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Influence of dietary phosphorus level on growth performance in chicks given corn‐soybean diet supplemented with amylase and acid protease
Author(s) -
KOBAYASHI Tetsuya,
MURAI Atsushi,
OKADA Toru,
OKUMURA Junichi
Publication year - 2002
Publication title -
animal science journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.606
H-Index - 38
eISSN - 1740-0929
pISSN - 1344-3941
DOI - 10.1046/j.1344-3941.2002.00030.x
Subject(s) - amylase , protease , food science , phosphorus , chemistry , enzyme , zoology , biology , biochemistry , organic chemistry
Two experiments were conducted to determine if dietary amylase and acid protease supplementation improves the nutritive value of corn‐soybean diet, and whether the dietary inorganic phosphorus (P) level affects the growth‐promoting effect induced by the enzyme supplementation in chicks. In the first experiment, 4‐day‐old Single Comb White Leghorn male chicks were given a corn‐soybean diet supplemented with amylase and acid protease for 10 days. Dietary amylase addition produced a significant improvement in growth and food efficiency, whereas acid protease had no effect on these parameters. Although there was no significant interaction between amylase and acid protease, the combination of the two enzymes produced the greatest improvement in growth performance. In contrast, neither enzyme influenced the metabolizable energy value or nitrogen balance. In the second experiment, chicks were given corn‐soybean diets having low, medium and high levels of inorganic P (3.5, 4.3 and 5.1 g/kg, respectively), supplemented with both enzymes. There were significant interactions between the dietary inorganic P level and enzyme supplementation on final bodyweight, bodyweight gain and food intake. Enzyme supplementation significantly improved chick growth at the medium inorganic P level, but not at the low or high levels. Although the thigh bone ash content and serum P concentration were improved as the dietary inorganic P level increased, enzyme supplementation had no influence on these parameters. In conclusion, the present results indicate that dietary amylase and acid protease have beneficial effects on growth performance in chicks given corn‐soybean diet. The dietary inorganic P level affects the growth response to dietary amylase and acid protease supplementation.