Effects of dietary xylanase plus ß-glucanase levels on total-tract nutrient and energy digestibility and N balance of growing pigs fed diets containing corn distillers dried grains.

The addition of corn distillers dried grains (corn-DDG) to pig diets has been limited due to concerns about fiber content. The aim of the present study was to determine the metabolizable energy of corn-DDG (Exp. I) and the dose-response effects of dietary xylanase plus ß-glucanase on the nutrient and energy digestibility of growing pigs fed diets containing 25% corn-DDG (Exp. II). Pigs in individual cages were subjected to feeding periods of 5 days for voluntary feed intake quantification followed by 5 days for collection of feces and urine. In Exp. I, 10 castrated male pigs with 61.10 ± 3.25 kg BW distributed in a randomized complete block design experiment with five replications were fed a reference diet or a test diet (75% reference diet plus 25% corn-DDG). In Exp. II, 10 castrated male pigs with 29.69 ± 3.57 kg BW distributed in a Latin square design (two squares with four replicates in time) experiment were fed with 5 dietary xylanase plus ß-glucanase levels (0, 50, 100, 200, or 400 mg/kg) added to diets formulated with 25% corn-DDG. The corn-DDG had 26.5% crude protein, 5.94% ether extract, 55.5% neutral detergent fiber (NDF), and 4.248 kcal/kg gross energy. The metabolizable energy of corn-DDG was 3.657 ± 189 kcal/kg. Increasing dietary xylanase plus ß-glucanase quadratically influenced (P < 0.05) the NDF digestibility and digestible energy in growing pigs fed diets containing 25% corn-DDGS. Compared to the control, dietary xylanase plus ß-glucanase addition increased digestibility and reduced metabolizability of crude protein. The addition of dietary xylanase plus ß-glucanase to growing pig diets containing corn-DDG increased NDF digestibility, allowing for additional dietary energy and protein availability.

Digestive α-L-fucosidase activity in Rhodnius prolixus after blood feeding: effect of secretagogue and nutritional stimuli.

Introduction: Rhodnius prolixus (Hemiptera: Reduviidae) is an important vector of Trypanosoma cruzi, the causative agent of Chagas Disease. This insect is a model for the study of insect physiology, especially concerning the digestion of blood. Among the enzymes produced in the midgut of R. prolixus after blood feeding there is a α-L-fucosidase activity. There are very few studies on α-L-fucosidase of insects, and the role of R. prolixus α-L-fucosidase is still not clear. In this work, we tested if the mechanism for production of this enzyme is similar to the observed for proteases, a secretatogue mechanism that respond to the protein contents of the meal. Methods: We tested if specific proteins or sugars elicit this response, which may help to understand the nature of the physiological substrate for this enzyme. Results: In general, our results showed that the Anterior Midgut was the only midgut fraction that responds to the blood meal in terms of α-L-fucosidase production. Besides that, this response was not triggered by midgut distension or by ingestion of the blood cell fraction. Conversely, the enzyme was produced after feeding with the plasma fraction. However, the production of α-L-fucosidase was also triggered by different biochemical stimuli, as protein or fucoidan ingestion. Discussion: This suggested that the production of the enzyme in the anterior midgut was a general physiological response under control of different convergent signals. Besides that, the comparison between different treatments for artificial blood feeding showed that heparinated blood was the choice with minor side effects for the study of the midgut α-L-fucosidase, when compared to defibrinated or citrated blood.

The Effects of Yucca Schidigera Extract and Multi-carbohydrase in Different Crude Protein Diets on Growth Performance, Nutrient Digestibility, Carcass Parameters and Excreta Noxious Gas Contents in Broilers

