2011, Number 4
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Vet Mex 2011; 42 (4)
Evaluation of three feeding programs for broilers based on sorghum-soybean diets with different protein percentages
Santiago GR, Cortés CA, López CC, Ávila GE
Language: English/Spanish
References: 26
Page: 299-309
PDF size: 186.25 Kb.
ABSTRACT
In order to evaluate performance of broiler chickens, two experiments with Ross 308 broiler chicks from 1 to 49 days of age
were conducted. In both experiments six treatments and three replicates with 30 birds each, with factorial arrangement 2 x
3 were evaluated; diets with and without reduction of 2 percentile units of crude protein was one factor and the other factor
was three-phase feeding programs: two phases (0-21 and 22-49 days of age), three phases (0-21, 22-42 and 43-49 days of
age) and four phases (0-7, 8-21, 22-35 and 36-49 days of age). In Experiment 1, sorghum + soybean meal diets were used,
and in Experiment 2, sorghum + soybean + meat meal + corn yellow gluten meal were used. In both experiments, the diets
included the synthetic amino acids; in Experiment 1, lysine, methionine and threonine were administered, and in Experiment
2, lysine, methionine, tryptophan, threonine and arginine. In Experiment 1, results indicated that growth was similar (P › 0.05)
between diets and feeding phases. The results of feed conversion were better in the four-phase program (P ‹ 0.05). Carcass,
breast and leg with thigh yields, as well as carcass protein and fat did not show differences (P › 0.05) between factors or
interaction effect. In Experiment 2, the results on weight gain, feed conversion, carcass, breast, leg with thigh and total fat
yields were similar (P › 0.05) between factors. These results indicated that broilers fed diets with and without reduction of
two percentile units of crude protein in 2, 3, and 4-phase feeding obtained similar performance. The formulation of protein
reduced diets, supplemented with synthetic amino acids in each phase, were efficient for performance and carcass yield.
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