HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Dari, R. L. Articles by Jost, H. C. Search for Related Content PubMed Articles by Dari, R. L. Articles by Jost, H. C.

Use of Digestible Amino Acids and the Concept of Ideal Protein in Feed Formulation for Broilers

R. L. Dari^*, A. M. Penz, Jr.^*, A. M. Kessler and H. C. Jost

^* Nutron Alimentos Ltd., Campinas, SP, Brazil 13091-611
Departmento de Zootecnia, Universidade Federal do Rio Grande do Sul, Porto Alegre-RS, Brazil 91540-000

Correspondence: R. L. Dari, E-mail: rdari{at}nutron.com.br

The objective of this study was to evaluate diet formulation based on digestible amino acids (DAA), the formulation of low protein diets supplemented with synthetic amino acids, and L-Thr supplementation to increase the Thr:Lys ratio from 67:100 to 70:100. Two experiments were carried out with Hubbard male broilers from 3 to 6 wk of age. In experiment 1, corn-soybean meal diets containing 20% CP were used. In experiment 2, 20% CP diets were formulated with corn, soybean meal, wheat bran, feather meal, and meat meal. In both experiments, body weight gain and economic evaluations were better for broilers fed diets formulated on DAA. Carcass yields and carcass composition were not significantly affected by formulation procedures. In experiment 2, birds fed diets based on DAA had improved feed efficiency compared with those fed total amino acids (TAA). In experiment 1, a reduction of CP from 20 to 18.2% did not affect broiler performance. It did, however, result in fatter carcasses, lower percentages of breast meat, and lower economic evaluation. In both experiments, performance and economic evaluation were not affected by the Thr:Lys ratio. In experiment 1, however, abdominal fat and carcass fatness were reduced, and, in both experiments, carcass protein level was higher with a Thr:Lys ratio of 70:100 than with 67:100 ratio (P < 0.05).

Key Words: broiler • amino acid • digestible amino acid • protein • ideal protein • carcass composition • formulation

This article has been cited by other articles:

				K. Bregendahl, S. A. Roberts, B. Kerr, and D. Hoehler Ideal Ratios of Isoleucine, Methionine, Methionine Plus Cystine, Threonine, Tryptophan, and Valine Relative to Lysine for White Leghorn-Type Laying Hens of Twenty-Eight to Thirty-Four Weeks of Age Poult. Sci., April 1, 2008; 87(4): 744 - 758. [Abstract] [Full Text] [PDF]