اثرات دو روش بيولوژيكي خوراك دهي بر مقدار انرژي قابل سوخت و ساز چربي طيور و روغن ماهي با استفاده از خروس بالغ

Comparison of two procedures on the metabolizable energy values of poultry fat and fish oil with adult cockerels

An experiment was performed to study the comparison of two procedures on the metabolizable energy values of poultry fat and fish oil. Thirty-two adult cockerels (Rhode Island Red) were used in bioassay under standard condition. In the first procedure (precision feeding) the birds not fed for 24 h and then basal diet included fish oil and poultry fat at 5 and 10 percent were fed. in second procedure each birds was given a 3-d adaptation period fasted for 24 h and then given feed "(conventional addition method: CAM) to the same rations as those used in the first experiment. During the 3 d of the experimental period, dropping were collected and frozen for gross energy. The results of experiment showed that mean ME values of basal diet included 5 and 10 percent fish oil by the precision - feeding procedure were significantly increasing. It was concluded that methods of feeding were influence ME of fish oil and poultry fat at 5 and 10 percents except AMEn value obtained of both procedures. The result of this experiment proved mean AMEn value of poultry fat and fish oil were 5.37 ± 0.08 and 8.85 ± 0.07 kcal/g respectively.