<b>Digestible lysine and threonine levels for Lohmann LSL laying hens from 24 to 44 weeks of age</b> - DOI: 10.4025/actascianimsci.v31i1.1387

Abstract

This research had the objective of evaluating the performance and nitrogen balance of commercial laying hens between 25 and 44 weeks of age, fed diets containing different levels of digestible lysine (0.700, 0.800 and 0.900%) and combined with digestible threonine (0.500, 0.550 and 0.600%). The diets contained 16% crude protein. A randomized experimental design was used in a 3x3 factorial scheme (three levels of lysine x three levels of theronine), with five replicates. The experiment unit consisted of a cage with eight hens. Data were submitted to analysis of variance using the statistical software SAS. The different levels of lysine and theronine did not influence (p > 0.05) production, weight of the eggs and nitrogen balance. An interaction was verified between the levels of lysine and theronine (p < 0.05) in the diets regarding feed conversion (kg kg^-1). The levels of 0.800 and 0.550% of digestible lysine and threonine, respectively, enhanced the feed conversion (kg kg^-1) in diets of hens.