Níveis nutricionais de treonina digestível para poedeiras semipesadas

Abstract

With the objective of determining the requirement of digestible threonine for laying hens from 50 to 66 and 75 to 90 weeks of age, two experiments were conducted at the Center for Experimental Stations of the Federal Technological University of Paraná, Campus Dois Vizinhos. A total of 150 Brown Shaver hens semiheavily a completely randomized design (CRD) submitted to a basal diet containing 2850 kcal / kg, 15.4% CP supplemented with 0.460, 0.490, 0.520, 0.550 and 0.580% of L-threonine (98%), which provided 0.000, 0.027, 0.058, 0.089 and 0.120% of threonine, respectively. The parameters evaluated were feed intake, threonine intake, feed/dozen eggs, feed/egg mass, egg weight, egg mass, percentage of egg components (yolk, shell, albumen, shell thickness and shell weight per unit surface area - PCSA), internal egg quality (Haugh unit, yolk index and albumen index) and specific gravity. In experiment 1, the requirement for threonine was, 520% in the diet, corresponding to 601 mg threonine/hen/day. In experiment 2, to provide the best performance and quality of eggs, hens do not require more than 0.525% of threonine, a consumption of 654.86 mg of threonine/bird/day