الفهرس 
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Abstract
The present study was conducted at the poultry physiology rabbit’s Laboratory belonging to the Faculty of Agriculture, Ain Shams University, Egypt. The experimental period was seven weeks, from June to August 2019. The main objective was to further elucidate the impact of enzymes and zinc supplementation on productive and physiological performance of growing rabbits under heat stress conditions.
Experimental design:-
G1: Rabbits were fed the diet basal as a control group.
G2: Rabbits were fed the diet basal + 100mg zinc*/ kg diet.
G3: Rabbits were fed the diet basal + 500gm Frazyme M.S.**/Ton diet.
G4: Rabbits were fed the diet basal + 1000gm Frazyme M.S./Ton diet.
G5: Rabbits were fed the diet basal + 100mg zinc +500gm Frazyme M.S./Ton diet.
Animals and housing:
Forty weaned Alexandria rabbits of both sexes, where the number of males and females was equal in all groups, at about 4 weeks old and weighing about 471.3029.8 g were used in this study. Each treatment was sub-divided into 4 replicates of 2 rabbits. Rabbits were housed in multi-floor cages of (40×35×30 cm, 0.14 m2) with one nipple drinker and one hopper feeder (30 cm available) in each cage.
The cages were arranged in rows, in a house naturally ventilated. A 16:8 hrs, (light: dark) was used throughout the experimental period. Feed and water were offered ad libitum. Individual LBW and FI were recoded, while average BWG and FCR were calculated weekly from 4 to 11 weeks of age.
At the end of 11th week at Marketing of age, three rabbits from each treatment were randomly chosen and slaughtered after fasting for 12
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SUMMARY AND CONCLUSION
Sara E. Swif (2023), M.Sc., Fac. Agric., Ain Shams Univ.
hrs. After sacrificing, internal organs (liver, heart, kidneys), were carefully removed and weight.
The results indicated that:
1- Rabbits fed diet supplemented with 500 gm of Frazyme M.S./ton feed had higher final body weight by 6.09, 5.13, 1.88 and 2.45% compared with G1, G2, G4 and G5, respectively.
2- Rabbits fed diet supplemented with 500 or 1000 gm of Frazyme M.S./ton feed had higher DWG by 7.76% compared with G1 and the differences were significant (P≤0.05).
3- Relative growth rate for rabbits fed diet supplemented with 500 or 1000 gm of Frazyme M.S./ton feed had higher growth rate by 3.11, 5.13 and 2.01% for groups G1, G3, G4 and G5, respectively, compared with the G1 group.
4- Daily feed intake for rabbits fed diet supplemented with Zn or Frazyme M.S. had slightly insignificant reduced of daily feed intake for G2, G3 and G4, respectively, compared with G1 group.
5- Feed conversion ratio of rabbits fed diet supplemented with 500 or 1000 gm of Frazyme M.S./ton feed (G3 and G4) had best FCR compared with other groups (G1, G2 and G5), and the differences were significant (P≤0.05) between G3 and G4, and other groups.
6- Hot carcass (%) in G2, G3 and G4 were higher value comparable with G1 group.
7- Tow shoulders percentage of rabbits in G2, G3, G4 and G5 were significantly (P≤0.05) decreased (27.4, 22.0, 17.8 and 11.7%), respectively, comparable with G1 group.
8- WBCs of rabbits were significantly (P≤0.05) decrease in all treated groups comparable with G1 group.
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SUMMARY AND CONCLUSION
Sara E. Swif (2023), M.Sc., Fac. Agric., Ain Shams Univ.
9- Total protein was affected negatively by treatment except for G4 compared with the G1 group.
10- Albumin was increased significantly (P≤0.05) by treatment except for G2 compared with the G1 group.
11- Globulin was decreased significantly (P≤0.05) by treatment except for G4 compared with the G1 group.
12- Rabbits in all treated groups showed significantly (P≤0.05) higher serum cholesterol and triglycerides concentrations compared with G1 group.
13- Rabbits in (G3 and G5) had significantly (P≤0.05) higher digestibility by 5.42 and 3.12% compared with G1 group, respectively.
14- Rabbits fed diet supplemented with zinc (G2 and G5) had significantly (P≤0.05) lower relative economic efficiency by 8.22 and 9.77% compared with G1 group., respectively, however, Rabbits in (G3 and G4) had significantly (P≤0.05) higher relative economic efficiency by 11.1 and 10.5% compared with G1 group.
Recommendation:
It could be recommended that, using diets contains 500 g Frazyme M.S. M.S./ton diet for growing rabbits to improving growth performance, physiological response, and economic efficiency.