| Autor: |
Greene, L. Wayne, Harms, Paul G., Schelling, Gerald T., Byers, Floyd M., Ellis, William C., Kirk, David J. |
| Zdroj: |
The Journal of Nutrition; June 1985, Vol. 115 Issue: 6 p753-758, 6p |
| Abstrakt: |
Female Sprague-Dawley rats were fed two levels of phosphorus ad libitum and in a paired feeding arrangement to yield the following three treatments: 1) adequate phosphorus (0.40%) ad libitum intake, 2) low phosphorus (0.04%) ad libitum intake and 3) adequate phosphorus pair-fed with the low phosphorus group. Feed intake, growth rate and feed conversion in rats fed 0.04% phosphorus ad libitum and in pair-fed control rats were lower (P< 0.01) than in rats fed 0.40% phosphorus ad libitum. Seventy-five percent of the rats exhibited normal estrous cycles, as indicated by vaginal smears, throughout the 105-d period regardless of dietary phosphorus level. Breeding efficiency and number of pups per litter were not altered by dietary treatment. However, compared to either phosphorus-adequate group, dams fed 0.04% phosphorus weaned fewer (P< 0.05) pups and pup survival to 45 d of age was lower (P< 0.05). Average daily gain postweaning was 67% lower for pups in the phosphorus-deficient group than for those in either phosphorus-adequate group. Phosphorus deficiency in rats does not alter estrous cycles but reduces pup survivability postnatally. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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