Abstract
The main purpose of this work was to evaluate the effects of supplementation of laying hen diets with increasing levels of enzymatic complex composed of α-amylase, β-glucanase, cellulase, xylanase, protease and phytase in the forms “on top”, with reductions in the levels of PB, MS, Ca, P available and amino acids. Semi-heavy 384 layers were used with Isa Brown hens, with an initial age of 29 weeks, distributed in six treatments with eight replications, with eight birds per experimental plot, using a completely randomized design (CRD) with sub installments on time (4 periods of 28 days each). The treatments were: Positive Control (PC) 2.750 kcal kg-1 MS, 17.2% PC and 0.41% available P; Negative Control (NC) 2.600 kcal kg-1 MS, 16.7% PC, 0.26% available P; Positive Control + 350 g ton-1 of feed of enzymatic complex (PC350); Negative Control + 250 g ton-1 of feed of enzymatic complex (NC250); Negative Control + 350 g ton-1 of feed of enzymatic complex (NC350) and; Negative Control + 500 g ton-1 of feed of enzymatic complex (NC500). The variables analyzed for growth performance were: feed intake (g bird-1 day-1), egg production (% bird-1 day-1), average egg weight (%) and feed conversion per egg mass (kg kg-1 of feed/eggs). The internal and external quality variables of the analyzed eggs were shell thickness (mm), bark percentages of albumen and yolk, Haugh unit and specific gravity (g cm-3). The addition of enzymatic complex did not interfere in the results of zoo-technical importance or quality of eggs from hens aged 29-44 weeks. Increased consumption of feed/bird/day was enough to supply the reduced nutritional levels of NC diets and maintain balance in the results to the rest of the variables. For some growth performance variables sometimes during the trial period, a negative influence of the inclusion of high levels of enzymatic complex was observed where the NC350 and NC500 diets had a high feed intake and a worst feed conversion than the other diets.
Highlights
The main purpose of this work was to evaluate the effects of supplementation of laying hen diets with increasing levels of enzymatic complex composed of α-amylase, β-glucanase, cellulase, xylanase, protease and phytase in the forms “on top”, with reductions in the levels of Proteína Bruta (PB), MS, Ca, P available and amino acids
LEE et al (2014), utilizando dietas a base de milho e farelo de soja e reduzindo energia e proteína em uma dieta e energia, proteína e fósforo em outra, com e sem adição de complexo enzimático no nível de 500 mg kg-1 de ração, não observaram efeito positivo para o peso médio dos ovos
GALIK & HORNIAKOVÁ (2010), com dieta controle a base de trigo, centeio, cevada, soja e complexo vitamínico mineral e outra dieta com inclusão de xinalase e betaglucanase, também não verificaram, para peso médio dos ovos, diferença significativa entre os tratamentos
Summary
Ricardo Cruz Vargas*, Adriano Geraldo, Tatiana Cristina Rocha, Israel Marques Silva, Samuel Piassi Teles, Filipe Soares Nogueira, Carlos Alberto de Carvalho e Rogerio Amaro Gonçalves. Foram utilizadas 384 poedeiras semipesadas da linhagem Isa Brown, com idade inicial de 29 semanas, distribuídas em seis tratamentos com oito repetições, sendo oito aves por parcela experimental, utilizando o delineamento inteiramente casualizado (DIC) com parcelas subdividas no tempo (4 períodos de 28 dias cada). As variáveis analisadas de desempenho zootécnico foram: consumo de ração/ave/dia, produção de ovos/ ave/dia, peso médio do ovo e conversão alimentar por massa de ovos. A inclusão do complexo multienzimático não interferiu nos resultados de importância zootécnica nem na qualidade dos ovos de poedeiras com idade entre 29 a 44 semanas de vida. O aumento no consumo de ração/ave/dia foi suficiente para suprir os níveis nutricionais reduzidos das dietas CN e manter em equilíbrio os resultados para o restante das variáveis. Para algumas variáveis de desempenho zootécnico, em alguns momentos, foi possível observar a influência negativa da inclusão de altos níveis do complexo multienzimático. PALAVRAS-CHAVE: avicultura de postura, protease, xilanase, fitase, qualidade do ovo
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