Fatty acid composition of tissue lipsds goslings and goose embryons

The changes in the fatty acid composition of the lipid in the brain tissues and geese liver and their
embryos from 22-th embryonic day until 14-th day of postnatal period have been investigated. The fatty acid
composition of tissues was quantified by methods of gas-liquid chromatography. The index of fatty acids
unsaturation was calculated as equivalent concentration of unsaturated fatty acids relative to double bonds.
Experience has shown that in the brain of geese high content of unsaturated fatty acids and level of their
unsaturation occurs in 22-day-old embryos. From the 22nd to 28th day of embryogenesis the total content of
unsaturated fatty acids in the brain tissues of embryos has decreased by 37.3 %, and the level of
unsaturation of fatty acids — by 44.4 %. The transition to postnatal development (from the 28th day of
embryogenesis to 1 st day of postnatal period) was characterized by a stable content of unsaturated fatty
acids in the brain. However, the degree of unsaturation of fatty acids has decreased by 8.0 %. The content of
unsaturated fatty acids in the liver of 22-days embryos compared with the brain tissues was higher by
13.9 %, while the level of unsaturation fatty acids in the liver, as compared with the brain was lower by
17.8 %. From the 22nd day of embryogenesis to the 1st day of postnatal development gradual increase in the
content of unsaturated fatty acids in the liver was traced, while the level of their unsaturation in this period
remained unchanged.
A high content of unsaturated fatty acids was found in the liver of 1 day-old goslings, which is
15.8 % higher than the corresponding figure 22 day-old embryos. The first week of postnatal development
was characterized by decrease in the content of unsaturated fatty acids in the liver by 25.0 %, and their level
of unsaturation — by 21.62 %. The study results showed that one of the mechanisms of prooxidant-
antioxidant balance support within the transition from of embryogenesis to postnatal development is to
reduce the unsaturation of lipid fatty acids. This mechanism is realized in the brain of geese from hatching
eggs of different quality. The support prooxidant-antioxidant balance in the liver by means of reducing the
unsaturation of fatty acids is less effective and is mostly defined by fatty acid composition of lipids of geese
hatching eggs.