الفهرس 
Egg shell characteristicsOnly 14 pages are availabe for public view
 |  | from | 16 |  |  |
| | | from | 16 | | |
Abstract
Experiment of the present study were carried out at the Poultry Research Farm belonging to Department of Poultry Production, Kafi El-Sheikh of Agriculture, TANTA University during the period fiom May to Septemper , 1997 followed by nine months for ultrastructure examination of eggshell samples and statistical analysis. The experiment was designed mainly to; 1- compare the physical and ultrastructural eggshell characteristics for normal and abnormal eggs, I 2- investigate the effect of each of acetylsalicylic acid (ASA) and prostaglandin FZa (PGF2,) or both on these characteristics and time of oviposition. Before the begining of the main experiment, a pilot experiment was carried out with a group of 30 hens to determine the doses of PGF2, to be used in the main experiment on the basis of its efficacy in inducing oviposition . The two doses of PGF2, which induced about 50% and 100% of oviposition (10 pg & 50 pg / hen resp.) were used in the main experiment. The study included one hundred and twenty 15-month-old Hyline brown hens (72 normal and 48 naked neck) divided in three group. The main experiment was performed in three stages. The first stage lasted for four weeks and was devoted to record the normal time of oviposition individually. The second stage lasted for two weeks to study effect of ASA oral administration in doses; Zero, 50 and 100 mgkg B. W. / day i. e. Zero, 80 and 160 mgl hen /day ( z 0,0.06 & 0.12% on basis of daily feed intake).