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Effect of dietary fatty acids on serum parameters,fatty acid compositions,and liver histology in Shaoxing laying ducks

Wei-meng LIU 1,2,Shu-jing LAI 2,Li-zhi LU 1,Fang-xiong SHI 2,Jing ZHANG 1,3,Yu LIU 4,Bo YU 5,Zheng-rong TAO 1,Jun-da SHEN 1,Guo-qin LI 1,De-qian WANG 1,Jin-jun LI 1,Yong TIAN 1(1 Institute of Animal Husbandry and Veterinary Science,Zhejiang Academy of Agricultural Sciences,Hangzhou 310021,China)(2 College of Animal Science and Technology,Nanjing Agricultural University,Nanjing 210095,China)(3 Luozhuang Bureau of Animal Husbandry and Veterinary Medicine,Linyi 276022,China)(4 School of Optometry and Ophthalmology,Wenzhou Medical College,Wenzhou 32500,China)(5 Ningbo Jiangnan Poultry Breeding Limited Company,Ningbo 315200,China)  
The effects of different fatty acid(FA) contents in diet on serum parameters,FA compositions of eggs and meat,and liver morphological changes were studied in Shaoxing laying ducks.A total of 264 ducks at 17 weeks were fed a control diet or a diet containing 30 g/kg fish oil(FO),25 g/kg sunflower oil(SO),or 30 g/kg palm oil with 20 g/kg beef tallow(PBO).Malondialdehyde(MDA) content in the liver and the serum of ducks fed the PBO diet was significantly(P0.05) higher than that of ducks fed the other diets.Triglyceride(TG) and total cholesterol(TC) levels were significantly lower(P0.05) in ducks fed the FO diet.Serum TC also was lower in ducks fed the SO diet.Superoxide dismutase(SOD) activity was also affected by diets.The contents of polyunsaturated FAs(PUFAs) in eggs and meat were significantly higher(P0.001) in ducks fed the FO and SO diets than in ducks fed the control diet.The level of C22:6(n-3) FA in ducks fed the FO diet was significantly higher than that in ducks fed the other diets.However,the conversion efficiency of the longer-chain C20:5(n-3) FA was higher than that of C22:6(n-3).Ducks fed the PBO diet exhibited lipid droplet accumulation in the liver.These results demonstrate that a diet enriched with different FAs has strong effects on serum lipid levels and the deposition of PUFAs into tissue lipids.
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