PRODUCTIVE AND REPRODUCTIVE PERFORMANCE STUDIES ON LAYERS EXPOSED TO LEAD AND THE ROLE OF NATURAL CLAY IN REDUCING,ADVERSE EFFECTS OF LEAD POISONING. | ||||
| Journal of Animal and Poultry Production | ||||
| Article 6, Volume 29, Issue 3, March 2004, Page 1149-1167 PDF (319.37 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2004.239141 | ||||
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| Authors | ||||
| M. E. Nofal,; H. A. Abou-Khashaba; M. A. lbrahem | ||||
| Animal Production Research Institute, Agriculture Research Center, Ministry of Agriculture, Dokki, Cairo, Egypt. | ||||
| Abstract | ||||
| This study was conducted to investigate the effect of lead acetate- polluted diet ingestion on some productive and reproductive performance of laying hens, and try to employ some useful properties of clay for reducing the adverse effect of lead contamination. A total number of 180 Gimmizah laying hens at 32 weeks of age were randomly, distributed equally into nine treatments. Birds were offered (1) basal diet; (2) basal diet + 250 ppm Pb ;(3) basal diet + 250 ppm Pb +2.5% clay; (4) basal diet + 250 ppm Pb +5% clay; (5) basal diet + 500 ppm Pb; (6) basal diet +500 ppm Pb +2.5% clay; (7) basal diet + 500 ppm lead+5 % clay; (8) basal diet +2.5% clay and (9) basal diet. + 5% clay. Body weight, weight gain; egg production, feed conversion, egg quality, fertility; hatchability and economical efficiency were determined for two times. The first time was after the positive experimental period and the second time was after the negative experimental period. Results obtained for the first period indicated that. lead - polluted diets significantly decreased weight gain; egg number; hen day percentage; egg mass (g {day); feed conversion (g feed{ g egg )day ; shell weight and percentage, yolk weight and percentage, Haugh units score, fertility percentage and hatchability percentage. However, feed intake, egg weight, albumen weight and percentage and embryonic mortality percentage without piping were significantly increased. Adding clay to lead polluted diets significantly reduced the adverse effect of lead in the previous parameters. Supplementation of clay to the diet only insignificantly increased, weight gain, egg production percentage, egg weight, egg mass (g {day )and improved feed conversion, while the finial body weight; egg mass (g {day); feed intake; egg components weight and percentage; Haugh units score; fertility and hatchability percentages and embryonic mortality percentage without piping were not significantly affected by feeding natural clay in laying diets. After the negative experimental period all the previous parameters were go back around the control and the differences were not significant except, feed intake which significantly decreased, but egg weight, shape index, yolk weight and albumen weight were fluctuating as compared with control. It could be concluded that supplementation the natural clay at level 5% to layer diet contaminated with lead can prevent adverse effect of lead. | ||||
| Keywords | ||||
| layers; lead; clay; egg production; egg quality; fertility; hatchability) | ||||
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