The scarcity and increase in the price of animal feeds have attracted the attention of nutritionists to address this issue. The inclusion of plant extracts and enzymes to protein-reduced diet could be a feasible strategy to reducing the feed cost. Therefore, the purpose of this study was to assess the impacts of Yucca schidigera extract and multi-carbohydrase in low crude protein (CP) diets of broiler on growth performance, nutrient digestibility, carcass metrics, and noxious gas levels in the excreta. A total of 480, 1-d-old ROSS 308 were randomly allocated into 4 dietary treatments, six replication, and 20 birds/cage. Phase 1, T1(CP 21%, ME 2,969 kcal/kg); T2 (CP 19%, ME 2,863 kcal/kg + 0.02% Yucca); T3 (CP 17%, ME 2,865 kcal/kg + 0.02% Yucca); T4 (CP 17%, ME 2,861 kcal/kg + 0.02% Yucca + 0.1% multi-carbohydrase). Phase 2, T1 (CP 19%, ME 3,086 kcal/kg); T2 (CP 17%, ME 2,977 kcal/kg + 0.02% Yucca); T3 (CP 15%, ME 2,978 kcal/kg + 0.02% Yucca); T4 (CP 15%, ME 2,978 kcal/kg + 0.02% Yucca + 0.1% 0.1% multi-carbohydrase). Although the addition of YS and multi-carbohydrase to the low CP diets on the growth performance did not improve, it revealed the positive result on the nutrient digestibility, carcass parameters, and noxious gas emission. Overall, broilers supplemented with YS 0.02% and multi-carbohydrase (0.1%) demonstrated the best production performances compared to the other treatment groups. Thus, a combination of YS and multi-carbohydrase could be added to the diets with low CP to boost broiler production performance.(AU)

Enzymatic pretreatment in the extraction process of soybean to improve protein and isoflavone recovery and to favor aglycone formation.

This research aimed to evaluate the pretreatment of soybean with the carbohydrase multi-enzyme complex "Viscozyme L", during the extraction process; in order to improve the recovery of proteins and isoflavones in soybase, and reduce the loss of these compounds through the okara residue. Three concentrations of enzyme were studied at 50 °C, along with an experiment carried out without enzyme addition (control experiment). The results were also evaluated in relation to standard soybase processing. In comparison to the standard and control processes, the enzymatic pretreatment reduced up to 85% the total amount of okara residue. Due to the action of the multi-enzyme complex, protein and total isoflavone recovery increased from 42% to 83% and from 59% to 93%, respectively. The application of Viscozyme L also favored the conversion of conjugated forms of isoflavone to aglycone in the soybase, representing up to 50% of the total isoflavones. The enzymatic pretreatment of soybean with carbohydrase improved the nutritional quality of the soybase, while at the same time reducing residue generation; showing that the proposed food process can be considered environmentally friendly method.

The Effects of Sodium Chloride versus Sodium Bicarbonate at the Same Dietary Sodium Concentration on Efficacy of Dietary Phytase and a Carbohydrase-Protease Cocktail in Broilers

A trial was conducted to determine the effect of phytase (PHY) or a carbohydrase/protease cocktail (CPX) on broilers fed diets with two different levels of chloride (0.28% or 0.43%) created by altering dietary salt (NaCl) and sodium bicarbonate (NaHCO3). There were 6 combination dietary treatments (3 enzyme x 2 NaCl treatments) applied to 4 replicate pens. The treatments were as follows: Control diet (CON), CON+PHY and CON+CPX, with 0.5% or 0.25% NaCl. The 0.25% NaCl versions contained 0.35% sodium bicarbonate. The 0.5% salt versions had no sodium bicarbonate. Replicate pen BW, and feed consumption (FC) were measured at 1, 14, and 35 d, and mortality was weighed daily for feed conversion ratio (FCR) calculations. Feed consumption at 14 d tended to be lower (p 0.10) for CON+CPX diets compared to CON and CON+PHY diets. The birds fed CON+CPX diet consumed less feed but exhibited improved FCR in the presence of 0.5% NaCl at 14 d. The birds fed the CON, and CON+PHY diets exhibited higher BW at 14 d (p 0.05) and 35 d (p 0.01) of age than did CON+CPX birds. From 15 d to 35 d, birds fed the CON+CPX diet exhibited poorer BW gain (BWG) in the presence of 0.25% NaCl (p 0.05). In conclusion, Cl, as NaCl versus NaH2CO3, could affect CPX but not PHY feed enzyme function in broilers. Further, it may be suggested that certain feed enzymes may be best utilized at later broiler ages rather than in initial feeds.

The Effects of Sodium Chloride versus Sodium Bicarbonate at the Same Dietary Sodium Concentration on Efficacy of Dietary Phytase and a Carbohydrase-Protease Cocktail in Broilers

