InfluÃncia da peletizaÃÃo sobre a adiÃÃo de enzimas e vitaminas em raÃÃes para frangos de corte de 1 a 21 dias de idade / Influence of pelleting on the enzymes and vitamins addition in broiler chickens diets in the period of 1 to 21 days of age

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

It was carried out in the Poultry Farming Sector of the Animal Science Department of the UFLA, an experiment to evaluate the influence of pelleting on the enzymes and vitamins addition in diets for broiler chickens of 1 to 21 days of age. 350 broiler chickens, COBB, males, were used with average initial weight of 47g  2.5g in a completely randomized design, with the treatments in a 3 x 2 factorial arrangement (three diets with or without enzymes) being that, the diets consisted of one mealy ration and two pelleted rations, one with addition of vitamins and minerals after pelleting and the other with addition of vitamins and minerals before pelleting. The time and temperature of pelleting ranged from 05 to 09 minutes and 58ÂC to 62ÂC, respectively. After this process, the pelleted rations were ground, seeking maintain the same particle size of the mealy rations. The performance were evaluated with 10 replicates and the metabolism with 5 replicates each treatment in a density of 5 birds per plot (cage). The diets were formulated with 95% of the nutritional recommendations and fed to the birds with a feed restriction of about 10% of ad libitum intake, which was calculated daily from the average intake of a group of control birds, which were submitted to ad libitum intake of a diet formulated with 100% of the nutritional levels recommended. The enzyme complex utilized was Allzyme VegproÂ, containing the enzymes protease, amylase and cellulase, which were added to the treatments following the manufacturerâs recommendations, of 0.5 kg per ton of ration. At 21 days of age, weight gain and feed conversion were evaluated. The excreta were collected by the methodology of total collection of excreta in the 20, 21 and 22 days for determination of the energy values of the diets and fat and protein digestibility coefficients. The average temperatures, minimal and maximal, recorded in the experimental period, inside the metabolism room were of 25.0ÂC  2.4 and 28.6ÂC  1.7, respectively. According to results, it was observed that weight gain, feed conversion, corrected apparent metabolizable energy and coefficient of digestibility of ether extract showed a significant interaction (P<0.01) between diets and enzymes, where the pelleted diet with enzyme and with addition of vitamins and minerals before pelleting presented better general performance. As regards the coefficient of digestibility of crude protein (CDCP), there was not interaction (P>0.05) between diet and enzyme. There was a significant effect (P<0.05) of the diets on CDCP. There was a significant difference (P<0.05) in relation to the addition of enzymes in the diets. It was concluded that in pelleted rations with addition of vitamins and minerals before pelleting process, there was effect on the performance of the birds, reflecting, in weight gain, feed conversion and in the coefficients of digestibility of crude protein, ether extract and corrected apparent metabolizable energy of the birds.

ASSUNTO(S)

enzimas enzymes peletizaÃÃo frango de corte vitaminas pelleting zootecnia vitamins broiler

ACESSO AO ARTIGO

Documentos Relacionados