الفهرس 
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Abstract
The present study was carried out at the breeding rabbit farm in Borg El Arab city, Alexandria governorate, from January to April 2021. This study was carried out to evaluate the effects of Aloe vera extract (AVE) extract supplementation on the productive
performance, and immune system of growing rabbits, and the reproductive, semen quality, and physiological characteristics of rabbit bucks.
All data and animal care procedures were approved by the Research Ethics Review
Committee in the Faculty of Agriculture, Alexandria University, Egypt with the review report serial number Alex. Agri. 092310218.
The Pilot Experimental
The aim of this experiment was to determine the ideal level for Aloe vera extract (AVE) soluble in fresh water to be used in the experiment. A total number of 80 weaned V-line rabbits (unsexed) aged four weeks were used in this study. Rabbits were randomly distributed into four groups of 20 rabbits each. Each group was subdivided into 5 replicates (4 rabbits
each). The rabbits of the 2nd, 3rd, and 4th groups were given 5 (PT1), 10 (PT2), and 15 (PT3) ml AVE per liter of tap water every day throughout the experiment period, respectively for
five weeks from 4 to 9 weeks of age. The first group was drinking tap water without AVE and served as control (PT0).
The main results of the pilot experiment can be summarized:
This result indicated that the different levels of AVE lowered the LBW of rabbits. The lowest body weight gain was obtained by supplementing with different levels of AVE, while the lowest body weight gain was found with the higher group PT3 (15 ml AVE/ L tap water).
At the end of the experimental period, there was a significant decrease (P=0.001) in all groups of rabbits supplemented with different levels of AVE when compared with the control group. Treated rabbits with AVE had significantly worse FCR than the control group. Water consumption significantly decreased by supplementation AVE reach to 76.4, 54.5, and 48.1 % of control with the different levels of AVE (5, 10, and 15 ml/ L tap water every day),
respectively.
This result indicated that the different levels of AVE increased the mortality rate of rabbits, the highest mortality rate was found with the groups of PT2 and PT3 groups. In the present study, a progressive decrease in productive performance was observed with increased
levels of Aloe vera extract (AVE). Therefore, less than 5 ml AVE/ L tap water level was used and levels were adjusted from every day to day by day.
The First Experiment (Growing Rabbits (
Based on the collected data from the pilot experiment, low doses of AVE were used, less than 5 ml/ L tap water for growing rabbits. A total number of 140 weaned V line rabbits (unsexed) aged four weeks were used in this study. Rabbits were randomly distributed into
seven groups of 20 rabbits each. Each group was subdivided into 5 replicates (4 rabbits each).
The rabbits of the 2nd, 3rd, and 4th groups (T2, T3, and T4) were drinking tap water containing 881, 2, and, 4 ml AVE/ L freshwater every day, respectively and the rabbits of the 5th, 6th, and 7th groups (T5, T6, and T7) were drinking tap water containing 1-, 2-, and 4-ml AVE/ L freshwater day by day, respectively for five weeks; the first group (T1) was drinking tap water
without AVE and served as control.