Meta-analysis on the biological efficiency of two different methionine-sources in broiler chickens
- Publikations-Art
- Kongressbeitrag
- Autoren
- Sauer N., Piepho H.-P., Emrich K., Lemme A., Mosenthin R.
- Erscheinungsjahr
- 2007
- Veröffentlicht in
- Berichte der Gesellschaft für Ernährungsphysiologie
- Herausgeber
- Holger Martens (Hrsg.)
- Verlag
- DLG-Verlags GmbH , Frankfurt
- Serie/Bezeichnung
- Proc. Soc. Nutr. Physiol.,
- Seite (von - bis)
- 121
- Tagungsname
- 61. Tagung
- Tagungsort
- Göttingen
- Tagungsdatum
- 06.-08.03.2007
- Schlagworte
- amino acid, broiler chickens, Broilerfütterung, Meta-analysis, Methionine sources
Methionine is a limiting amino acid in commercial broiler diets and commonly supplemented as DL-Methionine (DLM) or as Methionine-Hydroxy-Analogue-Free-Acid (MHA-FA). In broiler chickens, numerous studies on the efficiency of MHA-FA in comparison to DLM with respect to different performance parameters have been carried out, however, there is still controversial discussion about the biological efficiency of these two methionine sources. Thus, based on a comprehensive literature survey, a meta-analysis has been conducted to estimate the relative efficiency of MHA-FA compared to DLM on average daily gain (ADG) in broiler chickens.Results: The dose-response of both methionine sources on ADG could be described with a non-linear regression, also referred to as "Mitscherlichs" function. Moreover, the analyses of the individual studies confirmed that for both methionine sources the dose-response for ADG reaches a common plateau. In agreement with the analyses of the single data, the meta-analysis did not provide the required convergence criterion, when different plateaus for ADG for both methionine sources were analysed. The meta-analysis revealed significant (p<0.0001) differences between DLM and MHA-FA. The inclusion of the three co-variables in the model revealed that only the addition of the co-variable "start of the experiment (SOE)" had a significant (p=0.0004) effect on the model. The result of the meta-analysis showed in broilers an efficiency of 78% for MHA-FA on molar basis in comparison to DLM based on ADG. The following non-linear regression equation was obtained: Conclusion: It can be concluded that a non-linear model may be used to analyse differences in biological efficiency between MHA-FA and DLM using ADG as response measure.