Níveis de treonina em dietas para codorna japonesa em postura / Threonine levels in diets for laying japanese quail in posture

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The experiment was carried out to estimate the level of digestible threonine for laying japanese quail in posture. It was used four hundred quails, with 57 days old and with averaging 75.50% of the rate egg production, during 63 days. A complete randomized experimental design was used with five treatments, eight replicates and ten quail per experimental unit. The basal diet was deficient in threonine, containing 20% of crude protein, 2.910 kcal of ME/kg and supplied with five levels of L-threonine 98% (0.018; 0.074; 0.128; 0.183 and 0.239%), corresponding of digestible threonine: digestible lysine ratios 0.65; 0.70; 0.75; 0.80 and 0.85, respectively to compose the experimental treatments. The following parameters were evaluated: feed intake (g/quail/day), threonine intake (mg/quail/day), egg production (%), production of commercial eggs (%), egg weight (g), egg mass (g/quail/day), feed conversion (kg feed/kg egg), feed conversion (kg feed /egg dozen), weight gain (g), egg quality (yolk (g and %), albumen (g and %) and shell (g and %)), egg length and width (mm) and specific gravity (g/cm3). Linear effect (P<0.05) was only observed in the threonine intake. It is ended that, the japanese quail doesn t demand more than 0.65% of digestible threonine to provided the best productive performance and quality of eggs, for a consumption of 149.2 mg of digestible threonine/day or a daily consumption of 14.34 mg of digestible threonine/g egg, corresponding to the digestible threonine: digestible lysine ratio of 0.65.

ASSUNTO(S)

alimentação e rações threonine nutricao e alimentacao animal aminoácidos feeding and feeds codorna treonina amino acids quail nutrição animal animal nutrition

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