A trial was conducted to determine the effect of phytase (PHY) or a carbohydrase/protease cocktail (CPX) on broilers fed diets with two different levels of chloride (0.28% or 0.43%) created by altering dietary salt (NaCl) and sodium bicarbonate (NaHCO3). There were 6 combination dietary treatments (3 enzyme x 2 NaCl treatments) applied to 4 replicate pens. The treatments were as follows: Control diet (CON), CON+PHY and CON+CPX, with 0.5% or 0.25% NaCl. The 0.25% NaCl versions contained 0.35% sodium bicarbonate. The 0.5% salt versions had no sodium bicarbonate. Replicate pen BW, and feed consumption (FC) were measured at 1, 14, and 35 d, and mortality was weighed daily for feed conversion ratio (FCR) calculations. Feed consumption at 14 d tended to be lower (p 0.10) for CON+CPX diets compared to CON and CON+PHY diets. The birds fed CON+CPX diet consumed less feed but exhibited improved FCR in the presence of 0.5% NaCl at 14 d. The birds fed the CON, and CON+PHY diets exhibited higher BW at 14 d (p 0.05) and 35 d (p 0.01) of age than did CON+CPX birds. From 15 d to 35 d, birds fed the CON+CPX diet exhibited poorer BW gain (BWG) in the presence of 0.25% NaCl (p 0.05). In conclusion, Cl, as NaCl versus NaH2CO3, could affect CPX but not PHY feed enzyme function in broilers. Further, it may be suggested that certain feed enzymes may be best utilized at later broiler ages rather than in initial feeds.(AU)

Use of exogenous enzymes in diets for juvenile pompano Trachinotus marginatus: growth and liver and intestine morphophysiology / Uso de enzimas exógenas em dietas para juvenis de pampo Trachinotus marginatus: crescimento e morfofiologia do fígado e intestino

This study investigated the use of exogenous enzymes in diets of juvenile pompano Trachinotus marginatus. Six diets (43% protein, 8% lipid), containing 0 (TC), 25 (T25), 50 (T50), 100 (T100), 250 (T250), and 500 (T500) mg kg-1 of multiple enzymes Rovabio® MAX AP were produced. The effects on growth performance, body composition, liver glycogen, triglyceride levels, and intestinal and hepatic morphological alterations were assessed. The results showed significant differences (p < 0.05) in growth performance among fish fed diets T100, T250, and T500, with high liver triglyceride accumulation and changes in morphology in the fish fed diets T250 and T500. The calcium concentration in the bones showed a significant difference (P < 0.05) only in fish fed diets T50, T100, and T250 in relation to control. However, there were no significant differences in body composition, intestinal morphology, or liver glycogen concentration. These results suggest that 100 mg enzyme per kg diet was the optimal level of inclusion for juvenile pompano, favoring improved growth performance and calcium concentration in the bones without significant effects on liver triglyceride levels.(AU)

Este estudo investigou o uso de enzimas exógenas em dietas para juvenis de pampo prateado Trachinotus marginatus. Foram preparadas seis dietas (43% de proteína, 8% de lipídio), contendo 0 (TC), 25 (T25), 50 (T50), 100 (T100), 250 (T250) e 500 (T500) mg kg-1 do complexo enzimático Rovabio® Max AP. Avaliou-se os efeitos sobre o crescimento, composição de carcaça, níveis de glicogênio e triglicerídeo no fígado e possíveis alterações na morfologia do intestino e fígado. Os resultados mostraram diferença significativa (p < 0,05) no desempenho de crescimento dos peixes dos tratamentos T100, T250 e T500, com grande concentração de triglicerídeos e alteração na morfologia do fígado nos peixes dos tratamentos T250 e T500. A concentração de cálcio nos ossos também teve um aumento significativo (p < 0,05) nos peixes dos tratamentos T50, T100 e T250 em relação ao controle. Entretanto, não houve diferença significativa (p > 0,05) na composição de carcaça, morfologia do intestino e concentração de glicogênio no fígado. Esses resultados indicam que o uso de 100 mg kg-1 de enzimas na dieta mostrou ser o melhor nível de inclusão para juvenis de pampo prateado, favorecendo o crescimento e a concentração de cálcio nos ossos. Sem efeitos significativos sobre os níveis de triglicerídeos no fígado.(AU)

Use of exogenous enzymes in diets for juvenile pompano Trachinotus marginatus: growth and liver and intestine morphophysiology / Uso de enzimas exógenas em dietas para juvenis de pampo Trachinotus marginatus: crescimento e morfofiologia do fígado e intestino

