Crude Sunflower Oil

In this experiment, the effects of different levels of fish oil and poultry fat (FP + FOR) on the yield and composition of fatty acids in broiler chickens assessed. 3% oil in the four schemes have been modified by replacing FP FP (FP = 3% T1, T2 = 2% 1% for PF T3 = 1% to 2% PF-T4 = 3% for) and had ad libitum to the birds during the period of growth. Performance was calculated at 42 d of Age and fatty acid profiles were determined after removal of FP Food (for one week) prior to slaughter in the 49-d old. Higher body weight, weight gain and decreased feed conversion ratio (FCR) were recorded for birds T3 (1% to 2% PF). For high concentrations (2 levels and 3%) decreased the saturation (SAT) and monounsaturated FA content (MUFA) and polyunsaturated fatty acids increased the content (PUFA), mainly in the form of linolenic acid and long chain n- 3 FA (C22: 6n-3, C22: 5n-3, C20: 5n-3) in samples of breast. By replacing the FOR diet with experimental mixture (T2 and T3) and 3% to food (T4), n-3 and n-6 FA contents increased. However, increasing the amount of n-3 FA compared to n-6 FA content was doubled in the tissue studied. Therefore, the n-6: n-3 was reduced to be the optimal ratio.

INTRODUCTION
The long chain omega-3 polyunsaturated fatty acids (LC n-3 PUFA) have long been recognized as an important factor in food animals. In humans and animals in intensive farming, it appears that systems become unbalanced in terms of fat composition in particular polyunsaturated fatty acids. The content of omega-3 (n-3) fatty acids decreased and that of omega-6 (n -6) fatty acids has increased. By supplementing with fish lipids are rich in LC n-3 PUFA, the balance can be restored (Bezard et al, 1994; Tonci et al, 1987; Manila et al, 1999 and Lopez Ferrer et al, 2001).

The fish oil source of n-3 fatty acids are provided in the form of alpha linolenic acid (C18: 3 n-3, LNA), eicosapentaenoic acid (C20: 5 n-3, EPA) and acid docosahexaenoic (C22: 6 n-3, DHA) and poultry fat contain the n-6 fatty acids mainly linoleic acid (C18: 2 acid n-6, LA) and arachidonic (C20: 4 n-6, AA). With use of fish oil will be provided optimal ratio of n-6: n-3 in the diet and increasing the efficiency of linolenic acid. Several studies with a diet rich in LNA have no control of n-3 and n-6 content in tissues of chicken FA (Ajuyah et al, 1993, Scaife et al 1994 and Lopez Ferrer et al 1991). The use of fish oil (the main source of LC n-3 PUFA) is limited due to constraints of smell in the final product (Hargis and Van Elswyk, 1993).

Thus, this study has been conducted to assess the effect of using a composition of oil / fat substitute for PF Tobe to assess the effect on broiler carcass fatty acid composition and determine the optimal level of dietary fat to ensure EPA and DHA and reduced amounts of n-6: n-3 chicken. Their effect on performance was also evaluated.

MATERIALS AND METHODS

Fish oil supplied with the collaborator MEHREGANE Khazar (Bandar Abbas) and poultry fat company purchased SEFIDAN MORGE TABRIZ unit industrial logging. The oil stored in the station dark at 40 ° C until the mixture to food.

A total of five unsexed handered a d-Ross chicks were obtained from a commercial hatchery (hatchery SAMIN Co., MARAGEH). The chicks were fed a common basal broiler starter of 1-20 days (up period). At 21d, 160 male chickens were sexed and randomly resigned in cages of 1 a— 1 a— 0 / 8 meter (10 per cage) and the experimental diet [diet containing 3% PF (T1), 2% 1% for PF (T2), 1% 2% for PF (T3) and 3% (T4)] throughout a period of 21-d growth. The experimental diets formulated isonitrogenouse Tobe (19 / 5% CPR) and isoenergetic (3136 kcal / kg ME) in accordance with the recommendations of 1994.