Resumo O estudo avaliou o efeito de diferentes doses de fitase e duas dietas (milho e farelo de soja, e farinha de carne e ossos) no desempenho de frangos de corte e na digestibilidade de nutrientes das rações. Foram utilizados 1320 frangos de corte Cobb 500 para o experimento de desempenho, 216 frangos de corte Cobb 500 para o ensaio de metabolismo, e 252 pintos de corte para a determinação dos coeficientes de digestibilidade aparentes e estandardizados dos aminoácidos das dietas. As aves foram pesadas individualmente e distribuídos em delineamento inteiramente casualizado, totalizando seis tratamentos divididos em esquema fatorial 2x3 (duas dietas e três níveis de fitase compondo os tratamentos): dietas vegetais com 500, 1000 e 1500 FTU de fitase (T1, T2, T3); e dietas com farinha de carne e ossos com 500, 1000 e 1500 FTU de fitase (T4, T5, T6). O ganho de peso médio final e ganho de peso dos animais que consumiram dietas com farinha de carne e ossos e fitase a 500 FTU/kg foi similar com os que consumiram 1000 FTU/kg de fitase. E a digestibilidade dos aminoácidos para os animais que consumiram dietas com milho e farelo de soja e fitase com 500 FTU/kg foi similar com os que consumiram 1000 FTU/kg, e estatisticamente o nível de 1500 FTU/kg foi igual ao nível de 500 FTU/ kg. Altas doses de fitase não promoveram melhora no desempenho e digestibilidade dos nutrientes, bem como nos valores de EMAn, com isso, recomenda-se a suplementação de fitase a 500 FTU/kg. rações 132 50 21 metabolismo 25 casualizado x 2x tratamentos) 100 150 T1, T1 T (T1 T2 T3 T3) T4, T4 (T4 T5 T6. T6 . T6) FTUkg kg EMAn isso recomendase recomenda se 13 5 2 10 15 (T 1

Abstract The study evaluated the effect of different doses of phytase and two diets (corn and soybean meal, and meat and bone meal) on the performance of broiler chickens and the digestibility of nutrients in feed. A total of 1320 Cobb 500 broilers were used for the performance experiment, 216 Cobb 500 broilers for the metabolism test, and 252 broiler chicks to determine the apparent and standardized digestibility coefficients of amino acids in the diets. The birds were individually weighed and distributed in a completely randomized design, comprising six treatments divided into a 2×3 factorial scheme (two diets and three levels of phytase composing the treatments): vegetable diets with 500, 1000, and 1500 FTU of phytase (T1, T2, T3); and meat and bone meal diets with 500, 1000, and 1500 FTU of phytase (T4, T5, T6). The average final weight gain and weight gain of animals that consumed diets with meat and bone meal and phytase at 500 FTU/kg were similar to those that consumed 1000 FTU/kg of phytase. The digestibility of amino acids for animals that consumed diets with corn and soybean meal and phytase at 500 FTU/kg was similar to those that consumed 1000 FTU/kg; statistically, the level of 1500 FTU/kg was equal to that of 500 FTU/kg. High doses of phytase did not promote improvements in performance and nutrient digestibility, as well as EMAn values; therefore, phytase supplementation at 500 FTU/kg is recommended. feed 132 50 experiment 21 test 25 design 23 2 3 2× treatments) 150 T1, T1 T (T1 T2 T3 T3) T4, T4 (T4 T5 T6. T6 . T6) FTUkg kg 100 statistically values therefore recommended 13 5 15 (T 10 1

Abstract This study assessed the effect of different periods of post-hatch fasting on animal performance and breast and digestive system growth in European quail. Quail chicks were distributed in a completely randomized design, with four fasting periods (0, 24, 36, and 48 hs) and four replications of 40 birds per treatment. In 1 to 14-day-old chicks, weight gain decreased with increasing fasting time. Compensatory gain was observed from 15 days of age onward. Fasted quail had a lower length and relative weight of the digestive system than fed animals for up to 14 days. Histologically, the duodenal villus height was significantly lower in 3-day-old quail fasted for 36 hs than in those fasted for 48 hs, but this effect was not observed at 7 days. Scanning electron microscopy showed no differences in the small intestinal mucosa between fasted and fed birds at 3 days of age. Post-hatch fasting reduced the relative weight of the breast in quail aged 1 to 14 days but did not affect type IIa and IIb fiber diameter at 35 days. On the basis of these results, it is recommended that European quail raised for meat should not be fasted for more than 48 hs post-hatch. posthatch post hatch design 0, 0 (0 24 4 treatment 14dayold dayold day old time onward Histologically 3dayold Posthatch Post results posthatch. hatch. ( 2

Objetivou-se com este estudo avaliar o efeito da redução de nutrientes e energia suplementada ou não com fitase para frango de corte na fase 14 a 24 dias de idade no consumo, excreção e balanço de nitrogênio, de cálcio e de fósforo. Foram distribuídos 392 frangos de corte em delineamento inteiramente casualizado, utilizando-se arranjo fatorial 3 x 2 + 1 que consistiram de nível reduzido de cálcio e fósforo; níveis reduzidos de aminoácidos e energia; níveis reduzidos cálcio, fósforo, aminoácidos e energia x com e sem enzima + controle positivo, totalizando sete tratamentos com oito repetições de sete aves por unidade experimental. Nas dietas com fitase utilizou-se 500 FTU de fitase/kg de ração. Os dados foram submetidos à análise de variância e as médias comparadas por contrastes ortogonais através do teste F. Os resultados demonstram que a enzima fitase utilizada permitiu diminuir a quantidade de nutriente e energia das rações, proporcionando redução de 21,34% na excreção de cálcio e balanço de cálcio de 20,16%. Similarmente, reduções das quantidades de excreção de nitrogênio em 7,56% e fósforo em 21,34%, diminuindo a excreção desses nutrientes e aumentando o balanço de nitrogênio e fósforo em 9,41 e 33,94% em média, respectivamente.

Theobjective of thisstudywas to evaluatethe effect ofreducedcalcium, phosphorus, energy andamino aciddietsupplemented withphytase forbroilersin the growth phase(14 to28 days)on the ofnitrogen, calciumand phosphorus balance. We distributed392male broilersofCobb, in a completely randomizedin a factorial3 x2 + 1Reduced levelofCaandP; Reduced levels ofamino acidsand energylevelsreducedCa, P, andamino acids x with and withoutenzyme+positive control), seven treatmentswitheight replicatesof sevenchicks each. In the diets with phytasewas used 500 FTU of phytase/ kg diet.Data weresubmitted to varianceanalysisandaverages werecomparedby theF test fororthogonal contrasts. Through the results can be seen that the enzyme phytase used thus of 21,34% reduction in calcium excretion end apparent retention ratio of calcium to 20,16%. Similarly, reductions of nitrogen excretion by 7,56% and phosphorus excretion by 21,34%, the environmental impact reducing caused by the excretion of these nutrientes of these nutrientes and increasing the apparent retention ratio of 9,41 and 33,94% in average, respectively.