This study investigated the use of exogenous enzymes in diets of juvenile pompano Trachinotus marginatus. Six diets (43% protein, 8% lipid), containing 0 (TC), 25 (T25), 50 (T50), 100 (T100), 250 (T250), and 500 (T500) mg kg-1 of multiple enzymes Rovabio® MAX AP were produced. The effects on growth performance, body composition, liver glycogen, triglyceride levels, and intestinal and hepatic morphological alterations were assessed. The results showed significant differences (p < 0.05) in growth performance among fish fed diets T100, T250, and T500, with high liver triglyceride accumulation and changes in morphology in the fish fed diets T250 and T500. The calcium concentration in the bones showed a significant difference (P < 0.05) only in fish fed diets T50, T100, and T250 in relation to control. However, there were no significant differences in body composition, intestinal morphology, or liver glycogen concentration. These results suggest that 100 mg enzyme per kg diet was the optimal level of inclusion for juvenile pompano, favoring improved growth performance and calcium concentration in the bones without significant effects on liver triglyceride levels.

Este estudo investigou o uso de enzimas exógenas em dietas para juvenis de pampo prateado Trachinotus marginatus. Foram preparadas seis dietas (43% de proteína, 8% de lipídio), contendo 0 (TC), 25 (T25), 50 (T50), 100 (T100), 250 (T250) e 500 (T500) mg kg-1 do complexo enzimático Rovabio® Max AP. Avaliou-se os efeitos sobre o crescimento, composição de carcaça, níveis de glicogênio e triglicerídeo no fígado e possíveis alterações na morfologia do intestino e fígado. Os resultados mostraram diferença significativa (p 0,05) na composição de carcaça, morfologia do intestino e concentração de glicogênio no fígado. Esses resultados indicam que o uso de 100 mg kg-1 de enzimas na dieta mostrou ser o melhor nível de inclusão para juvenis de pampo prateado, favorecendo o crescimento e a concentração de cálcio nos ossos. Sem efeitos significativos sobre os níveis de triglicerídeos no fígado.

First characterization of fucosidases in spiders.

l-fucose is a constituent of glycoconjugates in different organisms. Fucosidases catalyze the removal of fucose residues, and have been correlated to different physiological and pathological processes, such as fertilization, cancer, fucosidosis, and digestion in molluscs and ticks. An α-l-fucosidase sequence was identified from the transcriptome and proteome from the midgut diverticula of the synanthropic spider Nephilingis cruentata. In this article, we describe the isolation of this α-l-fucosidase and the characterization of its activity using substrates and inhibitors demonstrating different specificities among fucosidases. The enzyme had a Km of 32 and 400 µM for 4-methylumbelliferyl α-l-fucopyranoside and 4-nitrophenyl α-l-fucopyranoside, respectively; and was unable to hydrolyze fucoidan. Nephilingis cruentata α-l-fucosidase was inhibited competitively by fucose and fuconojyrimycin. The fucosidase had two distinct pH optima even in the isolated form, due to oligomerization dependent on pH, as previously described to other fucosidases. Alignment and molecular homology modeling of the protein sequence with other fucosidases indicated that the active sites and catalytic residues were different, including residues involved in acid/base catalysis. Phylogenetic analysis showed, for the first time, gene-duplication events for fucosidases in Arachnida species. All these data reveal that studies on fucosidases in organisms distinct from bacteria, fungi, and humans are important.

First characterization of fucosidases in spiders

l-fucose is a constituent of glycoconjugates in different organisms. Fucosidases catalyze the removal of fucose residues, and have been correlated to different physiological and pathological processes, such as fertilization, cancer, fucosidosis, and digestion in molluscs and ticks. An alpha-L-fucosidase sequence was identified from the transcriptome and proteome from the midgut diverticula of the synanthropic spider Nephilingis cruentata. In this article, we describe the isolation of this alpha-L-fucosidase and the characterization of its activity using substrates and inhibitors demonstrating different specificities among fucosidases. The enzyme had a K-m of 32 and 400 mu M for 4-methylumbelliferyl alpha-L-fucopyranoside and 4-nitrophenyl alpha-L-fucopyranoside, respectively; and was unable to hydrolyze fucoidan. Nephilingis cruentata alpha-L-fucosidase was inhibited competitively by fucose and fuconojyrimycin. The fucosidase had two distinct pH optima even in the isolated form, due to oligomerization dependent on pH, as previously described to other fucosidases. Alignment and molecular homology modeling of the protein sequence with other fucosidases indicated that the active sites and catalytic residues were different, including residues involved in acid/base catalysis. Phylogenetic analysis showed, for the first time, gene-duplication events for fucosidases in Arachnida species. All these data reveal that studies on fucosidases in organisms distinct from bacteria, fungi, and humans are important.

