The study aimed to evaluate the effect of organic acids and the combination of organic acids and essential oils on performance of replacement pullets hens. 360 animals from Hy-Line Brown lineage with eight weeks of age were distributed in a completely randomized design with four treatments and ten replicates. The experiment lasted 63 days. The treatments (diets) were: Treatment 1 - negative control (no growth promoter); Treatment 2 - positive control (with growth promoter); Treatment 3 – basal ration + organic acids; Treatment 4 – basal ration + organic acids + essential oils. The variables evaluated were the initial and final weights, weight gain, accumulated consumption and feed conversion. There was no significant effect of treatment on any of the investigated parameters. It was concluded that the inclusion of organic acids or a combination of acids and essential oils do not affect the productive performance of replacement pullets.
SUMMARY The aim of this experiment was to evaluate the performance, egg quality, and bone quality of commercial white-egg layer hens in the second production cycle fed diets containing organic and inorganic minerals and two limestone particle sizes. A total of 215 birds with an average weight of 1.527 ± 0.092 kg were distributed in a completely randomized design in a 2 × 2 factorial arrangement (two mineral sources and two limestone particle sizes) with six replicates. The following four treatments were tested: T1 = inorganic minerals + 100% fine limestone; T2 = inorganic minerals + 50% fine limestone + 50% coarse limestone; T3 = organic minerals + 100% fine limestone; and T4 = organic minerals+ 50% fine limestone + 50% coarse limestone. No significant interaction occurred between the studied factors for any variable. Egg production, egg mass, bone resistance and bone deformity were higher with organic supplementation. Eggshell weight, percentage of eggshell, and specific gravity were higher in the treatments with the fine+coarse limestone association. In conclusion, organic mineral supplementation improves the performance based on egg production and egg mass. The association between fine and larger-sized limestone improves the external quality of eggs. The use of organic minerals improves the bone quality of birds in the second production cycle.
RESUMO-Objetivou-se com esse experimento avaliar os efeitos dos ácidos orgânicos, óleos essenciais e de um simbiótico, em substituição aos antimicrobianos (promotores de crescimento) sobre o desempenho, qualidade de ovos e viabilidade econômica da produção de poedeiras comerciais semipesadas. Foram utilizadas 240 poedeiras Hy-Line Brown, às 32 semanas de idade, com peso médio 1,650 ± 0,034 kg, em um delineamento inteiramente casualizado, com quatro tratamentos de dez repetições cada. O experimento teve duração de 140 dias, divididos em cinco períodos. Foram empregados os seguintes tratamentos: tratamento 1-controle negativo (sem promotor de crescimento); tratamento 2-controle positivo (com promotor de crescimento-Virginiamicina); tratamento 3-Ração basal + ácidos orgânicos + óleos essenciais; e tratamento 4-Ração basal + simbiótico. Não houve efeito significativo dos tratamentos sobre as variáveis: consumo de ração, produção, peso dos ovos, massa de ovos, conversão por massa de ovos e conversão por dúzia de ovos (P > 0,05). Concluise que a associação de ácidos orgânicos e óleos essenciais, e o simbiótico, podem substituir os promotores de crescimento sem alterar o desempenho e a qualidade dos ovos de poedeiras comerciais semipesadas. O uso de simbiótico na dieta (T5) proporciona uma maior margem bruta quando comparado com os demais tratamentos.
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