Exogenous enzymes in pre-starter broiler diets based on corn and soybean meal

A fibrolytic enzyme complex was added to the pre-starter diet. Broiler chicks were randomly distributed into five treatments, consisting of a diet with no enzyme addition and four test diets supplemented with 100, 200, 300 and 400g/T of an enzyme complex. The dietary inclusion of the enzyme complex increased weight gain, and the dose of 300g/T improved weight gain and worsened feed conversion ratio.

Exogenous enzymes in pre-starter broiler diets based on corn and soybean meal

A fibrolytic enzyme complex was added to the pre-starter diet. Broiler chicks were randomly distributed into five treatments, consisting of a diet with no enzyme addition and four test diets supplemented with 100, 200, 300 and 400g/T of an enzyme complex. The dietary inclusion of the enzyme complex increased weight gain, and the dose of 300g/T improved weight gain and worsened feed conversion ratio.(AU)

Exogenous enzymes in pre-starter broiler diets based on corn and soybean meal

A fibrolytic enzyme complex was added to the pre-starter diet. Broiler chicks were randomly distributed into five treatments, consisting of a diet with no enzyme addition and four test diets supplemented with 100, 200, 300 and 400g/T of an enzyme complex. The dietary inclusion of the enzyme complex increased weight gain, and the dose of 300g/T improved weight gain and worsened feed conversion ratio.

Enzimas exógenas em dietas com Saccharomyces cerevisiae íntegra para frangos de corte

A levedura da cana-de-açúcar (Saccharomyces cerevisiae) é um alimento proteico, no entanto, sua rígida parede celular dificulta o aproveitamento dos nutrientes pelos animais não ruminantes, sendo necessário estratégias que viabilizem o uso desta em maiores quantidades nas dietas. As enzimas exógenas apresentam potencial para utilização em dietas com levedura, principalmente aquelas que possuem substrato específico na parede celular da mesma. Objetivou-se com este trabalho avaliar o efeito da inclusão do complexo enzimático (CE), em dietas com levedura de cana-de-açúcar sobre o desempenho zootécnico, rendimento de carcaça, histomorfometria intestinal e viabilidade econômica das dietas de frangos de corte em dois períodos de criação (1 a 21 e 22 a 42 dias de idade). Utilizou-se o delineamento inteiramente casualizado em esquema fatorial 2x3+1, sendo dois níveis de complexo enzimático, (0 e 200g/ton), três níveis de inclusão de levedura (0%, 6% e 12%) e uma dieta controle, com sete tratamentos, cinco repetições e 20 aves por unidade experimental. Foram avaliados as variáveis de desempenho (consumo de ração, ganho de peso e conversão alimentar), rendimento de carcaça, histomorfometria do intestino delgado (altura, perímetro e largura de vilo, altura e largura de cripta, espessura da camada muscular intestinal e relação vilo/cripta) e viabilidade econômica das dietas. Na fase de 1 a 7 dias houve aumento (p<0,05) no consumo de ração e conversão alimentar nas dietas com inclusão de levedura, demostrando efeito linear crescente. Todavia, no período de 1 a 21 dias de idade houve queda no desempenho dos animais que receberam levedura na ração, porém, não foi observado efeito significativo do complexo enzimático. Aos 21 dias observou-se aumento (p<0,05) da parede muscular intestinal no duodeno, e redução na largura da cripta no íleo com a utilização do CE. No nível de 12% de levedura sem o CE, observou-se maior espessura da parede muscular intestinal do jejuno quando comparada ao tratamento controle positivo. Na fase de 22 a 33 dias, o uso de 6% de levedura proporcionou maior consumo de ração e ganho de peso, já no período de 22 a 42 dias não houve efeito significativo para o desempenho, considerando os níveis crescentes da levedura. Nas fases de 22 a 33 e 22 a 42 dias, não foi observado efeito do complexo enzimático sobre as variáveis de desempenho animal. Não houve efeito significativo (p>0,05) para os valores relativo de rendimento de carcaça e cortes aos 21 e 42 dias com o uso de levedura, suplementada ou não com o complexo enzimático. Aos 42 dias observou-se que houve interação entre os fatores para largura e profundidade de cripta no duodeno e jejuno respectivamente. A inclusão de levedura aumentou o custo médio das rações nos períodos de 1 a 21 e 22 a 42 dias. Pode-se concluir que, a inclusão de levedura em dietas para frangos de corte de 1 a 21 dias compromete o desempenho dos animais. O uso da levedura e do complexo enzimático não influencia no rendimento de carcaça aos 21 e 42 dias. A adição do complexo enzimático beneficia a mucosa do íleo de 1 a 21 dias. A utilização da levedura e complexo enzimático de 22 a 42 dias não compromete o desempenho. O uso de levedura não é economicamente viável nos níveis de 6 e 12% nos dois períodos de criação.

Sugarcane yeast (Saccharomyces cerevisiae) is a protein food; however, its stiff The cell wall makes it difficult for nutrients to be utilized by non-ruminant animals. Strategies that allow the use of this in greater amounts in the diets. Exogenous enzymes Potential in diets with yeast, especially those with specific Cell wall of the same. The objective of this work was to evaluate the effect of the inclusion of the enzymatic complex (EC), in diets with sugarcane yeast on performance, carcass yield, Intestinal histomorphometry and economic viability of broiler diets in two breeding periods (1 to 21 and 22 to 42 days of age). A completely randomized design was used in a factorial scheme (0 and 200 g / ton), three levels of yeast inclusion (0%, 6% And 12%) and a control diet, with seven treatments, five replicates and 20 birds per experimental unit. The performance variables (feed intake, weight gain and feed conversion) were evaluated, Carcass yield, histomorphometry of the small intestine (height, perimeter and villus width, height and Crypt width, intestinal muscle layer thickness and villus / crypt relationship) and economic viability of Diets. In the 1 to 7 days period there was an increase (p <0.05) in feed intake and feed conversion in diets With yeast inclusion, showing increasing linear effect. However, in the period from 1 to 21 days of age There was a decrease in the performance of the animals that received yeast in the diet, but no effect Of the enzyme complex. At 21 days there was an increase (p <0.05) in the intestinal muscular wall In the duodenum, and reduction in crypt width in the ileum with EC use. At the level of 12% yeast without EC, a greater thickness of the jejunum intestinal muscular wall was observed when compared to the treatment Positive control. In the 22 to 33 days phase, the use of 6% of yeast provided higher feed intake and Weight gain, in the period from 22 to 42 days there was no significant effect on performance, considering Increasing levels of yeast. In the phases of 22 to 33 and 22 to 42 days, no effect of the complex Enzymatic activity on animal performance variables. There was no significant effect (p> 0.05) for the Of carcass yield and cuts at 21 and 42 days with the use of yeast supplemented or not with The enzymatic complex. At 42 days it was observed that there was interaction between the factors for width and Depth of crypt in the duodenum and jejunum respectively. The inclusion of yeast increased the average cost Of rations in the periods of 1 to 21 and 22 to 42 days. It can be concluded that the inclusion of yeast in diets for Broilers from 1 to 21 days compromises the performance of the animals. The use of yeast and Did not influence carcass yield at 21 and 42 days. The addition of the enzyme complex It benefits the lining of the ileum from 1 to 21 days. The use of yeast and enzyme complex for 22 to 42 days did not Compromises performance. The use of yeast is not economically feasible at the levels of 6 and 12% in the two Periods of creation.