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This study was conducted in the poultry field of the Department of Animal Production/ College of Agriculture/ University of Anbar, from 28/10/2021 to 8/12/2021. A total of 192 unsexed, one day, 40 gm of Ross 308 broiler were used, the chicks were randomly distributed to 4 treatments with 4 replicates for each treatment (12 chicks per replicate), the treatments were as follow: T1 (control): The energy level was 3001.5, 3103 and 3151 kilo calorie per 1 kg of diet for starter, grower and finisher respectively. T2: The energy level was 3149, 3231 and 3340 kilo calorie per 1 kg of diet for starter, grower and finisher respectively. Treatment T3: The he energy level was 2850.5, 2950 and 3151 kilo calorie per 1 kg of diet for starter, grower and finisher respectively. Treatment T4: The energy level was 2850.5, 2950 and 3205 kilo calorie per 1 kg of diet for starter, grower and finisher respectively. The results of the study concluded that the use of different levels of energy in the diets did not have any significant effect at (P≤0.05) on some characteristics of the productive performance of broilers. (P≤0.05) in the second week, where the second treatment outperformed the fourth treatment. As for the fourth week, the first and third treatments were significantly superior at (P≤0.05) over the fourth treatment. In the fifth week, the first, second and third treatment were significantly superior to the fourth treatment at (P≤0.05), as well as the weight gain, where a significant difference occurred in the second week, where the second treatment was significantly superior to the fourth treatment at (P≤0.05). As well as the third week, the first and third treatment were significantly superior to the second treatment at (P≤0.05). As for the relative growth rate, a significant difference occurred only in the third week, where the first, third and fourth treatment were significantly superior to the second treatment at (P≤0.05). As for the use of different levels of energy during the growth period, it had no effect on the characteristics of the carcass except for the weight of the chest, where the first, second and third treatments were significantly superior at (P≤0.05) over the fourth treatment.

Copyright of Anbar Journal of Agricultural Sciences is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This study was conducted in the Layer farm of Animal production department/ College of Agriculture, University of Anbar, for the period from 20/ 7/ 2021 to 15/ 10/ 2021, to study the Effect of vitamin D3 addition and various particle size of oyster shells to production diets in laying hens productive performance. In this study, 108 Lohman Brown laying hens, 43 weeks were distributed randomly in to nine groups, four replicates for each one three hens reared in cages (cm). The experimental treatments were as follows: T1 normal diet (control group), T2/ calcium source 50% limestone + 50% oyster shell size less than 1 mm + vitamin D3 4000 IU kg-1, T3/ calcium source 50% limestone +50 % oyster shell size 1-2 mm + vitamin D3 4000 IU kg-1, T4 / calcium source 50% limestone + 50% oyster shell size 2-3 mm + vitamin D3 4000 IU kg-1, T5/ calcium source 50% Limestone + 50% oyster shell size 3–5 mm + Vitamin D3 4000 IU kg-1, T6/ Calcium source 50% limestone + 50% oyster shell size less than 1 mm + Vitamin D3 8000 IU kg-1, T7/ Calcium source 50% limestone + 50% oyster shell 1-2 mm + Vitamin D3 8000 IU kg-1, T8 Calcium source 50% limestone + 50% oyster shell 2-3 mm + Vitamin D3 8000 IU kg-1, T9/ Calcium source 50% limestone +50% oyster shell size 3-5mm + Vitamin D3 8000 IU kg-1. results showed no significant differences in daily feed consumption ratio, feed conversion coefficient, egg mass and egg production in the three periods of the experiment and in average. significant improvement (P≤0.05) in average egg weight during third productive period of the experiment for the second, fifth, sixth, seventh, eighth and ninth treatments compared to the other treatments.

Copyright of Anbar Journal of Agricultural Sciences is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)