Urine composition of some hystricomorph rodents confined to metabolism cages

Cold acclimation in the tundra vole

“…The graph of the K + -excretion has the same pattern as that of the Na + -excretion (PI a t n e r, 1960), although caution must be exercised in the interpretation of electrolyte excretion whenever »intake« and »balance« data are not accurately available (Baker, 1960). Similar to the findings of Bellamy & Weir (1972) in six species of hystricomorphs and the findings of Berberich (1975) in the brown lemming, and unlike results found in the laboratory rat (Bellamy, Lamming & Stevenson, 1970), the concentration of potassium in the vole was higher than that of sodium. The increase of the K + -level in the urine is also running parallel with the raise of the pH.…”

Cold acclimation in the tundra vole

“…The graph of the K + -excretion has the same pattern as that of the Na + -excretion (PI a t n e r, 1960), although caution must be exercised in the interpretation of electrolyte excretion whenever »intake« and »balance« data are not accurately available (Baker, 1960). Similar to the findings of Bellamy & Weir (1972) in six species of hystricomorphs and the findings of Berberich (1975) in the brown lemming, and unlike results found in the laboratory rat (Bellamy, Lamming & Stevenson, 1970), the concentration of potassium in the vole was higher than that of sodium. The increase of the K + -level in the urine is also running parallel with the raise of the pH.…”

Organic matter and macromineral digestibility in domestic rabbits (Oryctolagus cuniculus) as compared to other hindgut fermenters

“…a, Table ), which has been interpreted as an adaptation to reduce urinary water losses (Hagen et al., ). Nevertheless, an increase of urinary Ca concentration with putatively increasing dietary Ca intake, in spite of an increase in urinary volume (as the diet richer in Ca also contained more water), has also been observed in chinchillas (Kohl, ), and urinary Ca levels were not evidently different between chinchillas and several other rodents, including guinea pigs (Bellamy and Weir, ). A particular challenge in determining Ca digestibility in many small rodents might be that Ca concentrations measured in faeces could be influenced by urine often deposited on these faeces.…”

Cold acclimation in the tundra vole

“…The graph of the K + -excretion has the same pattern as that of the Na + -excretion (PI a t n e r, 1960), although caution must be exercised in the interpretation of electrolyte excretion whenever »intake« and »balance« data are not accurately available (Baker, 1960). Similar to the findings of Bellamy & Weir (1972) in six species of hystricomorphs and the findings of Berberich (1975) in the brown lemming, and unlike results found in the laboratory rat (Bellamy, Lamming & Stevenson, 1970), the concentration of potassium in the vole was higher than that of sodium. The increase of the K + -level in the urine is also running parallel with the raise of the pH.…”

Organic matter and macromineral digestibility in domestic rabbits (Oryctolagus cuniculus) as compared to other hindgut fermenters

“…a, Table ), which has been interpreted as an adaptation to reduce urinary water losses (Hagen et al., ). Nevertheless, an increase of urinary Ca concentration with putatively increasing dietary Ca intake, in spite of an increase in urinary volume (as the diet richer in Ca also contained more water), has also been observed in chinchillas (Kohl, ), and urinary Ca levels were not evidently different between chinchillas and several other rodents, including guinea pigs (Bellamy and Weir, ). A particular challenge in determining Ca digestibility in many small rodents might be that Ca concentrations measured in faeces could be influenced by urine often deposited on these faeces.…”

Cold acclimation in the tundra vole

“…The graph of the K + -excretion has the same pattern as that of the Na + -excretion (PI a t n e r, 1960), although caution must be exercised in the interpretation of electrolyte excretion whenever »intake« and »balance« data are not accurately available (Baker, 1960). Similar to the findings of Bellamy & Weir (1972) in six species of hystricomorphs and the findings of Berberich (1975) in the brown lemming, and unlike results found in the laboratory rat (Bellamy, Lamming & Stevenson, 1970), the concentration of potassium in the vole was higher than that of sodium. The increase of the K + -level in the urine is also running parallel with the raise of the pH.…”

Organic matter and macromineral digestibility in domestic rabbits (Oryctolagus cuniculus) as compared to other hindgut fermenters

“…a, Table ), which has been interpreted as an adaptation to reduce urinary water losses (Hagen et al., ). Nevertheless, an increase of urinary Ca concentration with putatively increasing dietary Ca intake, in spite of an increase in urinary volume (as the diet richer in Ca also contained more water), has also been observed in chinchillas (Kohl, ), and urinary Ca levels were not evidently different between chinchillas and several other rodents, including guinea pigs (Bellamy and Weir, ). A particular challenge in determining Ca digestibility in many small rodents might be that Ca concentrations measured in faeces could be influenced by urine often deposited on these faeces.…”