Methionine and lysine supplementations either in diets or drinking water of one-phase low dietary protein feeding system for laying hens: 2- Effects on laying performance, feed utilization, egg quality and digestibility [electronic resource].

Includes references.

This work was conducted to study the effect of methionine and lysine supplementation to the level of 120% of requirements either in feed (F) or drinking water (W) for one-phase low protein diet on laying performance, feed utilization, egg quality and digestibility. A total number of 180 H&N females pullets of 19 weeks of age (previously divided into control (C), F treatment and W treatment during growing period) were classified into 9 experimental groups, 20 pullets for treatment, in 5 replicates, 4 birds each, as C/C, F/C, W/C, CIF, FIF, WIF, C/W, F/W and W/W groups. Control diet (C) during laying period contained 19, 18, 17 and 16% crude protein (CP) as strain requirements, while experimental diet F and W contained 15% crude protein (CP). All diets were iso-calorie and iso-nitrogenous. Results obtained could be summarized as follows: - The lowest (P<0.05) final body weight obtained by FIF group (1.696 kg); while control group (C/C) attained highest (P< 0.05) final body weight (1.889 kg). - Birds in WIF group recorded higher values in total egg number (105.6) and rate of egg production (75.26%) compared to the other experimental groups, while the heaviest egg mass recorded by control group (6.111 kg /hen) followed by WIF group (5.959 kg /hen). The lowest egg mass obtained by FIF group (4.844 kg/hen) followed by CIF group (4.852 kg/hen).

Summary in Arabic.

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