摘要
Two experiments were conducted using direct method to determine the standardized ileal phosphorus (P) digestibility coefficient (SIPDC) of meat and bone meal (MBM) and poultry byproduct meal (PBM) for broilers. In the first experiment, three MBM from different batches were evaluated, with four treatments (MBMI, MBMII, MBMIII, and a P-free diet) and nine replicates of seven birds each, totaling 252 birds distributed across a completely randomized design. The P-free diet was used to determine endogenous P losses. Titanium dioxide (5 g kg−1) was used as an indigestible indicator. In the second experiment, three PBM from different batches were evaluated, with 189 birds distributed over three treatments (PBMI, PBMII, and PBMIII) and nine replicates of seven birds each. These two experiments were conducted when birds were 19-22 days old. The birds were euthanized to collect the ileal content. Using the P-free diet, endogenous P losses were determined at 94.9 mg kg−1 dry matter intake. Standardized ileal P digestibility of MBMI (0.65) and MBMIII (0.69) was higher compared with MBMII (0.49). The SIPDC determined for three PBM sources were similar and 0.96, 0.96, and 0.93 for PBMI, PBMII, and PBMIII, respectively. The present study demonstrates that P in MBM is not as available as it is believed and that the variability between batches should be considered by nutritionists, while PBM can be considered an excellent P source to broiler diets.
摘要译文
采用直接法进行了两次实验，确定了肉鸡肉骨粉（MBM）和家禽副产品粉（PBM）的标准回肠磷（P）消化率（SIPDC）。在第一个实验中，评估了三批不同批次的MBM，并采用了四种处理方法（MBMI，MBMII，MBMIII和无磷饮食）和九只重复的七只鸡，总共252只鸡分布在完全随机的设计中。无磷饮食用于确定内源性磷的损失。二氧化钛（5 g kg-1）被用作难消化的指示剂。在第二个实验中，评估了三批不同批次的PBM，将189羽鸟类分布在三种处理（PBMI，PBMII和PBMIII）中，每组七个鸟类进行了9次重复。这两个实验是在家禽19-22天大时进行的。对这些鸟实施安乐死以收集回肠内容。使用无磷饮食，确定的内源性P损失为94.9 mg kg-1干物质摄入量。 MBMI（0.65）和MBMIII（0.69）的标准回肠磷消化率高于MBMII（0.49）。确定的三个PBM来源的SIPDC相似，PBMI，PBMII和PBMIII的SIPDC分别为0.96、0.96和0.93。本研究表明，MBM中的磷不如人们所认为的那样有效，营养学家应考虑批次之间的差异，而PBM可以被视为肉鸡日粮中极好的磷源。
DILELIS; Felipe et al.. Standardized ileal phosphorus digestibility of meat and bone meal and poultry byproduct meal for broilers.[J]. Revista Brasileira de Zootecnia, 2021,50(50)