EFFICIENCY OF USING OIL AND DRY FAT THROUGH DIFFERENT FEEDING SYSTEMS ON THE PERFORMANCE OF BROILER CHICKS.

By

El-Neney, Battaa. A. M.; A. S. Abd El-Hakim

Anim. Prod. Inst., A R C, Ministry of Agriculture

Abstract: A nine- treatments experiment was carried out to study the response of broilers to dietary fat sources being vegetable oil (mixture of palm oil, sunflower oil and soybean oil) and dry fat (the calcium salt of previous vegetable oils) each at the rate of 3%, compared to the control without oil or fat. The experiment diets were fed to a total of 270, 7- days' old Arbor Acres broiler chicks through three feeding systems being ad lib, two meals and three meals per day in a 3 x 3 factorial design up to 49 days of age. Growth performance, carcass traits, meat chemical composition, liver content of lipids, protein and glycogen and some blood constituents were evaluated.

The main results could be summarized as follows:

 Highly significant differences in the final body weight, feed intake and liver glycogen were observed between the different feeding systems. While for body weight gain at (5-7 and 1-7 wks), feed conversion and AST, activity in blood serum, the differences were significant. Final body weight, feed intake (5-7wks),feed conversion, abdominal fat, liver (lipids and protein), and serum content of total cholesterol, triglycerides and AST were significantly differed between feed fat sources and highly significant differences were appeared between fat sources for body weight gain and feed intake (1-7wks). At 7weeks of age, broilers fed three meals per day (oil or dry fat) had significantly higher body weight than those either fed ad lib or two meals per day. Also, the broilers of feeding three meals (dry fat) showed significantly higher body weight gain than those of ad lib and two meals (oil or dry fat).The improvement in growth performance, was more pronounced by using dry fat than oil and by using restricted feed. Using feed restriction without or with dry fat or oil decreased the abdominal fat percentage. Broilers fed three meals (oil or dry fat) per day had significantly heavier dressing percentage compared to those either fed two meals per day or ad lib. The study indicated that using dry fat with restriction feeding regimens are the most beneficial feeding system for growth performance of broilers and decreased mortality rats, compared with ad lib per birds. Also, feed restriction significantly improved feed conversion and decreased carcass fat.