Water Turnover in Cattle

Abstract

The half-life of the body water pool in cattle is unusually short, relative to their body size. The short half-life is not due to milk formation, since the same result is observed in nonlactating cattle as in cattle producing 23 kg (50 lb) of milk per day.

Avian Water Metabolism—A Review

“…These values suggest that factors other than egg production per se influence the rate of water turnover in hens. Similar observations with the dairy cow suggest that milk production per se is not responsible for the increased body water pool found in the lactating vs non-lactating cow (Black, et al, 1964). Chapman and Mihai (1972) showed the laying bird to have a greater body water flux (pool size x turnover rate) than the non-laying bird-(419 as opposed to 195 ml/d).…”

Apports de la surveillance du centre CEA-Valduc sur la connaissance des transferts de l’eau tritiée atmosphérique dans les différents compartiments de l’environnement

“…Une meilleure compréhension des proportions entre tritium organique et tritium non échangeable conduirait probablement à réduire les évaluations des doses, en contrebalançant d'autres approximations soulignées par ailleurs (Black et al, 1964). Le point délicat est bien évidemment le temps et le coût de la préparation des échantillons, qui ne sont pas adaptés aux besoins réels de la surveillance d'un Centre nucléaire, compte tenu de la faiblesse des expositions.…”

A dynamic model for assessing radiological consequences of tritium routinely released in rivers. Application to the Loire River

“…For cow or beef, biological elimination rate for HTO in meat or milk is in the range 0.12e0.23 day À1 (half-life in the range 3e6 days) (Black et al, 1964;van den Hoek et al, 1979van den Hoek et al, , 1983; van den Hoek, 1986).…”