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Assessment of four different dietary amino acid profiles recommended for ISA Brown layer hens:A validation study

Animal Nutrition 2024年第2期17卷 438-446页

作者： Mehdi Toghyani Shemil Macelline Juliano C.de Paula Dorigam Peter V.Chrystal Peter H.Selle Sonia Y.Liu School of Life and Environmental Sciences Faculty of ScienceThe University of SydneyCamperdown 2006NSWAustralia Poultry Research Foundation The University of SydneyCamden 2570NSWAustralia Evonik Operations GmbH Hanau-Wolfgang 63457Germany

The current feeding study was designed to validate the two dietary essential amino acid profiles(EAAP)established based on linear broken-line(LBL)and quadratic broken-line(QBL)models,in a previous study,against Evonik(aminoHen)and breeder recommendations for ISA Brown layers for peak pro-duction(PP,20 to 44 weeks of age),and post peak production(post PP,44 to 75 weeks of age).The EAAP based on LBL models on average had 19.5%and 26.0%lower digestible AA(Lys,Met+Cys,Thr,Trp,Ile and Val),than the EAAP based on QBL models for PP and post PP,*** EAAP based on aminoHen and breeder recommendation had lower digestible AA than QBL,and higher EAAP than LBL models for both production *** 20 weeks of age,224 ISA Brown layer hens were weighed and randomly allocated to individual battery *** of the four diets was replicated 8 times with 7 birds per *** production was recorded daily,and egg weights were measured at the end of each *** consumption was measured at the end of each *** egg production rate was not significantly affected by the diets and remained at around 98.0%(PP)and 95.0%(post PP)(P>0.05).Birds fed diets based on LBL recommendation consistently laid smaller eggs,resulting in a lower egg mass(59.8 vs.62.0 g egg/hen per day during PP,and 60.3 vs.63.0 g egg/hen per day during post PP;P0.05).The highest feed conversion ratio(FCR)during PP(P=0.067)and post PP(P<0.05)was recorded for the birds offered diets based on LBL *** conclusion,all four EAAP tested in this study support an above average egg production ***,the EAAP based on LBL models may potentially decrease the input feed cost per kilogram of eggs but are not set to optimise FCR and maximise egg mass.

关键词： ideal amino acid profile Regression model Egg production Egg mass

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