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|Título: ||Efficiency of microbial phytase supplementation in dietsformulated with different calcium:phosphorus ratios, supplied tobroilers from 22 to 33 days old|
|Autor(es): ||Naves, L. de P.|
Rodrigues, P. B.
Teixeira, L. do V.
Oliveira, E. C. de
Saldanha, M. M.
Alvarenga, R. R.
Corrêa, A. D.
Lima, R. R.
Microbial phytase supplementation
Broilers - Nutrition
|Data de publicação: ||2014|
|Referência: ||NAVES, L. de P. et al. Efficiency of microbial phytase supplementation in dietsformulated with different calcium:phosphorus ratios, supplied tobroilers from 22 to 33 days old. Journal of Animal Physiology and Animal Nutrition, Berlin, v. 99, n. 1, p. 139-149, 2014.|
|Abstract: ||An experiment was conducted with broilers from 22 to 33 days of age to evaluate the efficiency of six microbialphytases supplemented in diets (1500 FTU/kg) that were formulated with three different calcium:available phos-phorus (Ca:Pavail) ratios (4.5:1.0, 6.0:1.0 and 7.5:1.0). A positive control diet without phytase was formulatedwith a Ca:Pavailratio of 7.5:3.4 to meet the nutritional requirements of the broilers. The P and ash contents of thetibia, magnesium in the plasma, performance, balance and retention of phytate phosphorus (Pphyt), intake oftotal P and nitrogen (N), nitrogen-corrected apparent metabolizable energy and apparent digestibility of dry mat-ter of the diets were not influenced (p > 0.05) by the type of phytase or the dietary Ca:Pavailratio. However, therewas an interaction (p < 0.05) between the phytase type and the Ca:Pavailratio for the retention coefficients oftotal P, Ca and N. Phytase B resulted in the highest Ca deposition in the tibia (p < 0.01). Phytases D, E and Freduced the Ca concentrations in the tibia (p < 0.01) and plasma (p < 0.05). Phytase D increased the P level inthe plasma and decreased the total P excretion (p < 0.01). Phytases E and F increased Ca excretion, while phy-tase A reduced it (p < 0.01). Regardless of the phytase type, increasing the dietary Ca:Pavailratio reduced(p < 0.05) the plasma P concentration and the excretion of total P and N and, conversely, increased (p < 0.05)the plasma concentration, intake and excretion of Ca. For the rearing period evaluated, it is possible to reducethe Pavailof the diet to 1.0 g/kg when Ca is maintained at 7.5 g/kg, and the diet is supplemented with 1500 FTUof phytase A, C, D or E/kg. This diet allows the maintenance of performance and adequate bone mineralization,and it improves the Ca, total P and Pphytutilization in addition to reducing the excretion of N and P into theenvironment.|
|Aparece nas coleções: ||DQI - Artigos publicados em periódicos|
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