Utilização de β-mananase e mananoligossacarídeo em rações de frangos de corte

Abstract

The experiment was conducted to evaluate the use of mannanoligosaccharide (ActiveMOS) and β-mannanase (Hemicell) in diets for broilers. Four hundred male broiler chicks (Cobb-500®) was used, with initial average weight of 42 g, distributed in a completely randomized design with five treatments and eight replicates of 10 birds each. The broilers were reared in sugar cane bagasse, reused of a lot previously housed. The treatments were: T1 - Diet Reference + coccidiostat + growth promotants, T2 - Reference Diet + coccidiostat, T3 - Diet Reference + coccidiostat + β-mannanase, T4 - Diet Reference + coccidiostat + MOS; T5 - Dietary Reference + coccidiostat + β-mannanase + MOS. These characteristics were: protuctive performance (weight gain, feed intake and feed intake : weight gain) and carcass weights, cuts and edible offal. Significant differences were observed (P> 0.05) among treatments for feed intake during the periods from 8 to 14 and 1 to 21 days old. The were significant differences on the gain from 22 to 28 and 36 to 42 days old, but feed conversion was significant in all stages of development. Significant differences were observed (P> 0.05) for the absolute weight (g) and relative (%) of carcass and prime cuts and not noble, except for the absolute weight (g) and relative (%) of the chest. There was no (P> 0.05) difference on the absolute weight (g) and relative (%) of the liver, significant differences for the absolute weight (g) and relative (%) of the heart, gizzard and abdominal fat. This study concluded that both the mannanoligosaccharide and β-mannanase can replace the growth promoters with no change in performance and carcass yield.