Cited by 260Ruminant Nutrition and Digestive PhysiologyAnimal Nutrition and PhysiologyAnimal Nutrition and Health

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The effect of feed intake and body weight on purine derivative excretion and microbial protein supply in sheep1

Chen, X. B., Chen, Y. K., Franklin, M. F., Ørskov, E. R., Shand, W. J.·1992·Journal of Animal Science

DOI 10.2527/1992.7051534x

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Abstract

Urinary excretion of purine derivatives (PD) was used to estimate the microbial N (MN) supply to sheep in three experiments designed to examine the effects of DMI and BW on the efficiency of microbial N supply (EMNS) to the host animal. In Exp. 1, four sheep of about 45 kg BW were given 328, 656, 984, and 1313 g of DM/d of a hay/concentrate diet in a Latin square design. Excretion of PD per kilogram of digestible organic matter intake (DOMI) increased with intake, and EMNS increased from 12.0 to 28.3 g of MN/kg of OM digested in the rumen (DOMR). In Exp. 2, 19 sheep ranging from 22 to 73 kg BW were all offered 820 g of DM/d of the same diet as that fed in Exp. 1. Although DM digestibility was relatively constant, PD excretion varied from 4.5 to 13.5 mmol/d and EMNS from 8 to 36 g of MN/kg of DOMR, both inversely related to animal BW. In Exp. 3, five sheep of 48 to 57 kg BW were given a different diet at 702, 966, or 1,237 g of DM/d. Purine derivative excretion per kilogram of DOMI increased with the DMI:BW ratio. Calculated EMNS ranged from 23 to 35 g of MN/kg of DOMR. Pooled data from all experiments showed EMNS to be related to the DMI:BW ratio. It is suggested that the DMI:BW ratio defines the ruminal digesta passage rate and hence outflow of microbial protein. The results imply that the EMNS for a given diet is not constant, but changes with intake.

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“…neutra (g/d) de las dietas evaluadas Rev Inv Vet Perú 2017; 28(1): 62-7068 siológico, edad, etc. La información disponible indica que la proporción de alantoína aumenta y el ácido úrico e hipoxantina más xantina disminuyen cuando se incrementa el consumo de materia seca (Chen et al., 1992).”
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ผลของการเสรมกากชาตอสมรรถภาพการผลต การยอยไดปรากฏ และ การผลตกาซมเทนของแพะนมลกผสม
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“Daily supply of microbial N to the small intestine was estimated following the model described by Chen et al. [13], namely: Microbial N supply (g/d) = 70X/(0.83 × 0.116 × 1000) = 0.727X, where 70 is the N content of purines (mg/mmol), 0.83 is the digestibility of microbial purines and 0.116 is the…”
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The urinary excretion of purine derivatives in sheep is not inﬂuenced by long term treatment with vasopressin
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“Chen et al. (1992a) suggest that the changes in endogenous allantoin excretion may reflect remodeling of the metabolic state of the animal during periods when protein supply fluctuates.”
Background

Authors: Chen, X. B., Chen, Y. K., Franklin, M. F., Ørskov, E. R., & Shand, W. J.
Affiliations: University of Aberdeen (GB)
Venue: Journal of Animal Science
Publisher: Oxford University Press (OUP)
Published: 1992-05-01
Volume: 70
Issue: 5
Pages: 1534-1542
ISSN: 0021-8812 (ISSN-L)
1525-3163
DOI: 10.2527/1992.7051534x
OpenAlex: W274450734
Cited by: 260
References: 5
Citations by year: 2026: 7 · 2025: 9 · 2024: 10 · 2023: 7 · 2022: 11 · 2021: 11 · 2020: 7 · 2019: 7 · 2018: 6 · 2017: 14 · 2016: 8 · 2015: 2 · 2014: 8 · 2013: 9 · 2012: 13
FWCI: 16.81
Type: journal article
Language: en
Open access: closed
Locations: Journal of Animal Science (publishedVersion)
PubMed (publishedVersion)
Topics: Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Ruminant Nutrition and Digestive Physiology
Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Nutrition and Physiology
Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Nutrition and Health
Keywords: purine derivatives, microbial protein supply, sheep, dry matter intake, body weight, urinary excretion, rumen nitrogen
MeSH terms: Allantoin, Animals, Bacterial Proteins, Body Weight, Digestion, Eating, Female, Hypoxanthines, Male, Purines, Rumen, Sheep, Uric Acid, Xanthines, Hypoxanthine, Xanthine

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The effect of feed intake and body weight on purine derivative excretion and microbial protein supply in sheep1

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