Hostname: page-component-8448b6f56d-jr42d Total loading time: 0 Render date: 2024-04-23T19:43:58.141Z Has data issue: false hasContentIssue false
  • English
  • Français

Effects of diet quality on urea fates in sheep as assessed by refined, non-invasive [15N15N] urea kinetics

Published online by Cambridge University Press:  09 March 2007

G. E. Lobley ,
D. M. Bremner  and
G. Zuur
G. E. Lobley*
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB21 9SB, UK
D. M. Bremner
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB21 9SB, UK
G. Zuur
Affiliation:
Biomathematics and Statistics Scotland, Rowett Research Institute, Bucksburn, Aberdeen AB21 9SB, UK
*
*Correspondong author: Dr Gerald E. Lobley, fax +44 1224 7166 29, email gel@rri.sari.ac.uk
Rights & Permissions [Opens in a new window]

Abstract

An abstract is not available for this content so a preview has been provided. As you have access to this content, a full PDF is available via the ‘Save PDF’ action button.
Image of the first page of this content. For PDF version, please use the ‘Save PDF’ preceeding this image.'
Type
Research Article
Information
British Journal of Nutrition , Volume 84 , Issue 4 , October 2000 , pp. 459 - 468
Copyright
Copyright © The Nutrition Society 2000

