Water turnover rate and total body water affected by different physiological factors under Egyptian environmental conditions.
1982
Kamal T.H.
The tritiated water dilution technique was used to determine the total body water (TBW) and water turnover rate (WTR), which is assumed to be similar to water intake, in water buffalo, Red Danish cattle, fat-tailed Osemi sheep and crossed Nubian-Bedouin goats and camels (Camelus dromedarius). There was a significant (P < 0.05) effect of species on TBW and WTR. The combined data of buffalo, cattle and sheep revealed a significant (P < 0.05) effect of pregnancy on TBW, but not on WTR. The combined data of buffalo and cattle showed a significantly lower TBW (P < 0.01) and a higher WTR (P < 0.05) in lactating animals than in heifers. In buffalo WTR was on average 81% higher in summer grazing (SG) than in spring. It was also 118 and 20% higher in summer non-grazing (SNG), than in either spring or SG, respectively. The differences between treatments in heifers, pregnant and lactating, were significant (P<0.01), except between spring and SG in heifers. The TBW was on average 12% higher in SG than in spring. It was also 18 and 5% higher in SNG than in either spring or SG, respectively. The differences between treatments in heifers, pregnant and lactating, were significant, except between SG and SNG in heifers and lactating cows and between spring and SG in lactating cows. (author).
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