Digestible methionine plus cystine and relation digestible methionine plus cystine: lysine for japanese quails

Abstract

This research had the purpose to determine the best level of digestible methionine plus cystine and the best relation of digestible methionine plus cystine:digestible lysine in different levels of protein for laying Japanese quails. 400 laying Japanese quails, with 45 days of age were used in a completely randomized design, with a factorial 2 x 5, two crude protein levels (19,5% and 21,5%) and five levels of digestible methionine plus cystine (0,60%; 0,67%; 0,74%; 0,81% e 0,88%), with five replicates and eight quails per experimental unity. There were analysis of the posture rate (%), egg average weight (g) egg mass (egg grams/bird/day), feed intake (g/bird/day), feed conversion (ration g/ egg g), yolk weight and percentage (g and %), egg white weight and percentage (g and %) and shell weight and percentage (g and %). For the 19,5% level of protein, 0,60% of digestible methionine plus cystine and 0,66% of the relation of digestible methionine plus cystine:digestible lisyne were enough to optimize production. For the 21,5% level of protein, 0,851% of digestible methionine plus cystine and relation of digestible methionine plus cystine:digestible lysine of 0,935% with daily intake of 223,3 mg/quail suggested a better egg production for the quails.