الفهرس 
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Abstract
A total number of 64 New-Zealand White rabbits (32 males + 32 females) aged 6 weeks was randomly divided into 8 groups. Each group was subdivided into 8 replicates (4 males + 4 females) and housed individually in a wire cages located in a controlled environmental temperature house (20 – 22 °C). Rabbits were fed ad-libitum on high (17% CP) or low (15% CP) level of crude protein and injected one, two or three times with Ca-Aminoplex at bi-weekly intervals. Also, 24 rabbit does and 8 bucks at the age of 24 weeks were used to study the effect of Ca-Aminoplex on some reproductive performance. Ca-Aminoplex is a solution contain some essential Amino acids, vitamin B complex and calcium.
The results revealed the following : -
1 – Rabbits fed in high protein level had higher (P≤ 0.01) body weight compared to those fed on low protein level at 12 and 14 weeks of age. Similar trend was also observed in body weight gain during the periods from 6-8, 6-10, 6-12 and 6-14 weeks of age.
2 – Rabbits injected two or three times with Ca-Aminoplex recorded higher (P≤ 0.05) body weight compared to those injected one time or not injected (control treatment) at 10, 12 and 14 weeks of age.
3 – Rabbits injected one, two or three times with Ca-Aminoplex was superior (P≤ 0.05) in body weight gain during all experimental periods (from 6-14 weeks of age) compared to those in the control treatment (not injected).
4 – Rabbits fed on the high protein level (17 % CP) consumed higher feed (P≤ 0.01) compared to those fed on low protein level (15% CP) all over the experimental periods (from 6-14 weeks of age).
5 – Injection growing rabbits two or three times with Ca-Aminoplex enhanced (P≤ 0.05) feed consumption all over the experimental periods (from 6-14 wks. of age( while injection one time improved (P≤ 0.05) feed consumption only during the first stage (from 6-10 wks. of age) of the growing period.
6 – Rabbits fed on high protein diet had superior (P≤ 0.05 or P≤ 0.01) cumulative feed conversion ratios compared to those fed on low protein diet all over the experimental periods (from 6-14 weeks old).
7 – Rabbits injected one, two or three times with Ca-Aminoplex had better (P≤ 0.05) cumulative feed conversion ratios than those not injected (control) during all studied ages (from 6-14 wks. old).
8 – Rabbits fed on high protein diet (17% CP) consumed higher (P≤ 0.01) crude protein and metabolizable energy compared to those fed on low (15% CP) protein diet.
9 – Protein conversion ratio was inferior (P≤ 0.01) but energy conversion ratio was superior for rabbits fed on high protein level (17% CP) compared to those fed on low protein level.
10 – Injection of rabbits two or three times with Ca-Aminoplex enhanced (P≤ 0.05) cumulative crude protein and ME-consumption and improved (P≤ 0.05) the utilization of both crude protein and ME energy compared to those injected one time or not injected (control) all over the experimental periods (from 6-14 weeks old).
11 – Rabbits fed on low protein diet (15% CP) recorded higher (P≤ 0.01) DM, OM, CP and NFE digestibility coefficients than those fed on high protein level (17% CP), while the effect of protein level on EE and CF digestibilities were insignificant.
12 – Feeding growing rabbits on the diet of high protein level (17% CP) increased (P≤ 0.01) the cost of feed/rabbit, rabbit price, absolute and relative net revenue and production efficiency factor compared to those fed on the diet of low protein level (15% CP).
13 – Ca-Aminoplex injection increased (P≤ 0.05) the cost of feed/rabbit, but it improved rabbit price, absolute and relative net revenue and production efficiency factor of growing rabbits.
14 – Injection rabbit does one, two or three times with Ca-Aminoplex insignificantly improved litter size and litter weight at weaning, total milk yield and kits viability.
CONCLUSION
Feeding growing rabbits on the diet of 15% crude protein decreased the growth performance.
Injection with Ca-Aminoplex two or three times improved the growth performance of growing rabbits and can alleviate the adverse effect of decreasing the level of CP in the diet of growing rabbits without noticeable effect on some reproductive performance.