The current research was conducted to study the effect of dietary supplemental of glycine (gly) levels 0.1 and 0.2 % on modulating productive performance in Mandarah (M) during laying period from 28 to 40 weeks (wks.) of age. The 1st treatment (T1) was fed the basic diet and served as the control treatment with no additional gly. The 2nd and 3rd treatments were fed the basic diet supplemented with 0.1 and 0.2 % gly/kg diet, respectively. Results indicated that hens fed (T2} and (T3) supplementation significantly improved feed conversion ratio for all intervals except from (28 to 30 wks. of age) compared to control. Egg number, egg weight and egg mass values were significantly increase in M hens fed diets containing T2 or T3 compared to control T1 during the whole period studied. Egg quality {shell (thickness and %), albumen %, yolk (% and index)} were significantly affected due to T2 and T3 supplementation to hens. Significant increases have been recorded in abdominal fat % and triglyceride (TG) values of hens in T2 and T3 compared to T1 (control) values at 40 (wks.) of age. Significant decreases have been recorded in litter traits (pH, moisture, nitrogen and ammonia %) of hens of T2 compared to control (T1) values at 40 wks. of age. The results of the current research indicated that gly supplementation during the laying period promoted the productive performance and had beneficial effects on quality of poultry litter.

The objective of this study was to evaluate the effect of low protein diet fortified with 0.2% glycine (gly) on Mandarah a native Egyptian strain chick's growth performance, carcass, small intestinal morphology, shank and keel bone length, blood parameters, growth hormone and blood antioxidant status during starter and growing periods (from 1 day to 12 weeks of age). A total number of 135 one day old Mandarah chicks were randomly divided into 3 equal groups with 3 equal replicates each. Control group (C) was fed normal crude protein diets (19% CP as starter and 17% CP for grower), group 2 (LP1) and 3 (LP2) fed 1.5 and 3% less crude protein respectively, than control supplemented with 0.2% glycine. Results indicated that LP1diet supplementation with glycine led to significant improvement in body weight (BW) during the starter period, and in feed conversion ratio (FCR) during the first 4 weeks of age. However, LP2+gly group recorded the lowest BW at 12 weeks of age, while recorded significantly better relative weights of carcass, liver, gizzard and spleen. Results also showed no significant differences in shank and keel length, goblet cell number, villi height, crypt depth, blood total antioxidant capacity, glutathione and all blood biochemical parameters. Glycine supplemented groups recorded significantly higher growth hormone values and lower litter moisture and litter nitrogen values. In conclusion adding glycine 0.2% to low protein diet (1.5% reduction) improve growth performance and litter quality of Mandarah local Egyptian strain during starter and grower periods.

The current study was carried out in the Animal Production Research Station, Sakha Kafr El-Sheikh Egypt belonging to Animal Production Research Institute (APRI Animal Production Research Institute (APRI), EGYPT. Two experiments were carried out to evaluate the effects of dietary amino acid supplementation (Methionine or lysine) in the diet of local chicken breed AL-SALAM on the performance and serum chemistry. The control group contained 0.2 g lysine / kg diet and 0.2 g methionine / kg diet. Lysine levels were 1.12, 1.37 and 1.6 g lysine / kg diet. Methionine levels were 0.60, 0.64 and 0.68 g methionine / kg diet. We found that when adding access amino acid lysine to the diet at level (1.6%) or adding access methionine at levels (0.64 % and 0.68 %) increased daily body weight gain significantly, compared with the control group. Lysozyme's activity was increased when adding access amino acid methionine (0.64 and 0.68%M) then levels (.12%L, 1.37%L, 1.60%L, and 0.60%M, respectively) than the control group. Relative economic efficiency was better when adding access levels (1.60%L or 0.64 and 0.68%M), than other groups. Finally, we suggest adding access lysine with levels 1.60 (%) or access methionine with levels 0.64 and 0.68 % to rations of local poultry breeds from 14 days to reach market weight to reveal the best economic profit gain and to promote the economic efficiency, with reasonable cost.