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Effects of environmental temperature and diet supplementation with protease on growth performance and nutrient utilization by broilers

Grant number: 15/15263-2
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): January 01, 2016
Effective date (End): February 28, 2017
Field of knowledge:Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
Principal Investigator:José Roberto Sartori
Grantee:Livia Carrasco Dornelas
Host Institution: Faculdade de Medicina Veterinária e Zootecnia (FMVZ). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil


The objective of the current study is to evaluate the effects of protease supplementation on diet digestibility and growth performance of broilers under thermoneutral condition and heat stress. 480 one-day-old male broilers Cobb will be allotted in a complete randomized design into two temperature controlled rooms with 48 steel cages each. Treatments will be analyzed as a factorial design 2 x 2 x 3 (thermoneutral condition x cyclic heat stress; diets formulated to meet nutritional requirements x diets with crude protein and amino acids below requirements by 6%; increasing levels of protease: 0, 200, 400 ppm) resulting in 12 treatments with 8 replicates with 5 chicks per pen. Diets will be corn-soybean meal based, formulated in order to meet requirements of each growth stage (pre-starter, starter, and growth), for dietary treatments which meet animal requirements, and 6% CP and amino acids below requirements for the low crude protein treatments. Total collection of excreta will be performed to determine nutrient digestibility (dry matter, energy, ether extraction, and nitrogen). Ileal collection will be performed at day 35 of experiment to determine dry matter, energy, ether extraction, nitrogen, and amino acids apparent digestibility of the diets. Growth performance parameters will be obtained (body weight gain, feed intake, feed conversion, and viability). Data will be analyzed by ANOVA (P<0,05) and levels of protease means will be compared by Tukey with significant level at 5%.

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Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
DORNELAS, Livia Carrasco. Effects of environmental temperature and diet supplementation with protease on growth performance and nutrient utilization by broilers. 2017. Master's Dissertation - Universidade Estadual Paulista (Unesp). Faculdade de Medicina Veterinária e Zootecnia. Botucatu Botucatu.

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