Starving for nutrients: anorexia during infection with parasites in broilers is affected by diet composition

ABSTRACT: In 2 experiments, we investigated whether diet composition plays a role in pathogen-induced anorexia, the voluntary reduction in ADFI during infection in broilers. We hypothesized that either energy or CP dietary content could influence the extent of anorexia in Ross 308 broilers and infec...

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Autores principales:	James Taylor, Panagiotis Sakkas, Ilias Kyriazakis
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2022
Materias:	anorexia broilers crude protein intake energy intake eimeria Animal culture SF1-1100
Acceso en línea:	https://doaj.org/article/6fa1e60f002e4255acb59c02717681bb
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spelling	oai:doaj.org-article:6fa1e60f002e4255acb59c02717681bb2021-11-18T04:43:14ZStarving for nutrients: anorexia during infection with parasites in broilers is affected by diet composition0032-579110.1016/j.psj.2021.101535https://doaj.org/article/6fa1e60f002e4255acb59c02717681bb2022-01-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0032579121005575https://doaj.org/toc/0032-5791ABSTRACT: In 2 experiments, we investigated whether diet composition plays a role in pathogen-induced anorexia, the voluntary reduction in ADFI during infection in broilers. We hypothesized that either energy or CP dietary content could influence the extent of anorexia in Ross 308 broilers and infection outcomes with Eimeria maxima. From d 13 of age, half of the birds were infected, and half were uninfected. ADFI was measured daily, and BW every 3 d until d 29. Oocyst excretion was measured daily from d 17 to 23. The impact of parasitism on the small intestine was assessed on d 19 and 25. In Experiment 1, 336 birds were offered diets progressively diluted with lignocellulose, starting from a diet with 3,105 (kcal ME/kg) and 20% CP. There was a significant interaction between infection and diet on ADFI during the acute stage of infection (d 17 to 21): for control birds diet dilution decreased ADFI and consequently reduced energy and CP intake. For infected birds, diet dilution increased ADFI, leading to the same energy and CP intake across diets. Oocyst excretion and villi length to crypt depth ratio (VCR) were constant across infected treatments. In Experiment 2, 432 birds were offered diets with constant ME (3,105 kcal/kg), but different CP contents (24, 20, 26, and 12%). Infection significantly reduced ADFI. Although there was no interaction between infection and diet on ADFI, there was an interaction on CP intake during the acute stage of infection. Infected birds on the 20% CP diet achieved the same CP intake as uninfected birds. There were no differences in the VCR and ADG of the infected birds on 24, 20 and 16% CP treatments, but birds on 12% had the lowest ADG and excreted more oocysts. We suggest that during infection, birds target a nutrient resource intake, which appears to be beneficial for infection outcomes, while at the same time they avoid excess protein intake. We conclude that different mechanisms regulate ADFI in infected and uninfected birds.James TaylorPanagiotis SakkasIlias KyriazakisElsevierarticleanorexiabroilerscrude protein intakeenergy intakeeimeriaAnimal cultureSF1-1100ENPoultry Science, Vol 101, Iss 1, Pp 101535- (2022)
institution	DOAJ
collection	DOAJ
language	EN
topic	anorexia broilers crude protein intake energy intake eimeria Animal culture SF1-1100
spellingShingle	anorexia broilers crude protein intake energy intake eimeria Animal culture SF1-1100 James Taylor Panagiotis Sakkas Ilias Kyriazakis Starving for nutrients: anorexia during infection with parasites in broilers is affected by diet composition
description	ABSTRACT: In 2 experiments, we investigated whether diet composition plays a role in pathogen-induced anorexia, the voluntary reduction in ADFI during infection in broilers. We hypothesized that either energy or CP dietary content could influence the extent of anorexia in Ross 308 broilers and infection outcomes with Eimeria maxima. From d 13 of age, half of the birds were infected, and half were uninfected. ADFI was measured daily, and BW every 3 d until d 29. Oocyst excretion was measured daily from d 17 to 23. The impact of parasitism on the small intestine was assessed on d 19 and 25. In Experiment 1, 336 birds were offered diets progressively diluted with lignocellulose, starting from a diet with 3,105 (kcal ME/kg) and 20% CP. There was a significant interaction between infection and diet on ADFI during the acute stage of infection (d 17 to 21): for control birds diet dilution decreased ADFI and consequently reduced energy and CP intake. For infected birds, diet dilution increased ADFI, leading to the same energy and CP intake across diets. Oocyst excretion and villi length to crypt depth ratio (VCR) were constant across infected treatments. In Experiment 2, 432 birds were offered diets with constant ME (3,105 kcal/kg), but different CP contents (24, 20, 26, and 12%). Infection significantly reduced ADFI. Although there was no interaction between infection and diet on ADFI, there was an interaction on CP intake during the acute stage of infection. Infected birds on the 20% CP diet achieved the same CP intake as uninfected birds. There were no differences in the VCR and ADG of the infected birds on 24, 20 and 16% CP treatments, but birds on 12% had the lowest ADG and excreted more oocysts. We suggest that during infection, birds target a nutrient resource intake, which appears to be beneficial for infection outcomes, while at the same time they avoid excess protein intake. We conclude that different mechanisms regulate ADFI in infected and uninfected birds.
format	article
author	James Taylor Panagiotis Sakkas Ilias Kyriazakis
author_facet	James Taylor Panagiotis Sakkas Ilias Kyriazakis
author_sort	James Taylor
title	Starving for nutrients: anorexia during infection with parasites in broilers is affected by diet composition
title_short	Starving for nutrients: anorexia during infection with parasites in broilers is affected by diet composition
title_full	Starving for nutrients: anorexia during infection with parasites in broilers is affected by diet composition
title_fullStr	Starving for nutrients: anorexia during infection with parasites in broilers is affected by diet composition
title_full_unstemmed	Starving for nutrients: anorexia during infection with parasites in broilers is affected by diet composition
title_sort	starving for nutrients: anorexia during infection with parasites in broilers is affected by diet composition
publisher	Elsevier
publishDate	2022
url	https://doaj.org/article/6fa1e60f002e4255acb59c02717681bb
work_keys_str_mv	AT jamestaylor starvingfornutrientsanorexiaduringinfectionwithparasitesinbroilersisaffectedbydietcomposition AT panagiotissakkas starvingfornutrientsanorexiaduringinfectionwithparasitesinbroilersisaffectedbydietcomposition AT iliaskyriazakis starvingfornutrientsanorexiaduringinfectionwithparasitesinbroilersisaffectedbydietcomposition
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Starving for nutrients: anorexia during infection with parasites in broilers is affected by diet composition

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