Abstract
Abstract
The aim of the study is to know the Individual and synergistic effect of adding astaxanthin and magnolol compared to vitamin E on productive performance and some indicators of oxidative stress and liver enzymes in the blood serum of laying hens type Lohman Brown, the experiment continued for five periods (28 days, period−1) from 3/20/2022 to 8/7/2022 (20 weeks), in which 120 laying hens of 52 weeks of age were used, distributed randomly to eight experimental treatments, with five replicates for one treatment and three chickens for one replicate, the treatments included: the first treatment (control treatment) basal diet without addition, the second treatment adding vitamin E 300 mg/kg feed, the third and fourth treatments adding astaxanthin 200 and 400 mg/kg feed sequentially, the fifth and sixth treatments adding magnolol 200 and 400 mg/kg of feed sequentially and the seventh and eighth treatments added a mixture of astaxanthin 100 mg/kg of feed + magnolol 100 mg/kg of feed and 200 mg/kg of feed + magnolol 200 mg/kg of feed sequentially to the diet. The results showed that there were no significant differences between the different experimental treatments in the percentage of cumulative egg production (140 days). We conclude from the study that the addition of natural antioxidants to the diet leads to an improvement in productive performance and some Indicators of oxidative stress in the serum of aged laying hens that were reared during temperate and hot times in Iraqi climates.