| Autor: |
Sutton, A. L., Mayrose, V. B., Nye, J. C., Nelson, D. W. |
| Zdroj: |
Journal of Animal Science; December 1976, Vol. 43 Issue: 6 p1129-1134, 6p |
| Abstrakt: |
A 2-year experiment was conducted to study the effects of .2 or .5% salt (NaCl) in growing-finishing swine diets and aerobic (oxidation ditch) or anaerobic (deep pit) liquid waste systems on swine performance and waste nutrient composition.Neither dietary salt content nor waste handling system affected pig gains or feed conversion. Waste from pigs fed .5% salt contained higher sodium levels than waste from pigs fed .2% salt. During the study, the sodium level increased in the waste pits beneath pigs fed the .5% salt diet, whereas the sodium level in the waste pits beneath pigs fed the .2% salt diet remained relatively constant.Aerobically treated waste contained lower dry matter and higher dissolved oxygen concentrations, had higher pH and temperature on a wet basis, and lower ammonium nitrogen and higher nitrate nitrogen, potassium and sodium concentrations on a dry weight basis that anaerobic waste. The average percentage of ammonium nitrogen to total Kjeldahl nitrogen was 42% in aerobic pits, 53% in anaerobic pits, 45.5% in waste from pigs fed .5% salt diets and 49.5% in waste from pigs fed .2% salt diets.Copper and phosphorus levels in wastes were directly related to the dry matter content of the waste. Sodium and potassium concentrations (dry weight basis) were higher in aerobically treated waste from pigs fed the .5% salt diet compared to anaerobically treated waste from pigs fed the .2% salt diet. |
| Databáze: |
Supplemental Index |
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