Abstract

GONZALEZ-VAZQUEZ, Alfredo et al. Food supplementation with growth promoters in Cobb 500 broilers. J.Selva Andina Anim. Sci. [online]. 2020, vol.7, n.1, pp.3-16. ISSN 2311-2581.

The present investigation was carried out in the Andil enclosure belonging to the Jipijapa canton in Ecuador, with the objective of evaluating food supplementation with growth promoters in Cobb broilers 500 males and females. The experiment was implemented in a conditioned shed, under an experimental design of Fully Randomized Blocks (DBCA) with three repetitions, with 18 birds per treatment, where sex was considered independently. 216 chickens / 1-day-old sex (432 chickens) were used, distributed in four treatments: T₁: oxytetracycline (control, 1mL / L), T₂: probiotics plus enzymes (2.0 g / kg), T₃: organic acid (1.0 mL / L) and T₄: acetic acid (banana vinegar) (1.0 mL / L). The response variables were body weight (BW), food consumption (FC), weight gain (WG), feed conversion (FConv) and bird mortality. For the analysis of variance, the GLM SAS proc was used. The results showed differentiated responses between males and females for BW, FC, WG and FConv. Acetic Acid had a better response to Organic Acid. In males, the antibiotic, acetic acid and probiotic are the best treatments for weight gain compared to organic acid. The analysis of partial budgets, of the treatments evaluated, for males showed that the best profitability was for oxytetracycline (T₁) in males. The use of the probiotic + enzymes (T₄), had a benefit of USD 0.45, less USD 0.03 than oxytetracycline. The profitability of oxytetracycline was 45.18% at a production cost per lb of USD 0.59. Unlike the treatments with acetic acid (T₃) and probiotic + enzyme (T₄) that showed a margin of profitability of less than 21%. In contrast in females, the best economic income was treatment with probiotic + enzyme (T₄), with 309 lb and a gross income of USD 265.74 and a net profit of USD $ 62.60, which gave a USD / B ratio $ 1.31.

Keywords : Body weight; food consumption; weight gain; nutritional conversion; sexage, probiotic; organic acid; antibiotic.

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