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Abstract
This work was conducted to investigate the possible effect of certain essential amino acids supplementation in feed on quail performance concerning growth parameters, immune response, carcass quality as well as some biochemical parameters of Japanese quail during the growing period.
This work was performed in three experiments;
The first exp: studied the effect of dietary supplementation of Lys and/or Arg quail chicks in which group 1 was fed basal diet without supplementation (control). Quail chicks of groups 2, 3 and 4 fed on the basal diet supplemented with Arg at 110, 120 and 130% of the NRC (1994) requirement respectively. While quail chicks of groups 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 and 16 were fed basal diet supplemented Lys/Arg at ratios of 110/100, 110/110, 110/120, 110/130, 120/100, 120/110, 120/120, 120/130, 130/100, 130/110, 130/120 and 130/130 % NRC 1994.
The second exp. studied the effect of dietary supplementation of Arg and/or Met, the quail chicks in which the group 1 were fed basal diet without supplementation (control). Quail chicks of groups 2 and 3 fed on the basal diet supplemented with Met at 120 and 140% of the NRC (1994) requirement respectively. While quail chicks of group 4, 5, 6, 7, 8and 9 were fed basal diet supplemented Arg / Met at rates of 120/100, 120/120, 120/140, 140/100 140/120 and 140/140% NRC (1994), respectively.
The third exp. studied the effects of dietary supplementation of Lys and/or Met on the quail chicks in which group 1 were fed basal diet without supplementation (control), Quail chicks of groups 2 and 3 fed on the basal diet supplemented with Met at 120 and 140% of the NRC (1994) requirement respectively. While quail chicks of group 4, 5, 6, 7, 8and 9 were fed basal diet supplemented Lys/ Met at 120/100 120/120, 120/140, 140/100 140/120 and 140/140% NRC (1994) respectively.
The obtained results can be summarized as follows:
I- During 1st experiment:-
1- Group 5 (Lys/Arg, 110/100) have a non-significant increase (p<0.05) in body weight development while group 9 (Lys/Arg, 120/100) and group 13 (Lys/Arg, 130/100) have a numerical increase in body weight when compared with those of the control group.
2- There was a numerical increase in body weight development in groups 2, 3 and 4 which fed diets supplemented with Lys/Arg, 100/110, 100/120 and 100/130 respectively and the increase was with increasing the level of arginine supplementation.
3- Increasing both Arg and Lys supplementation had no effect on growth rates as in groups 15 and 16 which fed diets supplemented with Lys/Arg, 130/120 and 130/130 respectively.
4- The final FCR was improved in the groups 3 and 4 which fed diets supplemented with Lys/Arg (100/120 and 100/130 respectively) and this means that FCR was decreased with increasing Arg supplementation in the quail diets.