Abstract
ABSTRACT Two experiments were carried out to determine the energy values and the true ileal digestibility of amino acids of nine toasted full-fat soybeans (FFSB), without or with the addition of monocomponent protease. In the first experiment, to determine the energy values, the method of excreta collection was used with 1120 broiler chicks at 14 days old, distributed in randomized blocks in a 10x2 factorial arrangement with nine full-fat soybeans (30% included) plus a control diet (70%) without or with the addition of protease, totaling 20 treatments with 8 replicates and 7 birds per cage. In the second experiment, 1120 broiler chickens from 24 to 28 days of age were distributed in randomized blocks in a 10x2 factor arrangement, with nine full-fat soybeans (40% included) + a protein free diet (60%), without or with the addition of protease, totaling 20 treatments with 8 replicates and 7 birds per cage. Ileal digesta collection was used to determine the true digestibility coefficients and the digestible amino acid content of full-fat soybean. The average values of nitrogen-corrected apparent metabolizable energy (AMEn) and their respective metabolization coefficients (CAMEn) were 3207 kcal/kg and 62.57%, respectively. The average values of digestibility coefficients of crude protein and essential and nonessential amino acids were 86.79, 87.90 and 84.34%, respectively. The inclusion of protease improved (P<0.05) all evaluated parameters. Therefore, its use is recommended in diets containing full-fat soybeans for broiler chickens.
Highlights
For a better utilization of the diets by the animals, besides the chemical and energy composition, the knowledge of the concentration of digestible amino acids (AA) is important, since the amino acids that make up the protein of the feed are not completely available for the animal (Gomes et al, 2010)
From the chemical composition of toasted full-fat soybeans (FFSB) samples, it can be inferred that this feed presents a good profile of crude protein (CP) and ether extract (EE) in addition to reduced crude fiber (CF) content (Table 2)
The gross energy (GE) sample values of FFSB of the present study were higher than those found by Rostagno et al (2011), of 5032kcal/kg, except for the sample 4
Summary
For a better utilization of the diets by the animals, besides the chemical and energy composition, the knowledge of the concentration of digestible amino acids (AA) is important, since the amino acids that make up the protein of the feed are not completely available for the animal (Gomes et al, 2010). It is necessary to determine the digestibility coefficients of the AA in certain feeds, aiming at obtaining the values of digestible AA. This enables the formulation of more effective and accurate diets and reduces negative impact of environmental pollution. It leads a cost reduction since protein is one of the most expensive ingredients. Soybean meal is the main protein source added to the diets. This is more evident in broilers farming, which requires more dense diets with adequate balance of digestible AA. The search for new protein feeds that can replace partially or completely soybean meal in diet formulation is needed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
