Abstract
The current study was designed to determine the effects of dietary docosahexaenoic acid (DHA) on fatty acid deposition in egg yolk and various tissues of laying Tsaiya ducks, and on the mRNA concentrations of hepatic lipogenesis-related transcription factors. Thirty laying ducks were randomly assigned to three treatments with diets based on corn-soybean meal (ME: 2803 kcal/kg; CP: 17.1%; Ca: 3.4%) supplemented with 0% (control diet), 0.5% or 2% algal DHA oil. The DHA content in egg yolks of the ducks was elevated significantly (p 0.05). The DHA concentration in plasma, liver, and skeletal muscle was increased with the addition of dietary algal DHA oil (p<0.05). The mRNA abundance of sterol regulatory element binding protein 1 (SREBP1) and SREBP2 in the livers of laying Tsaiya ducks was not affected by dietary DHA, suggesting that the expression of these transcription factors is tightly controlled and not sensitive to DHA treatments.
Highlights
Dietary fatty acids (FA) are essential to maintain normal physiological functions and can be incorporated into different tissues of animals
Dietary docosahexaenoic acid (DHA) did not change the expression of liver lipogenesis-related transcription factors (SREBP1 and SREBP2), suggesting fatty acid and
Unsaturated FA concentrations in egg yolks are altered by dietary unsaturated FA in avian species (Cruickshank, 1934; Chen et al, 1965; Navarro et al, 1972)
Summary
Dietary fatty acids (FA) are essential to maintain normal physiological functions and can be incorporated into different tissues of animals. Changes in FA composition of liver, muscle and adipose tissue are achieved by feeding different dietary FA sources (Innis et al, 1996; Smith et al, 1996; Ding et al, 2003). Dietary FA can be deposited into egg yolks and into other tissues (Cruickshank, 1934; Donaldson, 1967; Ding and Lilburn, 1997). Feeding hens with fish oil increases n-3 polyunsaturated fatty acid (PUFA) levels in the egg yolk lipids, indicating that the FA composition of egg yolks can be changed by dietary fat sources We enriched egg-yolk, plasma, liver, and skeletal muscle DHA through dietary supplementation with algal DHA oil. Dietary DHA did not change the expression of liver lipogenesis-related transcription factors (SREBP1 and SREBP2), suggesting fatty acid and. Cholesterol synthesis, important for egg-yolk production are not regulated by dietary DHA in laying ducks
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