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The present study was carried out during winter months to estimate response of two Dandarawi chicken phenotypes (crested (Cr) and non-crested (cr)) to extra L-arginine (Arg) supplementation. Seventy two female from each of Cr and cr layer Dandarawi hens were chosen when egg production(EP) reached 50 %. The Cr and cr layer Dandarawi hens were distributed randomly into 3 experimental groups; each group includes 24 layer hens divided randomly into 3 replicates with 8 hens each. The 1 group from each phenotype fed control basal diet that satisfied recommendations of NRC. Groups 2 and 3 from each type fed basal diet supplemented with 2% and 4% Larginine over NRC requirements respectively for three winter months. Arginine supplemented by 14gm/100kg diet and 28gm/100kg to perform levels 2% and 4% respectively. The following results were obtained:Crested phenotype had higher significantly EP% and egg mass per hen per day than cr during 2 month and overall period moreover Cr laying hen consumed significantly lower diets than cr during the first month of EP and improved significantly feed conversion during the second month of EP. Significant decrease was observed in yolk percent of egg laid by Cr hens but significant increase was observed in shell thickness. Body temperature of Cr phenotype during chronic cold condition was lower by about 0.38°C than cr phenotype and had low significantly respiration rate. Diets supplemented with excess Arg recorded significantly (P ≤ 0.05) higher EP% than control diet during 2 month, 3 month and for overall period. Excess Arg supplementation reduced significantly feed intake during the 1 month of EP, but increased significantly feed intake during the 3 month. Increasing Arg level to 4% increased significantly (P ≤ 0.05) yolk percent and decreased significantly (P ≤ 0.05) albumin percent.

RESPONSE OF CRESTED AND NONCRESTED DANDARAWI CHICKENS TO EXCESS L-ARGININE SUPPLEMENTATION DURING WINTER MONTHS.