2021 journal article

Effects of graded levels of exogenous xylanase in corn-soy diets with two amino acid density and fat levels postpellet in broiler chickens: live performance, energy utilization, digestibility, and carcass characteristics

POULTRY SCIENCE, 100(2), 820–834.

By: C. Rabello n, M. Costa n, W. Nogueira n, J. Guilherme Barbosa, J. Carlos Rios-Alva n, C. Wyatt, T. York, M. Serrano n, E. Orlando Oviedo-Rondon

co-author countries: Brazil 🇧🇷 Spain 🇪🇸 United States of America 🇺🇸
author keywords: carcass; digestibility; nutrient density; performance; xylanase
MeSH headings : Amino Acids / administration & dosage; Animal Feed / analysis; Animal Nutritional Physiological Phenomena; Animals; Chickens / growth & development; Chickens / metabolism; Diet / veterinary; Dietary Fats / administration & dosage; Dietary Supplements; Digestion; Endo-1,4-beta Xylanases / administration & dosage; Male; Soybeans / enzymology; Zea mays / enzymology
Source: Web Of Science
Added: March 1, 2021

This experiment evaluated the interactive effects among xylanase (XL; 0, 8,000, 16,000, and 32,000 BXU/kg), amino acid density (AA; high and low 10% difference), and additional fat (AF; 0 or +1.17%) applied postpellet in corn-soybean meal diets with dried distillers grains with solubles on performance, energy utilization, digestibility, and carcass traits in Ross 708 male broilers. A completely randomized block (pen location) design with 16 treatments arranged factorially (4 XL levels, 2 AA, and 2 AF) was analyzed using mixed models. No significant interactions or main effects were observed for feed intake at 49 d (P > 0.05) but chicks were heavier when consuming diets containing 0 or 8,000 BXU/kg (P = 0.015), high AA (P < 0.001), and 1.17% AF (P < 0.001). Feed efficiency did not vary with XL supplementation (P > 0.05) but was improved in broilers fed the higher AA and AF diet (P = 0.015 for AA × AF). AME, GE, and CP digestibility were assessed at days 17 and 42. There were multiple interactions observed at day 17 with a significant three-way showing that AME and CP digestibility improved when increasing the XL and AF levels in the high AA fed birds compared with the low-density diets. At day 42, XL and AF significantly affected AMEn, GE, or CP digestibility; however, there was a significant interaction between XL and AF. Diets supplemented with 1.17% AF improved AMEn significantly in broilers fed the highest XL level. Breast yield was not affected by treatments, but wing yield decreased with high AA density when diets contained 16,000 BXU/kg without differences for the other diets (P = 0.04 for XL × AA). Effects of XL, AA, and AF interactions on performance and cut-up-part yields have to be considered until day 42 for most of the variables studied. However, at 49 d of age, the dietary AA density and AF did not markedly influence the response to XL in maize-based diets.