducted at the farm of Qinghai Academy of Animal and Veterinary Science, Xining, China during 1996 - 1997 with three dry yak cows (initial body weight 163 - 197 kg, age 5 - 6 years) by using 3 x 3 Latin Square Design to determine the effect of levels of feed intake on digestion, nitrogen balance and purine derivative excretion in urine of yak cows. The animals were fed oat hay (nitrogen 13.5 g/kg dry matter (DM), metabolisable energy 8.3 MJ/kg DM), i.e., 0.3, 0.6 and 0.9 of voluntary intake (VI). Each intake treatment lasted for 17 days and the samples (feeds, faeces and urine) were collected during last 7 days of each period. The results indicate that digestibility of dietary DM, OM, NDF and ash declined when intake levels increased from 0.3 to 0.9 VI [DM, from 66.1% to 59.1% (P < 0.05); OM, from 68.1% to 59.9% (P < 0.05); NDF, from 62.1% to 54.3% (P < 0.05); and ash, from 33.9% to 11.8% (P < 0.05)]. Around 0.10 g N/kg W-0.75 was deficient daily in yak cows at 0.3 VI, and positive N balances were observed at 0.6 and 0.9 VI. Intake levels significantly (P < 0.05) affected total PD excretion in yak urine. The proportion of allantoin increased (P < 0.05) and uric acid decreased (P < 0.05) as intake level of feed increased. (C) 2004 Elsevier B.V. All rights reserved.; A feeding trial A as conducted at the farm of Qinghai Academy of Animal and Veterinary Science, Xining, China during 1996 - 1997 with three dry yak cows (initial body weight 163 - 197 kg, age 5 - 6 years) by using 3 x 3 Latin Square Design to determine the effect of levels of feed intake on digestion, nitrogen balance and purine derivative excretion in urine of yak cows. The animals were fed oat hay (nitrogen 13.5 g/kg dry matter (DM), metabolisable energy 8.3 MJ/kg DM), i.e., 0.3, 0.6 and 0.9 of voluntary intake (VI). Each intake treatment lasted for 17 days and the samples (feeds, faeces and urine) were collected during last 7 days of each period. The results indicate that digestibility of dietary DM, OM, NDF and ash declined when intake levels increased from 0.3 to 0.9 VI [DM, from 66.1% to 59.1% (P < 0.05); OM, from 68.1% to 59.9% (P < 0.05); NDF, from 62.1% to 54.3% (P < 0.05); and ash, from 33.9% to 11.8% (P < 0.05)]. Around 0.10 g N/kg W-0.75 was deficient daily in yak cows at 0.3 VI, and positive N balances were observed at 0.6 and 0.9 VI. Intake levels significantly (P < 0.05) affected total PD excretion in yak urine. The proportion of allantoin increased (P < 0.05) and uric acid decreased (P < 0.05) as intake level of feed increased. (C) 2004 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.nwipb.ac.cn/handle/363003/1395]
专题	西北高原生物研究所_中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Long, RJ,Dong, SK,Hu, ZZ,et al. Digestibility, nutrient balance and urinary purine derivative excretion in dry yak cows fed oat hay at different levels of intake[J]. LIVESTOCK PRODUCTION SCIENCE, Long RJ, Dong SK, Hu ZZ, Shi JJ, Dong QM, Han XT.Digestibility, nutrient balance and urinary purine derivative excretion in dry yak cows fed oat hay at different levels of intake.LIVESTOCK PRODUCTION SCIENCE,2004,88(1-2): 27-32,2004.
APA	Long, RJ,Dong, SK,Hu, ZZ,Shi, JJ,Dong, QM,&Han, XT.(2004).Digestibility, nutrient balance and urinary purine derivative excretion in dry yak cows fed oat hay at different levels of intake.LIVESTOCK PRODUCTION SCIENCE.
MLA	Long, RJ,et al."Digestibility, nutrient balance and urinary purine derivative excretion in dry yak cows fed oat hay at different levels of intake".LIVESTOCK PRODUCTION SCIENCE (2004).