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Multiple Comparison Tests

Multiple Comparison Tests

Multiple comparison test, abbreviated as MCT, is a post hoc analysis generally performed after comparing multiple samples with one or more tests. An MCT will help identify a significantly different sample among multiple samples or a factor among multiple factors.
It would be easy to compare two samples using a significance alpha level of 0.05. In other words, there is only one sample pair to be compared. However, it would be difficult to identify a significantly different sample if the number...

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Production of Germ-Free Fast-Growing Broilers from a Commercial Line for Microbiota Studies

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Meta-Analyses of Methionine Source Concept Validation Trials in Broilers.

Andreas Lemme¹, Zeyang Li¹, Juliano Dorigam¹

¹Evonik Operations GmbH, 63457 Hanau, Germany.

Animals : an Open Access Journal From MDPI

|June 27, 2024

Summary

Methionine hydroxy analogue (MHA) can replace DL-methionine in broiler feed at a 100:65 ratio. This meta-analysis confirms MHA

Keywords:

body weight gain broiler feed conversion ratio meta-analysis methionine sources

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Area of Science:

Animal Science
Poultry Nutrition
Feed Additives

Background:

Methionine (Met) supplementation is crucial in broiler feeds.
Debate exists regarding the nutritional equivalence of methionine hydroxy analogue (MHA) versus DL-methionine.
Current recommendations suggest MHA is 65% as effective as DL-methionine.

Purpose of the Study:

To conduct a meta-analysis evaluating the efficacy of MHA relative to DL-methionine in broiler nutrition.
To challenge the existing 65% efficacy recommendation for MHA.
To identify factors influencing MHA's nutritional value.

Main Methods:

A literature search identified 25 publications with 95 data sets.
Hedges' g effect sizes were computed for meta-analysis.
Data were subgrouped by broiler strain, diet type, data origin, and MHA product.

Main Results:

The meta-analysis revealed very low heterogeneity and small effect sizes.
DL-methionine results were not significantly different from MHA.
No significant impact was observed across various subgroups or dietary methionine+cysteine levels.

Conclusions:

MHA products are nutritionally equivalent to DL-methionine on a weight-to-weight basis of 100:65.
This ratio is applicable across diverse production conditions without compromising broiler performance.
The findings support a direct weight-to-weight replacement of MHA with DL-methionine at the 65% level.