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Bacillus amyloliquefaciens cEcT 5940 improves performance and gut function in broilers fed different levels of protein and/or under necrotic enteritis challenge

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Animal Nutrition 2021年第1期7卷 185-197页

作者： Kosar Gharib-Naseri juliano c.p.dorigam Kiran Doranalli Natalie Morgan Robert A.Swick Mingan choct Shu-Biao Wu School of Environmental and Rural Science University of New EnglandArmidaleNSW 2351Australia Evonik Nutrition&care GmbH Rodenbacher Chaussee 463457 Hanau-WolfgangGermany University of New England Armidale 2351Australia

Two studies were conducted to investigate the effect of Bacillus amyloliquefaciens cEcr 5940(BA)as a probiotic on growth performance,amino acid digestibility and bacteria population in broiler chickens under a subclinical necrotic enteritis(NE)challenge and/or fed diets with different levels of crude protein(cp).Both studies consisted of a 2×2 factorial arrangement of treatments with 480 Ross 308 mix-sexed broiler *** study 1,treatments included 1)NE challenge(+/),and 2)BA(1.0×106 cFU/g of feed)supplementation(+/-).In study 2,all birds were under NE challenge,and treatments were 1)cp level(Standard/Reduced[2%less than standard])and 2)BA(1.0×106 cFU/g of feed)supplementation(+/-).After inducing NE infection,blood samples were taken on d 16 for uric acid evaluation,and cecal samples were collected for bacterial *** both studies,ileal digesta was collected on d 35 for nutrient digestibility *** study 1,the NE challenge reduced body weight gain(BWG),supressed feed conversion ratio(FcR)and serum uric acid levels(ppplementation of BA increased BWG(pced FcR(p=0.043)across dietary treatments,regardless of ***(p=0.030)and Ruminococcus(p=0.029)genomic DNA copy numbers and concentration of butyrate(p=0.017)were higher in birds fed the diets supplemented with *** study 2,reduced protein(Rcp)diets decreased BWG(p=0.010)and uric acid levels in serum(ppplementation of BA improved BWG(p=0.001)and FcR(p=0.005)and increased Ruminococcus numbers(p=0.018)and butyrate concentration(p=0.033)in the ceca,regardless of dietary cp ***,addition of BA reduced clostridium perfringens numbers only in birds fed with Rcp diets(p=0.039).At d 35,BA sup-plemented diets showed higher apparent ileal digestibility of cystine(p=0.013),valine(p=0.020),and lysine(p=0.014).In conclusion,this study suggests positive effects of BA supplementation in broiler diets via modulating gut microflora and improving nutrient upta

关键词： Bacillus amyloliquefaciens Necrotic enteritis Growth performance Reduced protein diet Bacteria population Gut function

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

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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 Science The University of Sydney poultry Research Foundation The University of Sydney Evonik Operations GmbH

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 production(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, respectively. The EAAp based on AMINOHen and breeder recommendation had lower digestible AA than QBL, and higher EAAp than LBL models for both production phases. At 20 weeks of age, 224 ISA Brown layer hens were weighed and randomly allocated to individual battery cages. Each of the four diets was replicated 8 times with 7 birds per replicate. Egg production was recorded daily, and egg weights were measured at the end of each week. Feed consumption was measured at the end of each period. The 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; p cant effect on feed intake and body weight(p > 0.05). The highest feed conversion ratio(FcR) during pp(p = 0.067) and post pp(p corded for the birds offered diets based on LBL recommendation. In conclusion, all four EAAp tested in this study support an above average egg production rate. However, 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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