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| Author(s): |
Tatiane Souza dos Santos
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Botucatu. 2016-06-30. |
| Institution: | Universidade Estadual Paulista (Unesp). Faculdade de Medicina Veterinária e Zootecnia. Botucatu |
| Defense date: | 2016-06-24 |
| Advisor: | José Roberto Sartori |
| Abstract | |
This study aimed to evaluate the effect of three commercial phytases derived from Escherichia coli, in diets with reduced levels of available phosphorus, on performance, alkaline and acid phosphtases in serum, calcium and phosphorus in plasma and bone parameters (bone density, bone strength and ash) of broilers at 35 d old. Two thousand one hundred male Cobb®500 broilers were housed in 70 pens in a completely randomized design in factorial arrangement, reared to 35 d old divided into starter phase (I) and the grower phase (G). In treatments positive control* (PC*) and negative control*(NC*) was practiced nutritional value of phytase recommended by the manufacturer (0.12% aP) in relation to positive control (PC) and negative control (NC) treatments. The factorial design was 2x4+2: two levels of available phosphorus (aP) (PC* - 0.33% (S) and 0.28 % (G)) and (NC* - 0.23% (S) and 0.18% (G)) × phytases (A, B, C, without) + PC (0.45 (S) and 0.40% (G) aP without phytase) and NC (decrease of 0.10 of aP: 0.35 (S) and 0.30% (G) aP without phytase) for a total 10 treatments with seven replicates. The absence of phytase in the diet NC* promoted the worst results for performance and bone quality, and increased the level of alkaline phosphatase and calcium in the blood in response to low levels of available phosphorus in diet. The inclusion of phytase in diets PC* improve the performance and increased availability of minerals for bone development. Thus, increased the bone density of the tibia and femur, bone strenght and bone ash. It is concluded that the inclusion phytase in diets PC* was sufficient to ensure good performance and bone quality. It is recommended, while the use of phytases for broiler use only the nutritional value of phytase (-0.12% aP) without additional reduction of available phosphorus in the diets. (AU) | |
| FAPESP's process: | 14/27175-8 - EFFECT OF BACTERIAL PHYTASES ORIGIN ON PERFORMANCE AND BONE QUALITY BROILER |
| Grantee: | Tatiane Souza dos Santos |
| Support Opportunities: | Scholarships in Brazil - Master |