الفهرس 
Fatty AcidsOnly 14 pages are availabe for public view
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Abstract
This study was carried out in a private commercial broiler farm in Tanta city under the supervision of Animal Production Department, Faculty of Agriculture, Tanta University, from April to June 2017 to investigate the effects of dietary linseed and soya bean oils on the growth performance, blood biochemical profiles and immune response of Ross x Ross broilers. Two hundred and twenty five one-day old unsexed Ross x Ross broiler chicks were equally divided randomly into three experimental groups with three replicates of 25 birds each. Treatment 1 basal diet without any sources of oils), treatment 2 basal diet with 3% of soya oil. Treatment 3 basal diet with 3% of linseed oil. All birds were subjected to the same managerial, hygienic and environmental conditions. The birds were grown in floor litter condition and subjected to 24 hrs. During the experimental period which extended to 5 weeks of age. Birds were fed three dietary starter diet from one day to 21 day, grower diets from 22 day to 28 day and finisher diet from 29 day to 35 day. Diets were formulated according to NRC, 1994. The house temperature was kept at about 33ºC during the first 3 days, 31ºC during next 4 days and thereafter, gradually decreased by 2-3ºC weekly down to 22- 24ºC. Pellet feed form and water was available ad libitum throughout the experimental period. The current study aimed to evaluate the effect of dietary different levels for linseed oil and soya bean oil on growth performance and some blood parameters in broilers. Diets were formulated to be isonitrogenous, isocaloric and cover or excised nutrient requirements for growing broiler chickens. All the dietary components were obtained commercially. The results indicated that:- 1- Significant differences (P≤ 0.01) were observed for broilers weight among all treatments during the experimental period for the pervious parameters. At the fourth week of age, there were a significant effect (P≤ 0.01) differences between broilers fed 3% linseed oil and broilers fed 3% soya oil compare with control. The highest value of body weight gain was laid in broilers fed 3% soya bean oil were recorded 1266.4 g and then broilers fed 3% linseed oil recorded 1226.3 g. on the other hand the lowest value of body weight gain was in broilers in control were laid 1099.4.7g 2- The highest value of body weight gain was laid in broilers fed 3% soya oil were recorded 1703 g and then broilers fed 3% linseed oil recorded 1697 g. on the other hand the lowest value of body weight gain was in broilers in control were laid 1470 g. 3- Linseed oil supplementation in diets had significant effect on feed intake. Through the whole experimental period the highest feed intake was observed in broilers fed with 3% linseed oil in the diets. 4- Feed conversion ratio was statistically affected (P ≤ 0.05) by the treatments during the whole experimental period. As a general trend the best feed conversion ratio was recorded in broilers fed with 3% soya oil and linseed oil in the diets. On the other hand the worst fed conversion ratio was recorded in broilers in control. 5- Linseed oil and soya oil supplementation in the diets had no significant effect in mortality rate compared with the control. In general the previous mortality percentage was in normal range and permitted in poultry farms.Linseed oil and soya oil in diets had no significant effect on organ lymphoid organs and carcass percentage. But broiler which fed linseed oil in the diets had a significant effect on heart, thymus and bursa percentage. The highest of carcass weight was recorded in broilers which fed soya oil in diets lining 1400 g then broilers which fed with linseed oil in the diets lining 1340g. The lowest value was noticed in control recorded 1290 g. but without significant effect in all treatments. On the other hand broilers which fed linseed oil and soya oil had a significant effect in bursa, heart and thymus percentage.