[Show abstract][Hide abstract] ABSTRACT: The effects of full-fat extruded soybean at different temperatures (FES) on performance of broiler chickens were evaluated in this trial. Isonutritive diets were formulated to meet broiler requirements in the growing (22 - 35 days old) and finishing (36 - 45 days old) phases. The experimental treatments consisted of four soybean extrusion temperatures (125, 130 135 and 140 degrees C) with nine replicates of 30 birds. The variables investigated were: feed intake, weight gain, feed:gain ratio and carcass composition (leg yield. breast meat yield and abdominal fat). In both phases, no significant effect of the treatments on the variables was detected. Soybean extruded at temperature of 125 to 140 degrees C can be used in broiler chickens diets after 22 days old.
No preview · Article · Nov 2005 · Revista Brasileira de Zootecnia
[Show abstract][Hide abstract] ABSTRACT: Two experiments were conducted with the objective of evaluating the lysine requirements for Ross broilers, males, from 22 to 42 and 43 to 49 day s old, maintaining 71% met + cys: lys ratio. Nine hundred broilers averaging initial body weight of 780 g at 22 days old and 2.556 g at 43 days old were used in each experiment and allotted to a completely randomized experimental design, with six treatments, six replicates and 25 birds by experimental unit. The treatments consisted of six different synthetic lysine levels, according to the phase and the fixed ratio. Minimum nutrition requirements, except lysine and met + cys, were met. Feed intake, body weight gain, feed gain ratio, carcass yield and the prime cuts yield were evaluated. The lysine requirements were estimated by the regression models. Considering the performance data, the nutritional requirements of total lysine were of 1.140% for maximum performance, in the period from 22 to 42 days old, and of 1.024% for maximum performance and carcass and breast yield, in the period from 43 to 49 days old.