Resumen de BONE DEVELOPMENT OF BROILER CHICKENS FED DIETS WITH DIFFERENT AMINO ACID AND CALCIUM LEVELS DURING THE STARTER PHASE

Cristiane Soares da Silva Araújo, Silvana Martinez B. Artoni, Lúcio Francelino Araújo, Mário Jefferson Quirino Louzada, Otto Mack Junqueira, Anita Roque Rodríguez

• español

  Se realizaron dos experimentos con el objetivo de analizar los efectos de los diferentes niveles de aminoácidos y de calcio sobre las características óseas de dos líneas de pollos de corte (Avian Farms y Cobb) en la fase inicial de cría. Al final de cada experimento, fueron sacrificadas 2 aves de cada repetición, para colectar las tibias y analizar sus características: peso, largo, grosor de las capas óseas compacta y esponjosa) y la densidad ósea (densitometríaósea). En cada experimento, fueron utilizadas 540 aves, distribuidas al azar, en esquema factorial 3x2, que significa, 3 perfiles de aminoácidos (metionina, lisina y treonina: 100%, 125% y 150% NRC, 1994) y 2 niveles de calcio (75% y 100% NRC, 1994), con 30 aves por repetición. Las aves de la línea Cobb alimentadas con 75% de lo recomendado de calcio presentaron menor densidad ósea. El nivel de calcio, influyó significativamente en el peso y grosor de la capa esponjosa de la tibia. En la línea Avian Farms, los tratamientos aplicados no afectaron la densidad ni las medidas óseas

• English

  Two experiments were conducted in order to evaluate the effects of different dietary amino acid and calcium profiles on the bone characteristics of two chicken strains (Avian Farms and Cobb) during the starter phase. At the end of each experiment, 2 chickens of each replicate were sacrificed and their tibiae were collected for analysis of following bone characteristics: bone measurements (weight, length and thickness of the compact and spongy layers) and bone density (bone densitometry). A total of 540 birds were used in each experiment, divided into fully randomized blocks with a 3 x 2 factorial schemes, i. e., 3 amino acid profiles (methionine, lysine and threonine ­ 100%, 125% and 150% of NRC recommendations, 1994) and 2 calcium levels (75% and 100% of NRC recommendations, 1994), with 30 birds per replicate. Birds of the Cobb strains fed 75% of the recommended calcium allowance showed lower bone density. Calcium level significantly affected the weight and thickness of the spongy layer of the tibia. In birds of the Avian strain, bone density and measurements were not affected by any of the experimental treatments