Exigência de treonina digestível para codornas japonesas em postura

Abstract

This study aimed to determine the threonine requirement for japanese quails fed diets containing threonine levels keeping the relationship amino acids: lysine constant. Treatments consisted of a diet formulated with corn and soybean meal supplemented with amino acids L-Lysine industrial, DL-Methionine, L-Tryptophan, L-Arginine, L-Isoleucine and L-Valine to meet the requirements nutrition for Japanese quails. The relationships amino acids: lysine was 70, 19, 126, 92, 90 and 78% for methionine + cystine, tryptophan, arginine, valine, isoleucine and threonine, respectively. The variables evaluated were: feed intake (g / bird / day), egg production (%), egg weight (g), egg mass (g / bird / day), conversion per egg mass (kg / kg ) and per dozen eggs (kg / dz), weight (g) and percentage (%) of yolk, albumen and shell, shell thickness (mm), Haugh units, specific gravity (g/cm3). It was determined that the threonine requirement for Japanese quails is 0.793% or 200 mg / bird / day, compared with 78% in constant respectively.