This experiment was conducted to evaluate the effect of different dietary levels (0, 5, 10, 15 or 20%) of Distillers Dried Grains with Solubles (DDGS). Each level was fed without or with two enzyme supplementation, (Kemzyme plus dry supplemented at 250 gm/ton feed or Polytec Binder plus ® ® supplemented at 500 gm/ton feed). A total number of 450 Inshas hens (30 wks old) and 45 cocks were distributed into 15 treatments of 30 hens, each in three replicates (10 hens and one cock, each). Diets were formulated to contain 16% CP and 2700 Kcal ME/Kg at laying period. Results show that no significant differences in digestibility coefficient values of Crude Protein (CP), Ether Extract (EE), Crude Fiber (CF), Nitrogen Free Extract (NFE), Body Weight Gain (BWG), feed intake and egg quality were observed by inclusion DDGS in laying hen diets. Also, results indicated that no significant effect on semen quality, fertility, hatchability and body weight of chicks in hatch by inclusion DDGS, enzyme supplementation or interaction between DDGS levels and enzyme supplementation in laying hen diets. Inclusion of 5% DDGS in laying diets significantly increased egg production %, egg number and egg mass, compared with the other levels. However, increasing DDGS to 15 or 20% in laying hen diets significantly increased yolk color and shell thickness and significantly decreased egg production %, egg number, egg weight and egg mass and gave the worst feed conversion compared with the other levels (0, 5 and 10%). Supplementation of Kemzyme plus dry (enzyme 1) to diets containing DDGS had significantly higher percentage of digestibility coefficient value ® of ether extract and increased egg production %, egg number and egg mass than those fed the other treatments. In conclusion, the present results show that DDGS can be successfully fed at levels up to 10% in laying hen diet without adverse effect on laying performance. Also, enzyme supplementation could improve the utilization of DDGS to levels up to 20% of the diet.
The aim of this study was to evaluate the effect of adding protease enzyme to low protein corn-soybean meal broiler diets to reduce feeding cost and improve the quality of meat. Two hundred and forty 1-d old unsexed Arbor Acres broiler chicks were distributed to six treatments (2*3 factorial design) of 4 replicates each. Two levels of protease activity (without and with 300 000 U/kg of the diet), and three levels of dietary crude protein were examined (Standard, STD; less 10% or less 15% from STD protein recommendation of each feeding phase, L10 and L15, respectively). The dietary protein levels were 23, 20.7and 19.5% at the starter phase; 21, 18.9 and 17.8% at the grower phase; and 19, 17.1 and 16.1% at the finisher phase. Diets were formulated to save the strain requirements of all other nutrients. All chicks were housed in open system broiler house and received the same managerial conditions and veterinary program during experimental period (1-40 d of age). Parameters of growth performance, carcass characteristics, physical and chemical evaluation of broiler meat were carried out and feeding cost was calculated. The recorded results showed that using protease improved final body weight (4.1%) and feed conversion ratio (6.1%) and reduced skin% of drum stick significantly (P<0.05). Decreasing protein of diets to (L15) increased consumed feed, drip loss of thigh, and back quarter weight (thigh and drumstick). Also, skin and pH of breast and concentrations of low density lipoprotein and malondialdhyde (MDA) in broiler meat were depressed significantly (p<0.0001). Among all treatments results showed that adding protease to L10 diets recorded the same marketing weight (2015 g), made broiler meat healthier (MDA decreased by 36%), and depressed the feeding cost/kg of life body weight by 3.94% relative to value calculated for STD group. Generally it could be concluded that adding 300,000 U protease enzyme/kg to low protein broiler diets could help producers to achieve acceptable marketing weight, get better meat quality, and reduce feeding cost according to Egyptian prices of feed ingredients.
his experiment was conducted to study the ability of supplemental xylanase enzyme (Xyl) to improve growth performance, carcass traits, meat quality and feeding cost of broilers fed on low metabolizable energy (ME) corn-soybean meal diets. Two hundred and forty, one day old unsexed Arbor Acres broiler chicks were randomly distributed into six treatments (2x3 factorial design) each had four replicates. Chicks were fed on corn-soybean diet supplemented with two levels of Xyl (0 and16000 U/kg of diet), and three ME levels which were standard strain recommendation (STD), 100 kcal lower than STD (E100) and 150 kcal lower than STD (E150) of each feeding phase for STD, E100, and E150 levels, respectively. The dietary ME values were 3000, 2900 and 2850 kcal/kg diet at starter phase; 3100, 3000 and 2950 kcal /kg at grower phase; and 3200, 3100 and 3050 kcal/kg at the finisher phase. All diets were formulated to save the strain requirements from the rest of nutrients. All chicks were housed in open system broiler house and received the same managerial conditions and veterinary program during experimental period (1-40 d of age). Parameters of growth performance, carcass characteristics, physical and chemical evaluation of broiler meat were carried out and feeding cost was calculated. The recorded results showed that xylanase supplementation to broiler diets resulted in significant improvement of body weight, body weight gain, feed conversion ratio, dressing %, and breast meat yield %, while feed intake and ultimate pH (pHu) of both breast and thigh cuts were decreased. Regarding to ME of diets, reducing ME values from STD level to E150 level caused significant reduction in final body weight, abdominal fat %, pHu of breast meat samples and concentrations of malondialdehyde (MDA) and low density lipoprotein (LDL). Furthermore this reduction of ME levels caused significant increase of feed intake, % of drum stick and concentration of total protein of broiler meat at 40 d of age. Among experimental treatments chicks of both STD+Xyl and E100+Xyl treatments showed better growth performance, carcass traits, and meat quality compared with other treatments. In addition applying these treatments resulted in saving 9.25 % and 3.51% from feeding cost/kg of body weight relative to feeding cost of STD group. According to these results it could be concluded that adding xylanase enzyme to either STD or E100 corn-soybean meal broiler diets could enhance the quality of produced broiler accompanied with saving in feeding cost.
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