Exigência de valina digestível para frangas, poedeiras e codornas

Abstract

The objective of this work was to estimate the nutritional requirement of digestible valine for pullets in the rearing, rearing, laying stages in the production phase, Japanese quails in the production phase and quail cuttings. Nine experiments were performed, six of them with pullets in stages 0 to 3, 4 to 6, 7 to 12, 13 to 15 and 16 to 17 weeks of age and posture phase (26 to 46 weeks), an experiment with Japanese quails Postural stage (135 days) and two experiments with European quails in stages 1 to 21 and 22 to 42 days. In the experiments with laying hens, 432 birds were used in each phase and 420 in the laying experiment. The levels of digestible valine used in the experiments with laying hens were 0,76; 0,73; 0,69; 0,61; 0,61 and 0,71%, forming six treatments with six replicates of 12 birds per plot in all experiments, except in the laying phase, with 7 replicates of 10 birds per plot. In the Japanese quail experiment, a total of 288 quails were distributed in six treatments of six replicates with eight birds each. The levels of digestible valine used consisted of 0,69; 0,75; 0,81; 0,87; 0,93 and 0,99%. In the experiment with European quails a total of 864 quails were distributed in six treatments of six replicates with twelve birds each. The digestible valine levels used were 0,99; 1,05; 1,11; 1,17; 1,23 and 1,29%. Feed consumption (g/a/d), final weight (g/a), weight gain (g) and feed conversion ratio (g/g) for growing and egg quality birds were analyzed for birds in production. There was influence of the treatments in the experiment from 0 to 3 weeks, on body weight, weight gain and feed conversion (P<0,05). In the 4 to 6 week stage, valine levels affected body weight, weight gain and feed conversion (P<0,05). During the 7 to 12 week phase, valine levels influenced body weight, weight gain and feed conversion (P<0,05). In the 13 to 15 week experiment, the valine levels used influenced weight gain and feed conversion (P<0,05). From 16 to 17 weeks, 0,54% of digestible valine was sufficient to support the demand of birds, since no effect was verified on body weight, weight gain, feed intake and feed conversion. In the egg laying phase, the levels of valine used affected egg production, feed conversion per dozen eggs and shell weight (P<0,05). There were influence of the treatments in the experiment with Japanese quails on egg production, egg mass, conversion by mass, conversion per dozen, Haugh unit, bark thickness, bark weight, bark percentage and specific gravity (P<0,05). In the quail experiments, the influence of the valine levels studied in the 1 to 21 days phase on final weight, weight gain and feed conversion (P<0,05) was observed. In the phase of 22 to 42 days, there was similar effect to the previous phase. A 0,79% (141,56mg/d) diet is recommended for pullets from 0 to 3 weeks, 0,72% (268mg/d) for pullets from 4 to 6 weeks, 0,70% (412,93mg/d) for pullets from 7 to 12 weeks; 0,68% (422,96mg/d) for pullets from 13 to 15 weeks, 0,54% (419,63mg/d) for pullets from 16 to 17 weeks and 0,78% (712mg/d) laying hens from 26 to 46 weeks, 0,82% (262mg/d) of digestible valine for Japanese laying quails, 1,17% (203,34mg/d) of 1,15% (545,1mg/d) a of digestible valine for European quails in the 1 to 21 days phase and from 22 to 42 days, respectively.