| Autor: |
da Silva CA; Department of Zootechnology, Center of Agrarian Sciences, State University of Londrina, Londrina 86057970, Brazil., Callegari MA; Akei Animal Research, Fartura 18870970, Brazil., Dias CP; Akei Animal Research, Fartura 18870970, Brazil., de Souza KL; Akei Animal Research, Fartura 18870970, Brazil., de Carvalho RH; Department of Zootechnology, Center of Agrarian Sciences, State University of Londrina, Londrina 86057970, Brazil., Alebrante L; DSM Nutritional Products Ltda., Jaguaré 05321900, Brazil., da Silva Martins CC; DSM Nutritional Products Ltda., Jaguaré 05321900, Brazil., Heck A; DSM Nutritional Products Ltda., Jaguaré 05321900, Brazil., Fascina VB; DSM Nutritional Products Ltda., Jaguaré 05321900, Brazil. |
| Abstrakt: |
The effects of increasing doses of bacterial phytase ( Citrobacter braakii ) on performance and carcass characteristics of growing-finishing pigs was evaluated. A total of 120 barrows weighing 25.16 ± 2.80 kg and 68 days old were submitted to five treatments: positive control diet (PC) containing inorganic phosphorus (P) and limestone (Ca); negative control (NC) with reductions in P (by 0.13%) and Ca (by 0.11%); and three NC diets supplemented with 1500 (NC15), 3000 (NC30) and 4500 (NC45) units of phytase (FYT)/kg. The daily weight gain (DWG) in growth phase I (68-91 days) was higher in the PC, NC15 and NC30, compared to the NC (1.06, 1.06, 1.06 vs. 0.95, respectively). The DWG in finishing phase II (141-156 days) was higher in the NC15 (1.20 kg) and NC30 (1.14 kg) than in the NC45 (0.94 kg). The final weights (LW156) in the NC15 (122.95 kg LW) were higher than NC (116.47 kg LW) and NC45 (114.43 kg LW). Over the entire period, a quadratic effect (2012 FYT) was observed for the DWG. The increasing levels of phytase in corn and soybean meal-based diets improved the DWG and carcass traits; however, the addition of more than 3000 FYT/kg of feed should be carefully studied to determine enzyme viability. |
