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首页> 外文期刊>Poultry Science >Methodology affects measures of phosphorus availability in growing broilers: Effects of calcium feeding strategy and dietary adaptation period length on true ileal phosphorus digestibility and predicted endogenous phosphorus losses
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Methodology affects measures of phosphorus availability in growing broilers: Effects of calcium feeding strategy and dietary adaptation period length on true ileal phosphorus digestibility and predicted endogenous phosphorus losses

机译：方法论影响生长肉鸡中磷可用性的措施：钙喂养策略和膳食适应期长度对真正的髂磷消化率和预测内源性磷损失的影响

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An experiment was conducted to determine the effects of Ca feeding strategy and dietary adaptation period length (DAPL) on the apparent ileal P digestibility (AIPD) and apparent ileal myo-inositol 1,2,3,4,5,6 hexakis dihydrogen phosphate (IP6) hydrolysis (AIIP6H) of corn titration diets. Nine hundred sixty Ross x Ross 708 male broiler chicks were placed into 80 battery cages. Broilers received a common starter diet until 18 d of age and then were fed one of 10 experimental treatments from 19 to 21 d of age. Nine diets were formulated to evaluate 5 corn inclusion concentrations (15, 30, 45, 60, or 75%) and 2 Ca feeding strategies (fixed at 0.35% or 1.4:1 Ca: P) after 3 DAPL (zero, 24, and 48 h). As a control for DAPL, one treatment group received the common starter diet for the duration of the experiment. Broilers consuming the control diet had higher (P < 0.001) BW gain and feed intake than broilers fed the corn titration diets. Apparent ileal P digestibility of the control diet was affected (P = 0.038) by DAPL. For diets formulated with a 1.4:1 Ca: P ratio, negative linear effects (P < 0.05) on AIPD and AIIP6H were observed with increasing corn. Conversely, for diets formulated with 0.35% Ca, positive linear effects (P < 0.05) were measured for AIPD after a 48 DAPL while no linear or quadratic effects (P > 0.05) were measured for AIPD or AIIP6H for other DAPL. Broilers fed diets formulated with 1.4: 1 Ca: P had variable (P < 0.05) true ileal P digestibility (TIPD; 32.2, 15.1, and 35.4%) and negative endogenous P losses (EPL; -190, -499, and -262 mg/kg DM intake) for zero, 24, and 48 h DAPL, respectively. Conversely, TIPD values (41.2, 39.1, and 47.3%) were similar (P > 0.05) and EPL were positive (102, 197, and 154 mg/kg DM intake), regardless of DAPL, for broilers fed diets formulated with 0.35% Ca. These data demonstrated that formulating diets with a 1.4: 1 Ca: P ratio affected AIPD of the titration diets, shifting the regression line and predicted negative EPL and an underestimation of TIPD.
机译：进行了实验以确定CA饲养策略和膳食适应周长（DAPL）对表观ILAL P消化率（AIPD）和表观髂骨肌醇1,2,3,4,5,6六磷酸二氢磷酸盐（ IP6）玉米滴定饮食的水解（AIIP6H）。九百六十罗斯X罗斯708雄性肉鸡小鸡被置于80个电池笼中。肉鸡接受了常见的起始饮食直至18 d年龄，然后从19至21天喂10例实验治疗中的一个。配制九种饮食以在3DAPL（零，24和48小时）。作为DAPL的对照，一个治疗组在实验期间接受了常见的起始饮食。消耗控制饮食的肉鸡具有更高（P <0.001）BW增益和进料摄入而不是喂食玉米滴定饮食。通过DAPL，对照饮食的表观ILAL P P消化率受到影响（p = 0.038）。对于用1.4：1 CA：P比配制的饮食，随着玉米的增加，观察到AIPD和AIIP6H上的负线性效应（P <0.05）。相反，对于用0.35％Ca配制的饮食，在48Dapl之后测量阳性线性效应（P <0.05），同时没有测量用于其他DAPL的αIIPD或AIIP6H的线性或二次效果（P> 0.05）。肉鸡喂养饮食，配制的饮食为1.4：1 ca：p有变量（p <0.05）真正的ilial p消化率（tipd; 32.2,15.1和35.4％）和负内源性p损耗（epl; -190，-499和-262 Mg / kg DM摄入量分别为零，24和48小时DAPL。相反，Tipd值（41.2,39.1和47.3％）类似（P> 0.05），无论DAPL，EPL为阳性（102,197和154mg / kg DM摄入量），用于饲喂0.35％的饮食加利福尼亚州。这些数据表明，用1.4：1的饮食提供饮食：P比受滴定饮食的αIIPD，移位回归和预测的负EPL和拖曳的低估。

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