Varying apparent metabolizable energy concentrations and protease supplementation affected broiler performance and jejunal and ileal nutrient digestibility from 1 to 35 d of age.

Autor:	McCafferty KW; USDA-ARS Poultry Research Unit, MS, 39762, United States. Electronic address: Klint.McCafferty@usda.gov., Morgan NK; School of Environmental and Rural Sciences, University of New England, Armidale, NSW, 2351, Australia., Cowieson AJ; DSM Nutritional Products, Kaiseraugst, 4303, Switzerland., Choct M; School of Environmental and Rural Sciences, University of New England, Armidale, NSW, 2351, Australia., Moss AF; School of Environmental and Rural Sciences, University of New England, Armidale, NSW, 2351, Australia.
Jazyk:	angličtina
Zdroj:	Poultry science [Poult Sci] 2022 Jul; Vol. 101 (7), pp. 101911. Date of Electronic Publication: 2022 Apr 08.
DOI:	10.1016/j.psj.2022.101911
Abstrakt:	An experiment was conducted to evaluate the effects of varying AME concentrations and protease supplementation on broiler performance and jejunal and ileal nutrient digestibility from 1 to 35 d of age. Ross × Ross 308 male broilers (n = 1,008) were equally distributed into 48 floor pens and offered 1 of 6 dietary treatments (8 replicate pens/treatment). Dietary treatments consisted of a factorial arrangement with AME concentration (low-, moderate-, or high-AME) and supplemental protease (without or with) as the main factors. Birds and feed were weighed on 1, 15, 29, and 35 d of age to determine body BW, BW gain (BWG), feed intake (FI) and feed conversion ratio (FCR). At 15 and 29 d of age, jejunal and ileal digesta contents were collected to determine nutrient digestibility. From 1 to 15 d of age, broilers offered moderate-AME diets (P < 0.05) had 6.7, 7.1, 4.8% higher BW, BWG, FI, respectively, and a 2.1% lower FCR compared with those offered low-AME diets. Likewise, protease increased (P < 0.05) BW and BWG by 4.3 and 4.7%, respectively, and decreased (P < 0.05) FCR by 3.4%, compared with those offered the diets without protease. From 1 to 29 d of age, broilers offered high-AME diets had 2.9% lower (P < 0.05) FCR compared with those offered low-AME diets. Protease increased (P < 0.05) BW, BWG, and FI by 3.1, 3.2, and 4.2%, respectively, compared with the unsupplemented diets. From 1 to 35 d of age, broilers receiving high-AME diets had 2.9% lower (P < 0.05) FCR compared with those offered low-AME diets. Protease increased (P < 0.05) FCR by 1.0% compared with those offered unsupplemented diets. Jejunal (15 and 29 d of age) and ileal (29 d of age) starch digestibility and jejunal nitrogen digestibility (29 d of age) were lower (P < 0.05) in broilers offered high-AME diets compared with those offered low-AME diets. Both AME concentration and supplemental protease independently affected broiler performance, with responses being most apparent during early growth phases whereas digestibility measures were mainly influenced by AME concentration. Competing Interests: Disclosures None. (Published by Elsevier Inc.)
Databáze:	MEDLINE
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