Comparação de programas de alimentação para frangos de corte: 4 e 14 fases

• Autor(a) principal: Bueno, Camila Ferreira Delfim [UNESP]
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/113772
• topic: Frango de corte; Frango de corte - Nutrição; Lisina na nutrição animal; Corpo - Composição; Desempenho; Body composition

Feed costs in the production of broilers revolve around 60-70 %. This value varies according to the cost of each ingredient and the percentage thereof to meet the requirements of animals. In Brazil the feeding programs are used most of 3 and 04 phases. However, this system of the period the birds given below or above the nutrient requirement. A solution to this impasse is the use of feeding programs with more stages, but there are no studies evaluating the feasibility of this system in Brazil. The aim of our study animal performance, carcass and commercial cuts, body composition, nitrogen excretion and economic viability of fed birds was to evaluate according to a program of 14 stages compared to 4 phases. We used 480 broiler one day old Cobb strain. The birds were distributed in a completely randomized design in a factorial 2x2 (gender: male and female; feeding program: 4 and 14 phases). Each treatment consisted of six replicates of 20 birds each. Two premixes diets (A and B) were used, so that the diet met the requirements at the beginning of the growing period and B at the end. The pre-mixes A and B were combined to meet the requirement of lysine using a method specific formulation. Nutritional requirements were determined using the software Avinesp. The performance was evaluated for the periods 1-21, 22-42 and 1-42 days of age by means of live weight (g), feed intake (g), protein intake (g), weight gain and feed conversion. Carcass yield and commercial sections was performed at 42 days. We determined the protein deposition (g) and body fat (g), by comparison at the beginning and the end of the experimental phase slaughter. Nitrogen excretion was evaluated between 1-42 days. In economic analysis, the average weight gain and feed conversion for each treatment were combined with the costs of each diet and live weight price of economic variables to estimate food costs, gross margin and profitability. There was no interaction ...