The use of enzymes as additives in broiler chicks diets (original) (raw)
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AFRICAN JOURNAL OF AGRICULTURAL RESEEARCH, 2012
This experiment was carried out to assess the effects of exogenous enzyme (ROXAZYME®, G2G) supplementation on digestibility of nutrients and metabolisability (ME/GE) in 28-31 days old male Ross 308 broilers. A total of 96 Ross 308 hybrids were allocated randomly to 6 dietary treatments with 4 replicates per treatments, and 4 birds per replicates. In this 3х2 factorial design trial with three different levels of metabolizable energy (13.4, 13.00, 12.6 MJ/kg), with and without exogenous enzyme, the nutrition density was reduced by introducing sunflower meal in different percentages to diet (0, 8 and 16%). The methods used to determine digestibility of nutrients and energy were total and partial collection method and ileal digesta (one percent of Celite was added to the diet for this purpose). Metabolizable energy level had a significant effect (p<0.05) on digestibility of DM, hemicelluloses and ME/GE. By lowering metabolizable energy level, the digestibility decreased. Enzyme supplementation significantly (p<0.05) improved the digestibility of NDF, hemicelluloses and ash determined by partial and total collection method, while statistically significant improvement in digestibility of crude protein was observed only by total collection method. Digestibility determined by ileal digesta showed only significant improvement (p<0.05) in digestibility of hemicelluloses, while the other nutrients had a certain improvement that was not significant. The results suggested that exogenous enzyme, used in this trial, increased digestibility of crude proteins, NDF, hemicelluloses and ash (р<0.05). However, the effects were most evident in diets with reduced level of metabolizable energy level and were determined by total and partial collection method. It can be concluded that the ME level affected digestibility of nutrients and energy, and that enzymes supplementation had the most profound effect on digestibility of nutrients and energy in diets with reduced ME level.
Revista Brasileira de Ciência Avícola, 2016
Two trials were performed to evaluate the effects of an enzyme complex (EC) on broiler performance, metabolizable energy, and phosphorus and nitrogen balance. In the first trial, 960 one-day-old male Cobb broilers were randomly distributed in a 3 x 2 factorial arrangement (three nutritional levels and the inclusion or not of EC), totaling six treatments with eight replicates of 20 birds per pen, and reared until 42 days of age. The control diet was formulated to meet the broilers' nutritional requirements. The other diets contained reduced available phosphorus (P), metabolizable energy, and amino acid levels, considering 100% and 150% of the EC nutritional matrix. The inclusion of the EC (200 g/ton) resulted in better broiler performance, improving weight gain in 4% and feed conversion ratio in 3% (p<0.05). In the second trial, 240 male broilers were randomly distributed into the same treatments with eight replicates of five birds per cage. The method of total excreta collection was used. There was an interaction (p<0.05) between diets and EC for P intake, nitrogen (N) intake, and N retention. The EC supplementation improved nitrogen-corrected apparent metabolizable energy values in 2.02% (p<0.05). Significant effects were observed on phosphorus and nitrogen balance (p<0.05). Phosphorus retention improved in 10.26%, nitrogen retention increased in 5.3%, while nitrogen excretion decreased in 3.3%. Based on the results of the present study, we recommend the addition of 200 g/t of the enzyme complex to broiler diets, considering nutrient reduction based on 100% of the EC nutritional matrix.
Biotehnologija u stocarstvu, 2011
In this 3?2 factorial design trial with three different levels of metabolizable energy (13.4, 13.00, 12.6 MJ/kg), with and without exogenous enzymes (nutrition density was reduced by introducing sunflower meal in different percentage to diet (0, 8 ? 16%)), the goal was to investigate the effects of exogenous enzymes Roxazyme G2G (cellulase (endo-1,4-(?-glucanase), ?- glucanase (endo-1,3(4)-?-glucanase) and xylanase (endo-1,4- ? xylanase)) on digestibility and energy utilization. Effects of enzymes were most visible in diet with 13.00 MJ/kg and 12.6 MJ/kg while this effect was unnoticed in the group with 13.4 MJ/kg. Reducing of ME caused the decrease in digestibility and metabolizability (ME/GE). The results suggest that exogenous enzymes, used in this trial, increase digestibility of crude proteins, NDF, hemicelluloses and ash (?<0.05), but the effects were most evident in diets with the reduced level of metabolizable energy.
