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 Google Scholar Google Scholar Articles by Beck, C. R. Articles by Russell, G. B. Search for Related Content PubMed Articles by Beck, C. R. Articles by Russell, G. B.

Is the Cystine Content of the Diet of Concern for Broilers from 0 to 21 Days of Age?

Department of Dairy and Poultry Sciences, University of Florida, Gainesville, FL 32611-0930; Phone: (352) 392-1932; FAX: (352) 392-3047

Correspondence: R. H. Harms

Three experiments were conducted to determine whether Cystine (Cys) was of concern for the broiler chick from 0 to 21 days of age. Chicks received various levels of methionine (DL-Met) both with and without supplemental Cys. A basal diet containing o. 30% Cys was used in Experiment 1; another containing 0.25% was used in Experiments 2 and 3. The addition of supplemental DL-Met significantly improved weight gain (WG), feed intake (FI), and feed efficiency (FE) of broilers to 21 days of age. However, supplemental Cys did not affect these parameters. These data indicate that the NRC recommendation of 0.40% Cys for the female broiler from 0 to 21 days of age is too high.

Key Words: Amino acid requirement • broiler • cystine • methionine