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Baranyiova E., S. Standara: Effect of Food Intake, Fasting, Deutectomy and Environmental Temperature on Saturated and Umaturated Fatty Acid Distribution in the Blood Plasma of Cockerel! in the First Week after Hatching. Acta vet. Brno, 50, 1981: 43-47. The effect of food intake, fasting; ambient temperatures of 18°C and 35 °C and deutectomy on the distribution of saturated and unsaturated fatty acids in the blood plasma of cockerels was investigated in 200 birds aged 1 to 5 days. Total plasma fatty acids were determined by gas chromatography. In newly hatched cockerels the quantitatively most important (C14 C,o) saturated fatty acids accounted for 68.2 ± 4.2 % and unsaturated acids for 27.1 ± ± 4.7 % of total fatty acids. This distribution changed considerably within the first week after hatching in that the saturation of fatty acids decreased at a rate obviously dependent on the onset of food intake: it started to change later in fasted than in fed birds. Environmental temperature and deutectomy did not affect these changes. Fatty acids (C14 Coo), age-dependent changes, saturation. Fatty acids serve mainly as an energy source to the body. Small amounts of fatty acids (FA) are used in addition for other purposes such as membrane formation or prostaglandin synthesis (Lindsay 1975). Data on their role in lipid metabolism of birds are rather scarce; their contribution to egg lipids of the domestic fowl and other avian species were studied e. g. by Christie and Moore (1972). The bulk of fatty acids in body fats of various migrating avian species was found to consist of oleic (36 %) and palmitic (21 %) acids (Caldwell 1973). In depot fats of adult fowls 69 % unsaturated and 31 % saturated fatty acids was found (Feigenbaum and Fisher 1959). There are no data, however, on the effects of age, fasting, and various ambient temperatures on the distribution of saturated and unsaturated fatty acids in the blood plasma of chickens. We therefore investigated this distribution in newly hatched cockerels and followed its development with age in fed and fasted birds and the effects of deutectomy and two ambient temperatures. Materials and Methods In the experiment 200 newly hatched Shaver Starcross cockerels were employed. The birds were kept and treated as previously described (Baranyiova, Standara 1980). Five birds each of all experimental groups were blood-sampl~d invariably at the same time of the day after minimum handling on days 1, 2, 3, 4 and 5. The blood plasma samples for determination

acta veterinaria brno

Effect of Food Intake, Fasting, Deutectomy and Environmental Temperature on Saturated and Unsaturated Fatty Acid Distribution in the Blood Plasma of Cockerels in the First Week after Hatching