The main objective of this study was aimed to investigate the effects of different ambient temperature {normal temperature (NT) and heat stress (HS) conditions} and dietary supplementation of different selenium (Se) source (inorganic , organic and Nano Se) on some productive performance and physiological parameters for Sinai chickens during growth period and A total of 198, 8-wks-old of Sinai chickens were used and randomly distributed into two experimental groups (NT& HS), and then each group was divided into three sub-groups (inorganic , organic and Nano Se) in a factorial design (2x3). Chickens fed diet naturally contaminated with Aflatoxin (AFB1),7.50 µg/kg DM.The results indicated that heat stress resulted in a significant decrease in body weight and gain, feed intake and feed conversion. Lymphocytes (L) cells (%), plasma total protein and albumin were significantly decreased for chickens reared under heat stress, however, hemoglobin (Hb) concentration, white blood cells count, eosinophils cells (%), monocytes cells (%),globulin, calcium and phosphorus were not significantly affected. Moreover, a significant increases were recorded for red blood cells (RBC) count, heterophils (H) cells (%) , H / L ratio, plasma total antioxidant capacity (TAOC) and heat shock protein 70 for Sinai chickens reared under heat stress than those reared in thermo neutral during all the experimental periods.Supplementing different selenium sources to the diet had no significant effect on body weight and gain, rectal temperature and respiratory rate, albumin, calcium, phosphor and heat shock protein 70 for Sinai chickens than those fed the control diet. Moreover, feed intake, plasma H (%), and H / L were significantly decreased as a result of supplementing Nano selenium to the diet during the periods of 12-16 and 8-16 wks of age than the control. While, feed conversion was significantly improved by supplementing different sources of Se to Sinai chickens diet than the control. Significant increases were recorded in RBC count, Hb concentration and L cells (%), total protein, globulin and total antioxidant capacity for Sinai chickens fed diet supplemented with Se as compared with those fed the control diet. These results indicated that heat stress severely reduced productive and physiological performance for Sinai chickens, whereas the productive and physiological performance was improved by dietary Se sources supplementation under heat stress.

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.

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