Rumen liquid dilution rate in dairy cows fed once daily: effects of diet and sodium bicarbonate supplementation

Three ruminally cannulated Holstein cows fed total mixed diets of hay crop silage and concentrate (30:70, 50:50, 70:30, 100:0) were used to determine liquid volume ruminal and dilution rate with polyethylene glycol as a marker. Dosing 5 h prefeeding produced nonlinear marker dilution curves that wer...

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Bibliographic Details
Published in:Journal of dairy science 1985-05, Vol.68 (5), p.1171-1180
Main Authors: Stokes, M.R, Bull, L.S, Halteman, W.A
Format: Article
Language:English
Subjects:
ALIMENT CONCENTRE
ALIMENTOS CONCENTRADOS
Animals
BICARBONATE
BICARBONATES
Bicarbonates - pharmacology
BICARBONATOS
BOVIN LAITIER
Cattle - physiology
COMPLEMENT ALIMENTAIRE
CONCENTRATES
COWS
DAIRY CATTLE
Diet
FEED INTAKE
FEED SUPPLEMENTS
Feeding Behavior - physiology
Female
GANADO DE LECHE
INGESTION DE PIENSO
METABOLISM
METABOLISME
METABOLISMO
PRISE ALIMENTAIRE (ANIMAUX)
RUMEN
Rumen - drug effects
Rumen - physiology
SODIO
SODIUM
Sodium - pharmacology
Sodium Bicarbonate
SUPLEMENTOS ALIMENTARIOS
VACA
VACHE
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Summary:Three ruminally cannulated Holstein cows fed total mixed diets of hay crop silage and concentrate (30:70, 50:50, 70:30, 100:0) were used to determine liquid volume ruminal and dilution rate with polyethylene glycol as a marker. Dosing 5 h prefeeding produced nonlinear marker dilution curves that were divided into prefeeding, eating, and resting phases, whereas dosing 2 h postfeeding produced linear dilution curves. Ruminal liquid volume calculated from either dosing method overestimated liquid volume compared to manual estimates. Mean liquid dilution rates did not differ between methods of dosing, and differences between diets were closely related to dry matter intake. Supplementation with 0, 68, or 114 g/day sodium bicarbonate did not affect ruminal liquid volume or dilution rates. Across diet and buffer treatments, liquid dilution rate during eating (23 to 32%/h) was greater than mean, prefeeding, or resting dilution rates (10 to 21%/h). Correct interpretation of ruminal volume and dilution data requires full details of dosing method, dosing time in relation to feeding, and sampling times.
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.S0022-0302(85)80944-9