Fayoum Journal of Agricultural Research and Development, 2007
This study was conducted using 390 unsexed day-old Arbor-Acres broiler strain chicks which, individually wing-banded, weighed and randomly distributed into 13 experimental groups of similar mean body weight of 3 replicates each and aimed to study the possibility of partially replacing dietary protein with canola meal (CM) protein with /without multicarbohydrase enzymes and its effect on growth performance, some carcass traits, some blood serum parameters and economical efficiency. An experimental corn-soybean meal starter and finisher basal diets were formulated in which dietary protein was replaced by CM protein at replacement ratios of 16, 32, 48 and 64%. Diets were formulated to be iso-nitrogenous and iso-caloric being 23% CP & 3000 kcal ME / kg for the starter diet and 20% CP & 3100 kcal ME/kg for the finisher diet. Thirteen dietary treatments were compared. One treatment consisted of the basal diet without CM (positive control diet). Four treatments consisted of the positive control diet supplemented with 16, 32, 48 or 64% CM without enzyme supplementation (negative control diets). Eight additional treatments consisted of the negative control diets supplemented with either Zympex ® 008 or Xylam 500 enzyme products at a level of 0.05%. Live growth performance, carcass characteristics, some blood serum parameters, sensory evaluation of cooked meat and economical efficiency were determined. From the nutritional and economical point of view, it could be concluded that substituting CM protein up to 48% for dietary protein in both starter and finisher broiler diets supplemented with Zympex ® 008 enzyme product at a level of 0.05% has no detrimental effect on broiler chick's growth performance and gave the best economical efficiency.
The Journal of Poultry Science, 2014
The effect of 3 multi-enzyme mixtures (MEM), A, B and C, having equivalent phytase activities but with different activities of carbohydrases (except invertase) and protease on growth performance and nutrient utilization in broiler chickens fed diets containing different types of cereals and industrial by-products was investigated. Day-old broiler chicks (N＝400) were distributed in a completely randomized design, with 8 treatments of 10 replicates each. Two control diets, one consisted of wheat, corn, soybean meal, canola meal and wheat-corn distillers dried grains with solubles (WCS), and one with sorghum, cottonseed meal, sunflower meal and brewer's dried grains (SCS) were formulated and fed to birds without or with one of the 3 MEM. Feed intake (FI) and body weight gain (BWG) were determined weekly. On day 20 excreta samples were collected for determination of total tract apparent retention (TTAR) of nutrients and nitrogen corrected apparent metabolizable energy (AME n). On day 22, eight birds per treatment were killed by cervical dislocation to collect jejunal and ileal digesta for determination of viscosity and apparent ileal digestibility (AID) of nutrients, respectively. Diet and enzyme interactions were only detected for overall feed conversion ratio (FCR, P＜0.001) with MEM B and MEM C shown to reduce overall FCR in birds offered SCS and WCS diets, respectively. Most observed differences were due to diet type showing that birds offered WCS diets had higher FI (P＜0.0001) and BWG (P＜0.0001) throughout the experiment, higher wk 1 FCR (P＜ 0.0001), higher AME n (P＜0.0001) and TTAR of P (P＜0.0001) and NDF (P＜0.0001) compared with SCS diets. In conclusion, the MEM did not affect growth performance and nutrient utilization though MEM B and MEM C acted differently to reduce overall FCR in birds offered SCS and WCS diets, respectively.
Acta Scientiarum. Animal Sciences
An experiment was carried out to investigate the effect of multi-enzyme in high and low levels of metabolizable energy (13.81 and 11.51 MJ kg-1 diet) on performance and energy utilization of broilers fed wheat-soybean meal diets from 0 to 21 days of age. Result showed that birds fed diets containing 11.51 MJ kg-1 consumed significantly (p < 0.05) more feed than diets containing 13.81 MJ kg-1 , whereas daily gain and feed conversion ratio improved (p < 0.05) when enzyme was added to 11.51 MJ kg-1 diet. There was significant improvement in metabolizable energy, net energy for production, organic and dry matter digestibility in 0-21 when diets supplemented with enzyme (p < 0.05). Addition of enzyme to 11.51 MJ kg-1 containing diet significantly (p < 0.05) reduced heat production of birds in 0-10 d, whereas heat production was not changed in 21 days. Supplementation of 11.51 MJ kg-1 diet with enzyme improved the efficiency of ME use for carcass energy and protein retention of broilers (p < 0.05). Generally, the results of current study demonstrated that addition of enzyme to wheat-soybean diets improved NEp of broiler chickens while MEI was not changed and it seems NEp is a more sensitive energy utilization response criterion to use in evaluating broilers response to enzyme supplementation.
Canadian Journal of Animal Science, 1999
Samples of wheat (54) and barley (87) were included in a series of broiler chick bioassays. For each cereal, fed at 80% of a basal diet with or without enzyme, apparent metabolizable energy (AME), retained nitrogen, digesta viscosity, excreta dry matter (DM), and broiler performance (feed intake, body weight [BW] gain, and feed conversion) were measured. Correlation coefficients were calculated between the predictor and the performance variables, separated according to whether or not the diets included feed enzymes. Some correlations between measures of AME and BW, feed efficiency, and to a lesser degree feed intake were significant, but none were high. The correlation coefficients were higher when feeds were not supplemented with an enzyme because enzyme supplementation reduced the variation in both AME and performance by reducing the antinutritive effects of non-starch polysaccharides (NSP). Including a measure of voluntary intake in AME (AME level multiplied by feed intake) resul...