Abstract

Abstract Body water cantent and water turnover were measured in lactating and dry cows grazing clover-dominant pastures. Among 12 pairs of identical twins there was a closer within-twin relationship of body weight and body water content than water turnover. Water turnover was significantly correlated with body water content and milk production. Herd average for the half-life of water was 2.0–2.4 days for lactating cows and 2.8–3.3 days for dry cows. No relationship was found between water turnover and the susceptibility of cows to bloat. During severe bloat, cows dosed with anti-bloat had higher water turnovers and lower bloat scores than their untreated twins.

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