Using the enzyme phytase in feed for laying Japanese quails / Uso da enzima fitase em ração para codornas japonesas em postura

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

There were two experiments to evaluate the effect of adding the enzyme phytase in the diet on the performance and eggs quality (experiment I) and the use of the feed ingredients (Experiment II) for laying Japanese quails. In the first experiment were used 320 quail females of Japanese sub- species, with 167 days old, initial weight of 182.3 + 3.8 g and rate of egg production of 89.0% and is divided into four and eight treatments repetitions of ten birds each. In experiment II were used 200 quail females of Japanese sub-species with 251 days old, average weight of 187.2 + 6.0 g and rate of egg production of 84.8%, distributed in four treatments and five repetitions of ten birds each. In both experiments using the completely randomized design. The treatments were: T1 - basal diet - RB - (given the nutritional requirements of quails and recommendations of the matrix of the enzyme phytase), T2 - RB + 200 U of phytase; T3 - RB + 400 U of phytase, T4 - RB + 600 U of phytase. The diets were formulated based on corn and soybean meal. The parameters of performance and eggs quality were evaluated in the experiment I: feed intake, egg production per bird day, eggs mass, efficient use of phosphorus for eggs mass, feed conversion per eggs mass and per eggs dozen, egg production per bird housed, viable eggs per bird day, feasibility studies, changes in body weight, lysine, methionine + cystine and threonine intake, egg weight, yolk weight, albumen weight, shell weight, percentage of yolk, albumen and shell, specific gravity and percentage of commercial eggs. Statistical analysis was made using the linear regression models, quadratic and Linear Response Plateau (LRP) as the best fit obtained for each variable. The best feed conversion occurred at levels of 437 (CAMO) and 400 (CADZ) U of phytase, however, considering the daily production of eggs per bird and production of viable eggs per bird day, the highest levels were 335 and 368 U of phytase, respectively. For MO the highest level of supplementation of phytase gave the best result. Meanwhile on the efficiency of the use of P, the level of 463 U of phytase was best for the composition of MO, while the other variables of performance and quality of eggs, filled with this level, in its ideal level of phytase. To determine the use of nutrients and energy in the diet (experiment II) was used the method of total collection of excreta. Were determined the values of apparent metabolizable energy and energy apparent metabolizable corrected by the retention of nitrogen, and metabolizability coefficient of apparent metabolizable energy and energy apparent metabolizable corrected by nitrogen balance. It was also calculated the amount of phosphorus, calcium and nitrogen detained by bird day. In general there was an improvement in the utilization of energy in the diet with phytase supplementation. Levels of 195 and 186 U of phytase are best designed to provide greater use of broiler apparent and apparent corrected by nitrogen balance. The level of 600 U of phytase the lowest nitrogen excretion, however, 368 U of phytase was enough for maximum retention of nitrogen by quails. The best level in the experiment I was 463 U of phytase and the experiment II was of 368 U of phytase.

ASSUNTO(S)

ovo de codorna fósforo qualidade phosphorus nutricao e alimentacao animal egg production quality quails eggs energia produção de ovos energy

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