{"title":"Prediction of ileal digestible phosphorus in broiler chicken diets supplemented with exogenous phytase","authors":"Jung Sung, O. Adeola","doi":"10.1139/cjas-2023-0103","DOIUrl":null,"url":null,"abstract":"The objectives were to develop equations for predicting ileal digestible phosphorus (P) based on non-phytate P, phytate P, calcium to non-phytate P ratio, and exogenous phytase concentrations in broiler diets, and to evaluate the accuracy of the models. The Modified Michaelis–Menten model was used to predict apparent (AID) or standardized ileal digestible (SID) P in broiler diets. Two different methods were used to analyze 25 published ileal digestible P data to evaluate the accuracy of the equation for predicting AID P. The first method assessed mean and linear biases. While the mean bias was significant (P < 0.05), the linear bias was not significant. The second method involved regressing the 25 AID P data against those predicted by the current model. The results showed that the intercept and slope of the regression were not statistically different from 0 and 1, respectively. This suggests that the current equation accurately represents the test data. In conclusion, the accuracy of the model depends on validation processes. Considering that the current model was developed using various phytase products, it would be preferable to use an equation that is based on a single phytase product if requisite quantity of data is available.","PeriodicalId":9512,"journal":{"name":"Canadian Journal of Animal Science","volume":null,"pages":null},"PeriodicalIF":1.2000,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Canadian Journal of Animal Science","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1139/cjas-2023-0103","RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"AGRICULTURE, DAIRY & ANIMAL SCIENCE","Score":null,"Total":0}
引用次数: 0
Abstract
The objectives were to develop equations for predicting ileal digestible phosphorus (P) based on non-phytate P, phytate P, calcium to non-phytate P ratio, and exogenous phytase concentrations in broiler diets, and to evaluate the accuracy of the models. The Modified Michaelis–Menten model was used to predict apparent (AID) or standardized ileal digestible (SID) P in broiler diets. Two different methods were used to analyze 25 published ileal digestible P data to evaluate the accuracy of the equation for predicting AID P. The first method assessed mean and linear biases. While the mean bias was significant (P < 0.05), the linear bias was not significant. The second method involved regressing the 25 AID P data against those predicted by the current model. The results showed that the intercept and slope of the regression were not statistically different from 0 and 1, respectively. This suggests that the current equation accurately represents the test data. In conclusion, the accuracy of the model depends on validation processes. Considering that the current model was developed using various phytase products, it would be preferable to use an equation that is based on a single phytase product if requisite quantity of data is available.
目的是根据肉鸡日粮中的非植酸磷、植酸磷、钙与非植酸磷比率和外源植酸酶浓度,建立预测回肠可消化磷(P)的方程,并评估模型的准确性。改良迈克尔-门顿模型用于预测肉鸡日粮中的表观可消化磷(AID)或标准化回肠可消化磷(SID)。使用两种不同的方法分析了 25 个已发表的回肠可消化 P 数据,以评估该方程预测表观可消化 P 的准确性。虽然平均偏差显著(P < 0.05),但线性偏差并不显著。第二种方法是将 25 个 AID P 数据与当前模型预测的数据进行回归。结果显示,回归的截距和斜率分别与 0 和 1 没有统计学差异。这表明当前方程准确地代表了测试数据。总之,模型的准确性取决于验证过程。考虑到目前的模型是使用多种植酸酶产品开发的,如果有必要的数据量,最好使用基于单一植酸酶产品的方程。
期刊介绍:
Published since 1957, this quarterly journal contains new research on all aspects of animal agriculture and animal products, including breeding and genetics; cellular and molecular biology; growth and development; meat science; modelling animal systems; physiology and endocrinology; ruminant nutrition; non-ruminant nutrition; and welfare, behaviour, and management. It also publishes reviews, letters to the editor, abstracts of technical papers presented at the annual meeting of the Canadian Society of Animal Science, and occasionally conference proceedings.