ABSTRACT The objective of the current study was to evaluate the effects of three calcium:available phosphorus (Ca:aP) ratios and different supplementation with phytases from different origins on performance and ash, Ca, and P contents in the tibia of broilers. A total of 900 male broilers (22 to 35 days old) were fed ten dietary treatments in a completely randomized design. A 3 × 3 + 1 factorial scheme was used, corresponding to three Ca:aP ratios (4.5:1.0, 6.0:1.0, and 7.5:1.0) and […]

Five hundred and four 1-day-old Cobb broiler chickens were randomly allotted to 18 treatments and fed a semi-purified basal diet (4 g/kg total phosphorus) supplemented with 2 levels of supplemental P (0.5 or 1 g/kg) during 21 days to evaluate performance and bone mineralization; to assess the relative bioavailability of P (RBP) in wheat meal (WM) and roasted (RS) or extruded soybean meal (ES), with or without phytase (0 or 750 ftu/kg diet), using dicalcium phosphate (DC) as standard; and […]

The experiment was conducted to evaluate the addition of phytase on productive performance and egg quality of Japanese quails fed diets containing different levels of phytase. It was used 320 Japanese quails at 167 days of age, weighing 182.3 ± 3.8 g distributed in a completely randomized design with four experimental diets and eight repetitions of ten birds per experimental unit. Diets were formulated from a basal diet (control) and they were corn and soybean meal based, without supplementation, added […]

The experiment was carried out aiming at evaluate the effect of using ractopamine and phytase in diets for swines at the end of the finishing period on performance, carcass characteristics and mineral composition on the third metacarpus bone. It was used 240 barrows with initial weight 100.7 ± 3.9 kg in a random block design, in a 2 × 3 factorial arrangement, with two levels of ractopamine (5 ppm and 10 ppm) and three levels of phytase (0, 500, and […]

The objective of this study was to evaluate the effects of ractopamine and enzyme phytase on the performance and carcass characteristics of finishing pigs. Three hundred and fifty-four commercial type barrows were used from a single source with 94.1 ± 5.7 kg initial body weight in a randomized complete block design, with six treatments and five replications with 11 or 12 animals per experimental unit evaluated. The following feeds were: control diet based on tables of nutritional requirements; (A) diet […]

The objective of this work was to compare the efficiency of different levels of phytase with the use of inorganic phosphate (dicalcium phosphate) when added to diets with or without defatted rice bran (DRB). One hundred and twenty eight pigs with average initial weight of 21.6 ± 2.4 kg were housed in collective boxes for the pig performance evaluation in the growing and finishing phase. The pigs were slaughtered with an average weight of 95.42 ± 5.3 kg and the […]

The objective of this trial was to determine the adequate level of the phytase (0, 300, 600 and 900 PU/kg of the diet) to be added in corn-soybean meal diets with two crude protein (CP) levels, one at the animal requirements (18%CP) and another at smaller level (16% CP), for the most effective nitrogen bioavailability, of the energy and of the macro minerals, and also to observe in which of these diet protein levels the phytase has larger effect. Twenty-four […]