الفهرس | Only 14 pages are availabe for public view |
Abstract The present study was carried out at Inshas Poultry Research farm to investigate the potential effects of lead acetate and chromium chloride supplementation on some productive, physiological and immunological performance in layers. A total number of 360 hens of Silver Montazh chicken strain (SM) and Matrouh chicken strain (M), 180 each were randomly divided into 6 treatment groups 30 hens each. The first group was fed on the basal diet without any additives (Control), the second group was fed on the basal diet with 100 mg/kg (CrCl3), the third group was fed on the basal diet with 50 mg/kg of (CrCl3), the fourth group was fed on the basal diet with 25 mg/kg of (Pb acetate) mg/kg lead + 50 mg/kg of (CrCl3), the fifth group was fed on the basal diet with 25 mg/kg of Pb as (Pb acetate), the sixth group was fed on the basal diet with 50 mg/kg of Pb as (Pb acetate). The birds were fed on these additives during the whole experiment period, from 24 to 40 weeks of age. - Results of the study showed that live body weight (LBW) was significantly decreased in a dose dependent manner while, body weight gain (BWG) was not significantly changed. While, age had a significant effect on both LBW and BWG. - Dietary Pb acetate supplements had no effect on egg production traits as well as feed consumption and feed conversion ratio. There were significant increases in the previous parameters due to age, however, feed consumption was not affected. - Egg quality traits were insignificantly affected by dietary Pb acetate. However, these parameters were significantly changed with age. On the other hand, Haugh unit was significantly affected due to Pb acetate supplementation and with age. - Plasma calcium, phosphorus, AST, total protein, albumin and alkaline phosphatase activity were not affected by Pb acetate supplements. While, plasma ALT were significantly increased.Hemeagglutination inhibition test as an indicator for immuno response against avian Influenza was significantly improved by CrCl3 supplements. Litter ammonia and litter humidity were insignificantly affected by Pb acetate supplementation. While, they were significantly increased with age due to their accumulation in indoor laying hens house. It is concluded from the results that CrCl3 addition could alleviate the deleterious effect of lead pollution on the productive, physiological and immunological performance of laying hens. |