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Comparative Bioefficacy of Lysine from L-Lysine Hydrochloride or L-Lysine Sulfate in Basal Diets Containing Graded Levels of Canola Meal for Female Broiler Chickens

G. Ahmad^*, T. Mushtaq^,1, M. Aslam Mirza and Z. Ahmed

^* Sadiq Brothers Poultry, 48-C, Satellite Town, Near Chandni Chowk, Murree Road, Rawalpindi, Pakistan-46000; Institute of Animal Nutrition and Feed Technology, University of Agriculture, Faisalabad, Pakistan-38040; and National Reference Laboratory for Poultry Diseases, National Agriculture Research Council, Islamabad, Pakistan

¹ Corresponding author: tmmirza{at}fsd.paknet.com.pk

A broiler growth assay was conducted to compare the efficacy of L-lysine HCl and L-lysine sulfate at a graded addition of canola meal (CM). A total of 1,440 1-d-old female Hubbard broiler chicks were allotted randomly to 6 dietary treatments each in 4 replicates of 60 birds per pen. The 2 lysine sources (L-lysine HCl and L-lysine sulfate) and the 3 CM levels (10, 15, and 20%) were used in 2 x 3 factorial arrangement in isonitrogenous (19% CP) and equicaloric (2,700 kcal of ME/kg) diets containing 0.96% digestible lysine. The experiment lasted for 42 d, and a single mash diet was used throughout the experiment. The feed intake during the starter phase (1 to 28 d) decreased linearly as the dietary CM level increased with diets containing L-lysine HCl, whereas feed intake increased linearly with increasing dietary CM level with that of lysine sulfate. Gizzard weight as percentage of carcass weight increased linearly (P 0.016) as dietary CM level increased. No significant effect of lysine sources or CM was observed on body weight gain, feed:gain, mortality, carcass weight, breast and thigh yield, and abdominal fat. In conclusion, L-lysine HCl can be replaced with L-lysine sulfate for broiler diets, and CM can be used as up to 20% of the starter (1 to 28 d) and finisher (29 to 42 d) diets without having any adverse effects of broiler performance.

Key Words: L-lysine hydrochloride • L-lysine sulfate • canola meal • low energy and protein • female broiler

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