| Autor: |
Lynch, G. P., Fries, G. F., Hiner, R. L. |
| Zdroj: |
Journal of Animal Science; March 1968, Vol. 27 Issue: 2 p370-376, 7p |
| Abstrakt: |
The purpose of this experiment was to study the effects of feeding various ratios of hay:grain on the sodium and potassium balances and the potassium space estimates in sheep. Four wethers were assigned to a 4×4 latin square balance experiment during which four ratios of hay:grain were fed. During each balance period the animals received a single dose of 42K for determination of potassium space. Samples of urine, feces and rumen content were obtained during each balance period for determination of specific activity, sodium and potassium contents. At the end of the final balance period, the animals were slaughtered, fat-free tissue of the whole body and of the carcass was determined. Balance data indicated that the experimental animals remained in a negative sodium balance as long as hay constituted a part of the ration. A fecal loss of sodium occurred even in a negative sodium balance. A positive potassium balance was shown for all animals even on the all-grain ration. The administered isotope appeared to attain equilibrium among various excreta and rumen samples just prior to the 48-hr, period. More than 10% of the total dose of 42K was lost in the feces with the all-hay ration, but as the ratios of hay:grain decreased, the total percent of the 42K loss in the feces attains a lower more constant value. The consequences of a large outflow of fecal potassium in relation to 42K dilution experiments are discussed. The relationship between potassium space estimates and fat-free tissue of the whole body and of the carcass are shown. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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