Performance of laying Japanese quail fed low protein diets supplemented with mentioning and lysine [electronic resouce].

Includes references.

A total number of 420 female Japanese quail 8 weeks of age were randomly distributed into 7 treatments, each containing 60 laying quail hens in three equal replicates. Four dietary crude protein levels were used in this work to study the effect of different levels of crude protein on the performance of laying quail hens. Crude protein levels were optimum level (22 %, T1), medium level (20 %, T2) and low levels (18 %, T3 and 16 %, T4). The diet contained 22 % CP and optimal levels of amino acids (T1) represents the control group . While, the other three diets were deficient in essential amino acids. Therefore, synthetic methionine and lysine were supplemented to these diets in order to maintain constant recommended levels of both methionine and lysine and considered as T5, T6 and T7, respectively. Laying quail hens were kept in cleaned and fumigated cages of wire floored batteries under similar conditions of management. Water and feed were offered ad – libitum under total of 16 hours light / day regimen up to 25 weeks of age. The overall results showed that feeding laying quail hens on diets containing medium or low levels of crude protein recorded significant decrease in egg production, egg weight and egg mass and increase in feed conversion values compared to the control group. Howevre , feed intake values significantly increased gradually with decreasing dietary crude protein levels . Supplementing both methionine and lysine to laying quail hen diets which containing medium or low levels of crude protein improved their performance of laying quail hens especially with medium protein diet . There was no improvement in economic efficiency values due to feeding laying quail hens on medium or low protein diets either with or without supplemental methionine and lysine.

Summary in Arabic.

1