DIETETIC FIBER ON THE APPARENT NUTRIENT RETENTION OF HUBBARD AND CRIOLLO NAKED NECK COMMERCIAL BROILERS

The Hubbard and Criollo genotypes were used to evaluate dietetic fibre on the apparent dry matter retention (DMAR), organic matter (OMAR), g ross energy (GEAR) and crude protein (CPAR), in a sub-humid warm clima te (AW(o)). Eighty four male chicks of two weeks of age (42 of the Hub bard commercial genotype and 42 of the Criollo naked neck genotype) ho used in pairs in battery cages were used. The experimental design was a random block according to a factorial 2 x 3 arrangement where the ma in effects were the two genotypes and three levels of crude fibre (5.4 , 7.1 and 10.6%) with seven replications (batteries) per treatment. Di ets were fed ad libitum from 15 days of age and faeces were collected for 3 days after the 21st day. There was no effect of the treatment by genotype interaction for the indicators studied. Results show a negat ive effect (P < 0.01) of the percentage of dietetic fibre on DMAR, OMA R and GEAR. Genotype affected DMAR and OMAR indicating that Criollo ch ickens are less efficient than Hubbards, at least in apparent retentio n of the nutrients assessed under these conditions.