Efeito De Níveis De Fósforo Não-Fítico E De Fitase Sobre a Tíbia De Frangos De Corte

Abstract

Endereço para correspondência: Maria Cristina de Oliveira -cristina@fesurv.br. R RE ES SU UM MO OAvaliou-se o efeito de níveis de fósforo não-fítico (FNF) e fitase sobre a morfometria e a densidade de tíbia de frangos. Foram utilizadas 1200 aves em delineamento inteiramente casualizado em arranjo fatorial 4 x 3 (níveis de FNF x níveis de fitase), com quatro repetições. Os níveis de FNF, em cada fase, foram 0,45; 0,37; 0,29 e 0,21% na fase inicial; 0,41; 0,33; 0,25 e 0,17% na de crescimento e 0,37; 0,29; 0,21 e 0,13% na final. Os níveis de fitase foram 0, 500 e 1000 UFT/kg de ração. Não houve efeito sobre diâmetro das tíbias aos 21 dias. Tíbias com menor peso, comprimento e densidade de diáfise, epífise distal e média, e densidade de epífise proximal resultaram da redução do FNF de 0,37 para 0,29% e de 0,29 para 0,21%, respectivamente. A inclusão de 500 UFT/kg de ração melhorou o comprimento e a densidade da diáfise das tíbias, independente dos níveis de FNF. Pode-se adotar dieta FNF nas fases inicial, crescimento e final de 0,37, 0,33 e 0,29%, respectivamente, suplementadas com 1000 UFT/kg de ração, de um a 42 dias, sem comprometer a qualidade óssea. Palavras-chave: aditivos, enzimas, qualidade óssea. A AB BS ST TR RA AC CT TIt was evaluated the effect of nonphytate phosphorus (NNP) and phytase on broiler tibia. One thousand and two hundred chicks were allocated in a completely randomized design and factorial arrangement 4 x 3 (NPP x phytase levels), with four replicates. NPP levels, at each phase, were 0.45, 0.37, 0.29 and 0.21% -initial, 0.41, 0.33, 0.25 and 0.17% -growth, and 0.37, 0.29, 0.21 and 0.13% -withdrawal. Phytase levels were 0, 500 and 1000 FTU/kg of diet. There was no effect on diameter at 21 days of age. Tibia with lower weight, length and diaphysis, distal epiphysis and average densities e proximal epiphysis density resulted from NPP reduction from 0.37 to 0.29% and from 0.29 to 0.21%, respectively. Inclusion of 500 FTU/kg of phytase improved length and diaphysis density of the tibia, independent of NPP levels. Diets with NPP, at initial, growth and final phases, of 0.37, 0.33 and 0.29%, respectively, supplemented with 1000 FTU/kg of phytase, can be used with no negative effect on bone quality in broilers.

Tibia Growth and Development in Broiler Chicks Reared under Continuous Light and Melatonin Dietary Supplementation During the First Two Weeks of Life

“…This can have numerous negative consequences, especially in young organisms at a young age, because melatonin is involved in a number of physiological functions. One of these functions is to affect metabolism, growth, and bone development, especially during the fi rst weeks after hatching when these processes are most intense and are critical for tibia development in broiler chickens [1][2][3]. Our results show that the length of the tibia of chickens that received melatonin in the diet was signifi cantly higher than that of chickens that did not receive melatonin.…”

“…Numerous studies have been conducted to explore the characteristics of the dynamics of bone metabolism and the factors that infl uence it. Particular attention has been paid to the growth, development and structure of the tibia in the fi rst weeks after hatching, when these processes are most intense and crucial for the development of the tibia in broilers [1,2].…”