期刊
POULTRY SCIENCE
卷 82, 期 7, 页码 1140-1148出版社
POULTRY SCIENCE ASSOC INC
DOI: 10.1093/ps/82.7.1140
关键词
calcium; 25-hydroxycholecalciferol; intestine; phytase; phytate
Broilers chickens have limited ability to utilize phytate phosphorus (PP), and the influence of nutrients on the activity and efficacy of intestinal phytase is unclear. Therefore in a 2 x 2 x 2 factorial experiment, male chicks were fed 0 or 0.21 mg/kg 25-hydroxycholecalciferol (25-OH D-3) or 9 g/kg Ca supplied from CaCO3 or Ca malate from 14 to 24 d of age (six pens/treatment, eight birds/pen). Source of Ca had no effect on tibia ash, intestinal phytase activity, or apparent ileal PP hydrolysis. Phytase activity (V-max) within brush border vesicles prepared from small intestinal mucosa was greater in chicks fed 4 vs. 9 g/kg Ca (P less than or equal to 0.05). Similarly, birds fed 4 vs. 9 g/kg Ca were able to hydrolyze an additional 24.36% PP (P < 0.01). Intestinal phytase activity and apparent ileal PP hydrolysis were not affected by 25-OH D-3 supplementation, but tibia ash was improved by 2.7% (P < 0.01). A subsequent experiment validated the effect of dietary Ca (4 and 9 g/kg) and elucidated differences between strains (Ross 308 and Hubbard x Peterson) from 8 to 22 d of age (six pens/treatment, eight birds/pen). The strains responded similarly to dietary Ca in terms of intestinal phytase and apparent ileal PP hydrolysis. Intestinal phytase activity was 9% greater in birds fed 4 vs. 9 g/kg Ca (P < 0.05) and apparent ileal PP hydrolysis was 11.9% greater (P < 0.02). In conclusion, a typical dietary Ca concentration (9 g/kg) reduced intestinal phytase activity and apparent ileal PP hydrolysis.
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