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Veterinary Medicine International
Volume 2010, Article ID 964076, 9 pages
Research Article

Assessment of the Efficacy of L-Lysine Sulfate vis-à-vis L-Lysine Hydrochloride as Sources of Supplemental Lysine in Broiler Chickens

Department of Animal Nutrition, Faculty of Veterinary & Animal Sciences, West Bengal University of Animal & Fishery Sciences, 37 Kshudiram Bose Sarani, Kolkata 700037, India

Received 25 April 2010; Accepted 10 June 2010

Academic Editor: Sagar M. Goyal

Copyright © 2010 Vijay Bahadur et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In this study the effects of L-lysine hydrochloride (containing 78.8% available lysine as crystalline lysine) and L-lysine sulfate (containing 51% available lysine in bacterial cell mass) as source of supplemental lysine in broiler chickens was assessed. The basal diet was supplemented with either L-lysine hydrochloride or L-lysine sulfate to meet lysine requirement. Lysine supplementation irrespective of source improved ( 𝑃 < . 0 5 ) live weight and food conversion. Live weight and food conversion ratio of the L-lysine sulfate group was superior ( 𝑃 < . 0 5 ) to the L-lysine hydrochloride group. Supplementation of lysine to the basal diet improved breast meat yield ( 𝑃 < . 0 5 ). Meat protein content and protein accretion increased ( 𝑃 < . 0 1 ) when L-lysine sulfate was supplemented. Nutrient metabolizability, N retention, protein utilization efficiency and live weight gain : lysine intake ratio also improved ( 𝑃 < . 0 1 ) with L-lysine sulfate. A fasting trial conducted after the completion of the feeding trial indicated that the birds receiving L-lysine sulfate retained more of their live weight than the control and the L-lysine hydrochloride dietary groups ( 𝑃 < . 0 5 ). It was concluded that due to the retained bacterial cell mass, L-lysine sulfate may be a superior source of supplemental lysine than L-lysine hydrochloride for broiler chickens.