Phytate-phosphorus and phytase contents on the relative weight of organs, intestinal morphometry and performance of broilers/Teores de fosforo fitico e fitase sobre o peso relativo de orgaos, morfometria intestinal e desempenho de frangos de corte
In order to evaluate the efficiency of phytase in diets with low and high phytate phosphorus (PP) content, as a consequence of wheat bran inclusion, on the relative weight of organs, intestinal morphometry and performance, three hundred and eighty-four male Cobb500 broilers were housed in metabolic...
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Published in: | Ciência rural Vol. 46; no. 10; p. 1858 |
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Main Authors: | , , , , , , , |
Format: | Journal Article |
Language: | English |
Published: |
Universidade Federal de Santa Maria
01-10-2016
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Subjects: | |
Online Access: | Get full text |
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Summary: | In order to evaluate the efficiency of phytase in diets with low and high phytate phosphorus (PP) content, as a consequence of wheat bran inclusion, on the relative weight of organs, intestinal morphometry and performance, three hundred and eighty-four male Cobb500 broilers were housed in metabolic cages. Animals were assigned into four treatments in a 2x2 factorial scheme in a randomized block design with eight replicates of 12 birds each. From 11 days of age birds received experimental diets, which consisted of: Diet low in PP; Diet low in PP with phytase (500FTU [kg.sup.-1]); Diet with a high PP and Diet with a high PP with phytase (500FTU [kg.sup.-1]). At 22 and 32 days of age two birds were slaughtered in order to collect gizzard, heart, liver, cecum, cloacal bursa, and at 32 days, a portion of the duodenum, jejunum and ileum was collected for morphometric evaluation. From 22 to 32 days of age average feed intake, average weight gain, average body weight and feed conversion ratio were also evaluated. Data were subjected to analysis of variance, fixed effects of diet and phytase and interaction between factors as well as the random block effects were tested. There was no significant interaction for the variables studied, concluding that phytase in diets with low or high phytate phosphorus content did not change the relative weight of organs, intestinal morphometrics and performance; only isolated effects were observed. Key words: bird, enzyme, substrate, wheat bran. Para avaliar a eficiencia da fitase em dietas com baixo e alto teor de fosforo fitico (PP), em funcao da inclusao ou nao do farelo de trigo, sobre o peso relativo de orgaos, morfometria intestinal e desempenho, foram alojados 384frangos de corte, machos da linhagem Cobb500, em gaiolas metabolicas. Os animais foram distribuidos em quatro tratamentos em um arranjo fatorial 2x2 em delineamento de blocos casualizados com oito repeticoes e 12 aves por unidade experimental (UE). A partir de 11 dias de idade as aves receberam as dietas experimentais, que consistiram em: Dieta com baixo teor de PP; Dieta com baixo teor de PP com fitase (500FTU [kg.sup.-1]); Dieta com alto teor de PP e Dieta com alto teor de PP com fitase (500FTU [kg.sup.-1]). Aos 22 e 32 dias de idade foram abatidas duas aves por UE para coletar a moela, coracao, figado, ceco, bolsa cloacal, e aos 32 dias foi coletada uma porcao do duodeno, jejuno e ileo para avaliacao da morfometria. No periodo de 22 a 32 dias de idade foram avaliados o consumo medio de racao, ganho de peso medio, peso medio corporal e a conversao alimentar. Os dados foram submetidos a analise de variancia, onde foram testados os efeitos fixos de dieta e fitase e a interacao entre os fatores, bem como o efeito aleatorio de bloco. Nao foi observada interacao significativa para nenhuma das variaveis estudadas, concluindo-se que a fitase em dietas com baixo ou alto de PP nao altera o peso relativo dos orgaos, a morfometria intestinal e o desempenho, apenas efeitos isolados foram observados. Palavras-chave: ave, enzima, substrato, farelo de trigo. |
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ISSN: | 0103-8478 |
DOI: | 10.1590/0103-8478cr20150892 |