摘要
Objetivou-se avaliar o desempenho, a digestibilidade das dietas, a reten o corporal de nutrientes e o desenvolvimento da mucosa intestinal de pintos de corte de 1 a 8 dias de idade, alimentados com dietas contendo n赤veis crescentes de levedura de cana-de-a 迆car. Utilizou-se 300 pintos de corte, com um dia de idade, distribu赤dos em delineamento inteiramente casualizado, composto de cinco tratamentos e seis repeti es de 10 aves. Os tratamentos consistiram de n赤veis crescentes de 0; 1,25; 2,5; 3,75 e 5,0% de inclus o de levedura. N o houve efeito da levedura sobre o desempenho zoot谷cnico. Houve redu o no coeficiente de metabolizabilidade da energia bruta, na energia metaboliz芍vel aparente e a aparente corrigida com os n赤veis crescentes. O n赤vel de 2,09% promoveu menor reten o corporal de prote赤na bruta, enquanto a reten o de gordura foi linear crescente. A altura de vilos e rela o vilo:cripta do jejuno aumentou linearmente, a profundidade das criptas do 赤leo apresentaram menorprofundidade no n赤vel de 2,40% de levedura. A inclus o da levedura de cana-de-a 迆car at谷 5% em dietas de pintos na fase pr谷-inicial n o afeta o desempenho zoot谷cnico, proporciona melhor desenvolvimento da mucosa intestinal; entretanto, reduz a energia metaboliz芍vel das dietas e aumenta a reten o de gordura corporal. The objective was to evaluate the performance, digestibility of diets, body retention of nutrients and the development of intestinalmucosa of post hatching broilers, of one up to eight day old, fed diets containing different levels of sugar cane yeast (Saccharomyces cerevisiae). It was used 300 one day old chicks in a completely randomized design with five treatments and six replicates of 10 birds. The treatments consisted of increasing levels of 0, 1.25, 2.5, 3.75 and 5.0% inclusion of yeast. No effect of yeast on performance. There was a reduction in the coefficients of apparent metabolizable of gross energy, apparent metabolizable energy, apparent metabolizable energy corrected by nitrogen balance with increasing levels. The level of 2.09% results in lower retention of body protein, while the retention of fat was increased linearly. The height of villus and villous height:crypt depth ratio of the jejunum was increased linearly, and the depths of crypts of the ileum had lower depth level of 2.40% yeast. The inclusion of yeast cane sugar levels up to 5% in diets for broiler in the post hatching doesn*t affect the performance and provides better development of the intestinal mucosa in the jejunum, however reduces metabolizable energy of diets and increases greater r