References

Al-Dehneh, A, Huber, JT, Wanderley, R, Theurer, CB, Pessarakli, M and DeYoung, D (1997) Incorporation of recycled urea-N into ruminal bacteria flowing to the small intestine of dairy cows fed a high-grain or high-forage diet. Animal Feed Science Technology 68, 327–338.CrossRefGoogle Scholar
Bunting, LD, Boling, JA, MacKown CT and Muntifering, RB (1987) Effect of dietary protein level on nitrogen metabolism in lambs: studies using 15N-nitrogen. Journal of Animal Science 64, 855–867.CrossRefGoogle ScholarPubMed
Cooper, AJL, Nieves, E, Coleman, AE, Filc-De Ricco, S and Gelbard, AS (1987) Short term metabolic fate of [13N] ammonia in rat liver. in vivo. Journal of Biological Chemistry 262, 1073–1080.Google Scholar
Dixon, RM and Nolan, JV (1986) Nitrogen and carbon flows between the caecum, blood and rumen in sheep given chopped lucerne (Medicago sativa) hay. British Journal of Nutrition 55, 313–332.CrossRefGoogle ScholarPubMed
Egan, AR, Boda, K, Varady, J, (1986) Regulation of nitrogen metabolism and recycling.In Control of Digestion and Metabolism in Ruminants, 386–402. [Milligan, LP, Grovum, WL and Dobson, A]. Englewood Cliffs, NJ: Prentice-Hall.Google Scholar
El-Khoury, AE, Ajami, AM, Fukagawa, NK, Chapman, TE and Young, VR (1996) Diurnal pattern of the interrelationships among leucine oxidation, urea production and hydrolysis in humans. American Journal of Clinical Physiology 271, E563–E573.Google Scholar
Harmeyer, J and Martens, H (1980) Aspects of urea metabolism in ruminants with reference to the goat. Journal of Dairy Science 63, 1707–1728.CrossRefGoogle Scholar
Huntington, GB (1989) Hepatic urea synthesis and site and rate of urea removal from blood of beef steers fed alfalfa hay or a high concentrate diet. Canadian Journal of Animal Science 69, 215–223.Google Scholar
Huntington, GB, Zetina, EJ, Whitt, JM and Potts, W (1996) Effects of dietary concentrate level on nutrient absorption, liver metabolism, and urea kinetics of beef steers fed isonitrogenous and isoenergetic diets. Journal of Animal Science 74, 908–916.CrossRefGoogle ScholarPubMed
Jackson, AA (1995) Salvage of ureanitrogen and protein requirements. Proceedings of the Nutrition Society 54, 535–547.CrossRefGoogle ScholarPubMed
Jackson, AA, Picou, D and Landman, JP (1984) The non-invasive measurement of urea kinetics in normal man by a constant infusion of 15N15N-urea. Clinical Nutrition 38C, 339–354.Google Scholar
Jackson, AA, Danielsen, MS and Boyes, S (1993) A non-invasive method for measuring urea kinetics with a single dose of 15N15N-urea in free-living humans. Journal of Nutrition 123, 2129–2136.Google Scholar
Kennedy, PM and Milligan, LP (1980) The degradation and utilization of endogenous urea in the gastrointestinal tract of ruminants: a review. Canadian Journal of Animal Science 60, 205–221.CrossRefGoogle Scholar
Lobley, GE, Bremner, DM, Nieto, R, Obitsu, T, Hotston, Moore A and Brown, DS (1998) Transfers of N metabolites across the ovine liver in response to short-term infusions of an amino acid mixture into the mesenteric vein. British Journal of Nutrition 80, 371–379.CrossRefGoogle Scholar
Lobley, GE, Connell, A, Lomax, MA, Brown, DS, Milne, E, Calder, AG and Farningham, DAH (1995) Hepatic detoxification of ammonia in the ovine liver: possible consequences for amino acid catabolism. British Journal of Nutrition 73, 667–685.Google Scholar
Lobley, GE, Weijs, PJM, Connell, A, Calder, AG, Brown, DS and Milne, E (1996) The fate of absorbed and exogenous ammonia as influenced by forage or forage-concentrate diets in growing sheep. British Journal of Nutrition 76, 231–248.Google Scholar
Reynolds, CK and Huntington, GB (1988) Partition of portal-drained visceral net flux in beef steers. 1. Blood flow and net flux of oxygen, glucose and nitrogenous compounds across stomach and post-stomach tissues. British Journal of Nutrition 60, 539–551.Google Scholar
Reynolds, CK, Huntington, GB, Tyrrell, HF and Reynolds, PJ (1988) Net-portal-drained visceral and hepatic metabolism of glucose, L-lactate and nitrogenous compounds in lactating Holstein cows. Journal of Dairy Science 71, 1803–1812.CrossRefGoogle ScholarPubMed
Reynolds, CK, Tyrrell, HF and Reynolds, PJ (1991) Effects of diet forage-to-concentrate ratio and intake on energy metabolism in growing beef heifers: net nutrient metabolism by visceral tissues. Journal of Nutrition 121, 1004–1015.CrossRefGoogle ScholarPubMed
Sarraseca, A, Milne, E, Metcalf, MJ and Lobley, GE (1998) Urea recycling in sheep: effects of intake. British Journal of Nutrition 79, 79–88.CrossRefGoogle ScholarPubMed
Siddons, RC, Nolan, JV, Beever, DE and MacRae, JC (1985) Nitrogen digestion and metabolism in sheep consuming diets containing contrasting forms and levels of N. British Journal of Nutrition 54, 175–187.CrossRefGoogle ScholarPubMed
Torrallardona, D, Harris, CI, Coates, ME and Fuller, MF (1996) Microbial amino acid synthesis and utilization in rats. 1. Incorporation of 15N from 15NH4Cl into lysine in the tissues of germ-free and conventional rats. British Journal of Nutrition 76, 689–700.CrossRefGoogle Scholar
Várady, J, Tashenov, KT, Boda, K, Fejes, J and Kosta, K (1979) Endogenous urea secretion into the sheep gastrointestinal tract. Physiologia Bohemoslovaca 28, 551–559.Google Scholar
Whitt, J, Huntington, G, Zetina, E, Casse, E, Taniguchi, K and Potts, W (1996) Plasma flow and net nutrient flux across gut and liver of cattle fed twice daily. Journal of Animal Science 74, 2450–2461.CrossRefGoogle ScholarPubMed
Wolfe, RR (1981) Measurement of urea kinetics. in vivo by means of a constant tracer infusion of di-15N-urea. American Journal of Physiology 240, E428–E434.Google ScholarPubMed