RAVINDER REDDY, V(MAJOR)CHINNI PREETAM, VREDDY, M.RKONDAL REDDY, KSRINATH, K2018-11-142018-11-142011-09http://krishikosh.egranth.ac.in/handle/1/5810083377THESESABSTRACT: The effect of feeding encapsulated enzymes in corn soya pelleted diets on the performance of broilers was studied. The enzyme supplementations like phytase, xylanase and cocktail (cellulase, xylanase, pectinase, mannanase, glucanase, amylase, and protease) available in market were procured, encapsulatecUcoated with sodium alginate and included to corn-soya diet at recommended doses. The feed was then pelleted at 80°C in a steam conditioner of 0.6 MPa for 10 s. The enzyme combinations were offered to nine groups, each consist of 30 male broiler chicks (Vencobb) from day old to 6 weeks of age. The chicks were raised on wire floor electrically heated battery brooders; feed and water were provided ad libitum. The performance of broilers in terms of body weight gain, feed consumption, feed efficiency, livability, dressing yield, relative length of small intestine in centimeters, proventriculus weight, abdominal fat weight and relative weights of giblets. Lymphoid organs such as thymus, bursa and spleen weights, which were expressed as percentage of live body weight, were also In the present study broilers showed significantly (P(0.05) increased body weight gains on supplementation of uncda nd coated ~eto corsn-soya diet during finisher phase (4-6 weeks) and overall period (0-6 weeks) than the control diet. Coated enzyme supplemented diets yielded significantly (P<0.05) increased body weight gains over their respective uncoated supplemented diets during starter phase (0- 3 weeks) , finisher phase(4-6 weeks) and overall period (0-6 weeks) except in coated phytase supplemented diet which only resulted in significantly (P<0.05) increased body weight gain over uncoated phytase supplen~ented diet (T2) during finisher phase (4-6 weeks). Feed intake of broilers on supplementation of uncoated and coated enzymes to corn- soya diet showed no significant difference during 1-6 week of age when compared to control diet. Supplementation of uncoated and coated enzymes in pelletized corn soya diet yielded significantly (Pc0.05) efficient feed to weight gain values over the control diet during finisher phase (4-6 weeks) and overall period (0-6 weeks). Coated enzyme supplemented diets yielded significantly (Pc0.05) efficient feed to weight gain values over their respective uncoated enzyme supplemented diets during finisher phase (4-6 weeks) and overall period (0-6 weeks). Supplementation of uncoated or coated enzyme preparations to corn soya diet did not influence the livability, dressing percent, abdominal fat weight, proventriculus weight, visceral organ weights (liver, lleart, and gizzard), intestinal lengths (cm) and weights of immune organs (thymus, bursa and spleen) in broilers. In vitro feed analysis of release of total sugars (mg/gm diet) from uncoated and coated enzymes supplemented pelletized corn soya diets yielded higher values of total sugars (mglgm feed) in enzyme treated diets than control diet in both starter and finisher feed. Coated enzyme supplemented diets yielded higher values of total sugars (mg/grn feed) over their respective uncoated enzyme supplemented diets in both starter and finisher feed. In viho fced analysis of release of inorganic phosphorous (g/kg diet) from phytase enzyme supplemented corn-soya pelleted diets yielded higher values of inorganic phosphorous release in ooated phytase supplemented diets than uncoated phytase supplemented diets. However, both uncoated and coated phytase enzyme supplemented diets yielded higher inorganic phosphorous values than control diet. The returns over feed cost of Rs 48.31 to 50.94 per bird on uncoated enzyme supplemented diets as against Rs 44.05 on control diet. The return over feed cost was Rs 55.32 to 51.58 on coated enzymes supplemented diets. It is concluded that supplementation of coated enzymes offered better protection against pelletization temperature and gastric conditions in the gut there by retaining maximum efficacy over uncoated enzymes. Hence, coating of enzymes is suggestedennullThesis