This experiment was conducted in the poultry field of the Department of Animal Production College of Agriculture Al-Qasim Green University for” the period 1/10 /2021 to 4/11/2021 The study aimed to add different levels of Chenopodium quinoa seed “powder to the diet and vitamin C to the drinking water to know the best levels of quinoa seed powder to the diet that can be used in poultry diets. In the experiment 225 unsexed broiler chicks Ross 308 were used distributed randomly to 15 cages with 5 experimental treatments for “each treatment” of “45 birds and each treatment included three replicates for each replicate of 15 birds. The experimental treatments were as follows The first treatment” the “control treatment” basic diet free of any addition whether in feed or drinking water. The second treatment add 12 g of quinoa seeds/kg of feed the third treatment add 14 g of quinoa seeds/kg of feed the fourth treatment add 16 g of quinoa seeds/kg of feed the fifth treatment add 300 “mg of vitamin C/L of drinking water. The most important results “of the” study can be summarized which is a significantly improvement (“P≤0.09”) for the third fourth and fifth” treatments in “the” average live body weight “in the fifth week and the total weight” gain “compared” to “the first treatment. As for feed consumption “there were no significant differences between all treatments while the third fourth and fifth treatments recorded the best cumulative food conversion ratio with a significant difference (P≤0.09) compared to the first treatment” and no deaths were recorded among birds during the experiment period

This experiment was conducted in the poultry" field "of the" Department of "Animal Production, College of Agriculture, Al-Qasim Green University for" the period "1/10"/2021 until 4/11/2021. The study aimed to add different levels of Chenopodium quinoa seed "powder to the diet and" vitamin C "to" the "drinking water" to know "the" best levels of quinoa seed powder to the diet that can be used in poultry diets. "In the experiment, 225 unsexed broiler chicks (Ross 308") were used, distributed randomly to 15 (cages) with 5 experimental treatments for "each treatment" of "45 birds, and each treatment" included "three replicates" for "each replicate of 15 birds. The "experimental treatments were as follows: The first treatment: control treatment" (basic diet "free of" any addition, whether in feed or drinking water). The second treatment: add 12 g of quinoa seeds/kg of feed; the third treatment: add 14 g of quinoa seeds/kg of feed; the fourth treatment: add 16 g of quinoa seeds/kg of feed; the fifth treatment: add 300 mg of vitamin C/liter of drinking water. The results of the experiment showed a significantly excelled (P≤0.05) for the "third, fourth, and fifth treatments" in total protein "concentration compared to the first treatment" (control). As for "the concentration of" albumin and globulin, no significant differences were recorded among all treatments. "As for the concentration of" cholesterol and low-"density lipoproteins, the second, third," fourth, and fifth "treatments" showed "a significant decrease (P≤0.05") compared to "the" first treatment (control) "and a significant increase (P≤0.05) in the concentration" of high-density lipoproteins Keywords: Chenopodium quinoa seed, vitamin C, biochemical traits, broilers Ross 308