Rumen phosphorus metabolism in sheep

An extended model of phosphorus metabolism in growing ruminants.

A major objective of this study was to extend the Vitti-Dias model used to describe P metabolism in ruminants, by adding 2 new pools to the original model to represent the rumen and saliva. An experiment was carried out using 24 male sheep, initial BW of 34.5 kg, aged 8 mo, fed a basal diet supplied with increasing amounts of dicalcium phosphate to provide 0.14, 0.32, 0.49, and 0.65% P in the d...

The effect of ruminal phosphate concentration on the absorption of calcium, phosphorus and magnesium from the reticulo-rumen of the sheep.

1. The absorption rates of calcium, inorganic phosphate (Pi) and magnesium were determined from buffered solutions placed in the temporarily isolated and washed reticulo-rumen of conscious sheep. The basic composition of these solutions was similar to that found in supernatant fractions of ultracentrifuged rumen contents. 2. The Pi concentrations studied in these solutions were 2, 8.7, 14, 17.3...

Urease (EC 3.5.1.5) inhibition in the sheep rumen and its effect on urea and nitrogen metabolism.

The urease (EC 3.5.1.5) inhibitor, phenylphosphoryldiamidate (PPDA), was given by continuous infusion into the rumen of two sheep nourished by intragastric infusion and into either the rumen or abomasum of four sheep given a pelleted diet containing 119 g crude protein (nitrogen x 6.25)/kg dry matter. PPDA was given at 1 g/d in infusion sheep and 1.5 g/d in the normally-fed sheep. Measurements ...

The metabolism of nitrate and nitrite in the sheep; the reduction of nitrate in the rumen of the sheep.

[Relationship between propionate metabolism and TCA cycle in rumen epithelium of normal starved and alloxan diabetic sheep].

It was reported that there was a relationship between the propionate metabolism and TCA cycle, and that starvation and alloxan treatment influenced the propionate metabolism, and the relationships between the propionate metabolism and glucolysis were changed by the alloxan treatment in the rumen epithelium of sheep. Further study was designed to elucidiate the relationship betweenthe propionate...