<b>Performance and economic viability of broiler chicken fed diets with multienzyme complexes

Abstract

ABSTRACT. This study evaluated the effect of multienzyme complexes (EC1 and EC2) in low nutritional density diets on performance and economic viability of broilers. A total of 840 day-old chicks were assigned to 7 treatments, distributed in a completely randomized design: (1) PC: positive control, basal diet formulated to meet nutritional requirements; (2) NC1: negative control, reduced energy and nutrient density diet without enzymes; (3) NC1+EC1; (4) NC2: negative control, diet formulated with 7% over-estimated crude protein and amino acids of soybean meal without enzymes; (5) NC2+EC2; (6) NC3: negative control, reduced energy and nutrient density diet and over-estimation of crude protein and amino acids of soybean meal; (7) NC3+EC1+EC2. Feeding NC1 or NC3 impaired feed conversion ratio at 7, 21 and 42 days, and NC2 at 21 days. Inclusion of EC2 in NC2 diet improved feed conversion ratio and kept it similar to basal diets from 1 to 21 days. Association of EC1 with EC2 in NC3 diet did not improve performance. In summary, inclusion of EC2 in diets with reduced nutrient density keep feed conversion ratio similar to basal diets from 1 to 21 days but does not improve performance of broiler chicken from 1 to 42 days post-hatch.Keywords: exogenous enzymes, poultry, enzyme complexes.Desempenho e viabilidade econômica com utilização de complexos enzimáticos em dietas para frangos de corte RESUMO. Avaliou-se o efeito da inclusão de complexos enzimáticos (CE1 e CE2) em dietas com níveis reduzidos sobre desempenho e viabilidade econômica de frangos. Foram utilizados 840 pintos, distribuídos em delineamento inteiramente casualizado com sete tratamentos e quatro repetições: 1) controle positivo (CP), dieta formulada para atender às exigências nutricionais; 2) controle negativo 1 (CN1), dieta com níveis nutricionais reduzidos; 3) CN1+CE1; 4) CN2: dieta com proteína e aminoácidos do farelo de soja valorizados em 7%; 5) CN2+CE2; 6) CN3: dieta com níveis reduzidos, e farelo de soja valorizado em 7% para proteína e aminoácidos; 7) CN3+CE1+CE2. A conversão alimentar foi maior em aves que receberam dietas CN1 ou CN3 aos sete, 21 e 42 dias, e CN2 aos 21 dias. A inclusão de CE2 na dieta CN2 melhorou a conversão alimentar em relação a CN2, tornando-a semelhante à de aves alimentadas com dieta CP aos 21 dias. A associação de CE1+CE2 na dieta CN3 não favoreceu o desempenho. Portanto, o uso de complexo enzimático (CE2) em dieta com níveis reduzidos mantém a conversão alimentar similar à de aves recebendo dieta-padrão no período de um a 21 dias, porém, no período de um a 42 dias, não melhora o desempenho de frangos.Palavras-chave: enzimas exógenas, aves, complexos multienzimáticos.

Growth performance and carcass yield of broiler chickens in response to carbohydrases and its association with phytase

“…The FCR of the broilers fed PC diets was 6.1 and 6.6% better (P< 0.05), in initial (1-21) and total (1-42) rearing phases, respectively, when The lack of response on performance variables to carbohydrase enzymes has also been reported in other studies (Vieira et al, 2015;Pasquali et al, 2017). Woyengo and Nyachoti (2011) reported that this effect is because of the type and concentration of NSP in feedstuffs vary because of the type and concentration of NSPs, (i.e.…”

Effects of a combination of phytase and multi-carbohydrase enzymes in low-density corn–soybean meal based diets on growth performance and ileal nutrients digestibility of male broilers

“…A simpler and probably more practical application, called 'on top', aimed at improving performance, covering the nutrient variation in ingredients and marginal nutrients in the diet, without adjusting their nutritional levels. Another approach is to formulate diets by reducing nutrients and adding exogenous enzymes in order to restore the nutritional value of the standard diet, seeking the same performance that a diet with usual nutritional levels would provide (Perazzo Costa et al 2008;Pasquali et al 2017). The use of phytase is now a popular practice in broiler diets, and the interaction between dietary phytate and exogenous phytase has been extensively reviewed in broilers (Selle and Ravindran 2007;Selle et al 2012;Liu et al 2015).…”

Performance And Economic Viability Of Broiler Chickens Fed With Probiotic And Organic Acids In An Attempt To Replace Growth-Promoting Antibiotics

“…When evaluating broiler productive performance using enzymatic complexes with nutritional matrices in their diets, Pasquali et al (2017) observed that they did not favor the economic viability of broilers in the period from 1 to 42 days.…”