الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 148 |  |  |
| | | from | 148 | | |
Abstract
Sixty Hisex brown pullets of 18 weeks old were used for this investigation •. The ens were divided into six groups. Five groups, in addition to control, varied with respect to maturi ty. egg laying. And aging. Group I : Compar i s ed , ten immature female hens not come • into laying. of _19 weeks age. were used as control. Group II: It was contaiaed ten mature hens which commenced to lay. of .22 weeks age Blood samples were taken in the first day of laying. Group III: Included ten mature females hens of .23 weeks aqe , Blood samples were collected at the tenth days of lay. Group IV : Ten mature female hens of 25 weeks of age •. Blood samples were collected at the twentieth day of egg laying . Group V: _27 weeks age’
fortieth day of Comprised, ten mature female hens of Blood samples were collected at the
egg .posi tioning. Group VI: Consisted of ten mature female laying hens of 30 weeks age. Blood samples were driven when hens reached the sixtieth day of egg production. Serum samples were
constituents Total esterified fatty acids as total cholesterol. analysed for the following lipids, triglycerides, non free fatty acids as well The obtained results &ummarize the~follbwing:
1- There was a highly significant increase in serum total lipids, triglycerides as well as phospholipids
Non esterified fatty acids showed a non significant increase The total cholesterol showed a non significant decrease at the first onset day of laying in comparison with control values were noticed. 2- At the tenth day of laying, the obtained results indicated a highly significant increase in both total lipids and phospholipids, but there was a significant increase in serum triglycerides, whe r eas , the total serum cholesterol and non esterified fatty acids revealed a non significant increase. 3- There was a significant increase in serum total lipids and phosph.olipids, although triglycerides level showed non significant increase in addition to the non esterified fatty acids. But there was a non significant decrease in total serum cholesterol at the twentieth day of egg positioning. 4- At the fortieth day of laying the obtained results showed a non significant increase of total serum cholesterol, and the non esterified fatty acids, where as there was a highly significant increase of serum total lipids, phospholipids as well as triglycerides if compared with resul ts given by
the control hens. 5- There was, a highly sigificant increase of serum total lipids and phospholipds, but the triglycerids
and non esterified fatty acids showed a significant increase only, where as total cholesterol level in the serum showed a highly the sixtieth day of egg with the control values. significant decrease at production as compared from the obtained data it can be concluded that there was, mostly, an increase in all lipid fractions production periods, especially
hens. Furthermore, because of during different egg in heavey producing the facts that there components in the ovary
is no synthesis of lipid or in the ovum, and the complete dependence of egg yolk fat upon blood lipid; the mature female hen recieves its required lipids from different lipid components of food. Accordingly. the author recommends a supply of good and adequate amounts of lipids to laying hens. while they are in the egg fomation cycle, in order to obtain a maximum yield of egg productivity.