期刊
POULTRY SCIENCE
卷 91, 期 9, 页码 2201-2209出版社
POULTRY SCIENCE ASSOC INC
DOI: 10.3382/ps.2011-02063
关键词
phosphorus; retention; prececal digestibility; availability
资金
- H. Wilhelm Schaumann Foundation, Hamburg, Germany
The objectives of this study were to compare measurements of retention and prececal (pc) digestibility in evaluating mineral phosphorus (P) sources in 3- and 5-wk-old broilers. A corn-soybean meal-based basal diet was used (0.35% P on DM basis). Anhydrous monosodium phosphate (MSPa) or anhydrous dibasic calcium phosphate (DCPa) was supplemented to increment the P concentration by 0.08%, 0.16%, and 0.24%. Titanium dioxide was used as the indigestible marker. Two retention trials with excreta collection from d 16 to 20 and d 30 to 34 were conducted (n = 8 birds per diet). Another 8 pens of 10 birds from the same hatch were allocated to each diet on d 11 or 25 each to measure pc digestibility in both age periods. After 10 d of feeding, these birds were euthanized and the content of a defined section of the terminal ileum was obtained. Percentage P retention and pc digestibility for MSPa and DCPa were calculated by linear regression analysis. In 3-wk-old broilers, P retention for MSPa was 70% and significantly higher (P < 0.001) than for DCPa, (29%). Values determined for pc digestibility at the same age were very similar (67% for MSPa and 30% for DCPa; P < 0.001). In 5-wk-old broilers, P retention was 63% (MSPa) and 29% (DCPa; P < 0.001) and pc digestibility was 54% (MSPa) and 25% (DCPa; P = 0.002). We concluded that both retention and pc digestibility can be used for evaluating mineral P sources in broilers based on a regression approach. In 3-wk-old broilers, results obtained with both approaches were the same. In 5-wk-old broilers, the ranking of the 2 P sources was also the same for both approaches. Values did not differ significantly between the 2 age periods, but further studies on the relevance of broilers' age in P evaluation are suggested.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据