Selected ruminal variables and purine urinary excretion rate of steers subjected to feeding, fasting, and re-feeding conditions

The effects of feeding, fasting, and re-feeding on the ruminal profile of growing cattle were studied. Ruminal fluid and urine samples were obtained from 12 crossbred steers weighing approximately 300 kg during the following periods: 11 h of normal feeding (postprandial period), 48 consecutive hours...

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Veröffentlicht in:Polish journal of veterinary sciences 2022-01, Vol.25 (1), p.175-182
Hauptverfasser: Ortolani, E L, Maruta, C A, Barrêto Júnior, R A, Mori, C S, Antonelli, A C, Sucupira, M C A, Minervino, A H H
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container_end_page 182
container_issue 1
container_start_page 175
container_title Polish journal of veterinary sciences
container_volume 25
creator Ortolani, E L
Maruta, C A
Barrêto Júnior, R A
Mori, C S
Antonelli, A C
Sucupira, M C A
Minervino, A H H
description The effects of feeding, fasting, and re-feeding on the ruminal profile of growing cattle were studied. Ruminal fluid and urine samples were obtained from 12 crossbred steers weighing approximately 300 kg during the following periods: 11 h of normal feeding (postprandial period), 48 consecutive hours of fasting, and followed by 48 h of re-feeding. Fasting promotes changes in the ruminal profile, such as an increase in ruminal pH, reduction in the number of rumen protozoa and bacteria, and decrease in the urinary excretion of allantoin; however, it does not change the urinary uric acid excretion rate. The overall mean ruminal pH was higher during fasting (7.53±0.27) in comparison to those at normal feeding (6.72±0.25) and re-feeding (6.62±0.31) (p⟨0.05). During re-feeding, the ruminal profile returned to normal, except for the protozoa count, which despite a slight increase only after 48 h of re-feeding, did not recover to baseline values.
doi_str_mv 10.24425/pjvs.2022.140854
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subjects Allantoin
Animal Feed - analysis
Animals
Anorexia
Appetite
Bacteria
Cattle
Creatinine
Diet - veterinary
Dietary fiber
Digestion
Excretion
Fasting
Feeding
Fermentation
Food
Hydrogen-Ion Concentration
Metabolism
Metabolites
Microbiota
Microorganisms
pH effects
Purines - metabolism
Rumen - metabolism
Uric acid
Urine
Variables
Veterinary medicine
title Selected ruminal variables and purine urinary excretion rate of steers subjected to feeding, fasting, and re-feeding conditions
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