Exogenous enzyme complex prevents intestinal soybean meal-induced enteritis in Mugil liza (Valenciennes, 1836) juvenile

ABSTRACT Four soybean meal-based diets containing increasing levels of an enzyme complex (E50, E100, E150 and E200 at 50, 100, 150 and 200 g ton-1, respectively) and one soybean meal-based diet without the enzyme complex (E0) were fed in triplicate to M. liza juveniles in a semi-static flow system with 20 fish per tank for 75 days. There were no differences between the treatments for animal performance parameters, but fish fed the enzyme complex treatment exhibited significantly (P<0.05) higher values of calcium bone retention compared with control fish. Although there was no relationship between bacterial counts in different sections of the gastrointestinal tract or enzyme levels, filamentous bacteria were increased in E50 compared with E150. All of the treatments resulted in higher bacterial counts in the stomach than in intestinal segments. Histological screening showed serious to moderate infiltration of inflammatory cells, modification in villus morphology and necrosis in some cases in fish fed the E0 diet. In addition, fish from the E0 treatment exhibited significantly (P<0.05) lower lipid deposition in the peritoneal cavity. Therefore, the use of low levels of exogenous enzyme is recommended in diets for M. liza when soybean meal is used as the main source of protein.

Effect of using the Matrix Values for NSP-degrading enzymes on performance, water intake, litter moisture and jejunal digesta viscosity of broilers fed barley-based diet / Efeito do uso de valores de tabela para enzimas degradadoras de PNA sobre o desempenho, ingestão de água, umidade da cama e viscosidade da digesta jejunal de frangos de corte alimentados com dieta à base de cevada

In this study, we have evaluated the effect of three multi-enzymes nutrient matrix values and compared the results with that fed barley and the corn diets without enzyme. In entire period, addition of all enzymes to the barley-based diet significantly (p 0.05) increased feed intake (FI) and the highest intake was for birds that fed enzyme A (p 0.05). Overall, from 0 to 42 days, average daily gain (ADG) was significantly (p 0.05) increased by enzyme and birds fed enzyme A had the highest body weight (p 0.05). Generally, from 0 to 42 d of age, feed conversion ratio (FCR) was significantly (p 0.05) improved when enzyme added to barley-based diet, but there were no significant differences among diets containing enzymes A and C and the corn-based diet. The carcass weight, and the relative weight of the abdominal fat were significantly increased by enzyme, while small intestine and cecum decreased with enzyme addition (p 0.05). Enzyme significantly decreased jejunal viscosity at Day 23 (p 0.05), whereas pH of jejunal digesta was not changed (p > 0.05). Litter moisture and water to feed ratio at 15, 25, and 33 days of age significantly decreased by addition of all enzymes (p 0.05). In conclusion, considering nutrient matrix values for all used enzymes improved performance of broilers and can be used in formulating diets commercial broiler die(AU)

Este estudo avaliou o efeito de três valores da matriz para nutriente multi-enzimático e comparou os resultados com os obtidos com dietas baseadas em cevada e milho sem enzima. Em todo o período, a adição de todas as enzimas à dieta à base de cevada aumentou significativamente (p 0,05) a ingestão de ração, sendo a maior ingestão observada nas aves alimentadas com a enzima A (p 0,05). No geral, de 0 a 42 dias, o ganho médio diário foi significativamente aumentado (p 0,05) pelo uso de enzimas e as aves alimentadas com a enzima A apresentaram o maior peso corporal (p 0,05). De modo geral, de 0 a 42 dias de idade, o índice de conversão alimentar foi significativamente maior (p 0,05) com a adição de enzima à dieta a base de cevada, mas sem diferenças significativas entre as dietas contendo enzimas A e C e à dieta a base de milho. O peso da carcaça e o peso relativo da gordura abdominal foram significativamente aumentados pela enzima, enquanto o intestino delgado e o ceco diminuíram com a adição de enzima (p 0,05). A adição de enzima reduziu significativamente a viscosidade do jejuno no dia 23 (p 0,05), ao passo que o pH da digesta jejunal não foi alterado (p > 0,05). A umidade da cama e a razão água: ração aos 15, 25 e 33 dias de idade foram significativamente reduzidos pela adição de todas as enzimas (p<0,05).(AU)

Effect of using the Matrix Values for NSP-degrading enzymes on performance, water intake, litter moisture and jejunal digesta viscosity of broilers fed barley-based diet / Efeito do uso de valores de tabela para enzimas degradadoras de PNA sobre o desempenho, ingestão de água, umidade da cama e viscosidade da digesta jejunal de frangos de corte alimentados com dieta à base de cevada

