Study on the effect of consumption period of fish oil on serum concentration of cholesterol and triglyceride and antibody response in broiler chicks
Subject Areas : Veterinary Clinical Pathology
حسین Iravani
1
(Department of Animal Science, Baft Branch, Islamic Azad University, Baft, Iran)
M.A Karimi Torshizi
2
(Department of Poultry Science, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran)
بابک Khierkhah
3
(Department of Poultry Science, Faculty of Agriculture, Tarbiat Modares University, Tehran, Iran)
Keywords: Broiler, fish oil, antibody response, Omega-3 fatty acid, Length of consumption,
Abstract :
The aim of the present study was to determine the optimal time of fish oil inclusion in broiler feed formulation on antibody response and concentration of serum cholesterol and triglyceride. A 49 day study was conducted on 600 one-day old chicks from a commercial hybrid (Ross) which were randomly allocated to 6 groups. The control group was fed a diet containing 5 % corn oil and in experimental groups the fish oil was substituted for corn oil from 2,3,4,5 and 6 weeks. Serum concentration of cholesterol and triglyceride were determined on days 37 and 44. Titer of antibody against sheep red blood cells (SRBC) were determined 7 days after immunization on days 30 and 37. Supplementation of diet by fish oil did not affect concentration of serum cholesterol. However, concentration of serum triglyceride decreased significantly (p<0.01). Titer of IgG against SRBC was affected in first injection (p<0.01) and the maximum antibody response was seen in control group and chickens feeding fish oil for 2 weeks, and antibody response decreased with increase of consumption length of fish oil. Titer of IgM in the second injection (p<0.05) were affected by dietary treatments. Chickens which were fed fish oil for 2, 3 and 4 weeks had higher antibody response than other treatments.