[Use of urea as a marker of body water in Friesian cows].
Urea was used as a marker body water. Twelve catheterized dairy cows were injected with urea for 3 consecutive days. Equilibrium between injected and endogenous urea was obtained at 35.9 min over the 3 d. Different models to estimate urea space (EU) were compared with body water estimated at slaughter. The standard error was minimum when using the mean of EU on the 3 daily estimates obtained at 20 min. However, repeatability of EU measurement was low.
Agabriel
J
J
Station des Productions Bovines et Chevalines, INRA, Theix, Ceyrat, France.
Decourtenay
M B
MB
Ollier
A
A
D000818:Animals; D015415:Biomarkers; D001834:Body Water; D002417:Cattle / Q000097:blood*; D005260:Female; D014508:Urea / Q000097:blood*
D015415:Biomarkers; D014508:Urea
Utilisation de l'urée comme marqueur de l'eau corporelle chez des vaches Pie-noires.