In this study, we have evaluated the effect of three multi-enzymes nutrient matrix values and compared the results with that fed barley and the corn diets without enzyme. In entire period, addition of all enzymes to the barley-based diet significantly (p 0.05) increased feed intake (FI) and the highest intake was for birds that fed enzyme A (p 0.05). Overall, from 0 to 42 days, average daily gain (ADG) was significantly (p 0.05) increased by enzyme and birds fed enzyme A had the highest body weight (p 0.05). Generally, from 0 to 42 d of age, feed conversion ratio (FCR) was significantly (p 0.05) improved when enzyme added to barley-based diet, but there were no significant differences among diets containing enzymes A and C and the corn-based diet. The carcass weight, and the relative weight of the abdominal fat were significantly increased by enzyme, while small intestine and cecum decreased with enzyme addition (p 0.05). Enzyme significantly decreased jejunal viscosity at Day 23 (p 0.05), whereas pH of jejunal digesta was not changed (p > 0.05). Litter moisture and water to feed ratio at 15, 25, and 33 days of age significantly decreased by addition of all enzymes (p 0.05). In conclusion, considering nutrient matrix values for all used enzymes improved performance of broilers and can be used in formulating diets commercial broiler die

Este estudo avaliou o efeito de três valores da matriz para nutriente multi-enzimático e comparou os resultados com os obtidos com dietas baseadas em cevada e milho sem enzima. Em todo o período, a adição de todas as enzimas à dieta à base de cevada aumentou significativamente (p 0,05) a ingestão de ração, sendo a maior ingestão observada nas aves alimentadas com a enzima A (p 0,05). No geral, de 0 a 42 dias, o ganho médio diário foi significativamente aumentado (p 0,05) pelo uso de enzimas e as aves alimentadas com a enzima A apresentaram o maior peso corporal (p 0,05). De modo geral, de 0 a 42 dias de idade, o índice de conversão alimentar foi significativamente maior (p 0,05) com a adição de enzima à dieta a base de cevada, mas sem diferenças significativas entre as dietas contendo enzimas A e C e à dieta a base de milho. O peso da carcaça e o peso relativo da gordura abdominal foram significativamente aumentados pela enzima, enquanto o intestino delgado e o ceco diminuíram com a adição de enzima (p 0,05). A adição de enzima reduziu significativamente a viscosidade do jejuno no dia 23 (p 0,05), ao passo que o pH da digesta jejunal não foi alterado (p > 0,05). A umidade da cama e a razão água: ração aos 15, 25 e 33 dias de idade foram significativamente reduzidos pela adição de todas as enzimas (p<0,05).

Enzymatic programs for broilers

Two trials were conducted on floor pens to evaluate the performance of broilers fed with diets contained different carbohydrases enzyme programs at different ages. Trial 1- The body weight gain (BWG) was affected by the Negative Control (NC) treatment (P<0.05). However, when the birds were fed with the NC diet + Amilase (AMY)+Xilanase (XYL), the BWG improved and reached the same level as the Positive Control (PC). Trial 2- The birds received enzymes supplementation in the total phase and others only in the grower phase.The ME reduction by 120 kcal/kg increased the feed conversion ratio (FCR) (P<0.05) when compared to PC and none of the enzyme programs was able to recover the performance. It can be concluded that it is possible to supplement with AMY during the role period of broiler chicken life or use an enzymatic program with AMY or AMY+XYL only in the grower phase.

Para avaliar o desempenho de frangos de corte alimentados com rações com diferentes programas de enzimas carboidrases, foram realizados dois experimentos. No experimento 1 as aves receberam suplementação de enzimas apenas na fase de crescimento foi observado redução no ganho de peso (GP) daqueles alimentados com a ração Controle Negativo (CN) ou seja, ração com redução de 120 kcal/kg. No entanto, quando os frangos receberam a ração CN + Amilase (AMI) + Xilanase (XIL) o GP foi semelhante encontrado no Controle Positivo (CP). No Experimento 2, algumas aves tiveram enzimas em todo período de criação e outras tiveram apenas na fase de crescimento. O tratamento CN apresentou pior conversão alimentar que o CP. Pode-se concluir que é possível suplementar com AMI todo o período de criação das aves ou utilizar um programa enzimático com AMI ou AMI + XIL somente na fase de crescimento, sem prejuízo ao desempenho das aves.