Содержание липидов в яйце при добавлении в рацион кур-несушек кислото- и водорастворимого хитозана

Abstract

The studies were carried out on laying hens of the Ptichnaya cross at the age of 19 weeks. with an initial live weight of 1,67 kg for 1,5 months, who were given a complete mixed feed (recipe No. KK 1-58-59576, (OJSC Istra-Hleboprodukt) at 135 g/bird/day. The hens were divided into 4 groups: the 1st was the control group received BR without additives, the 2nd and 3rd received BR + acid-soluble chitosan (ASC) at 10 and 20 mg/kg of live weight, respectively, the 4th received BR + 20 mg kg/l of live weight of water-soluble chitosan succinate (WSCC). Inclusion in the diet of laying hens of both forms had practically no effect on the content of total lipids in the yolk. In the eggs of group 2 hens, the content of total lipids in relation to the control at the age of 30 weeks was higher by 10,3 %, at 52 weeks it was lower by 3 %, and at 65 weeks it was lower by 0,76 %. In the eggs of hens of the 3rd group, the content of lipids at the age of 30 weeks was higher than in the control samples of eggs by 12,8 %, at 52 weeks by 1,2 %, and 65 weeks no differences were found. WSCC had no effect on the content of phospholipids, and ASC increased their concentration (depending on the dose). At a lower dose, an increase in the level of phospholipids in the yolk in the 1,8 times. In the eggs of hens of the 2nd group, the concentration of phospholipids was higher than in the control ones at the age of 30 weeks. by 85 %, at 52 weeks by 51,6 %, and at 65 weeks by 50%. In the eggs of hens of group 3, the concentration of phospholipids was higher compared to the data of eggs of hens of the control group at the age of 30 weeks. by 36,5 %, at 52 weeks. by 8 % and 65 weeks – by 9,6 %. The introduction of ASC at a dose of 10 mg/kg of live weight into the diet of chickens was accompanied by a decrease in cholesterol content by 1,5 times, and WSCC at a dose of 20 mg – by 2 times. The content of polyunsaturated fatty acids in the eggs of laying hens between the control and experimental groups did not have significant differences and their values are within the established norms. When ASC was included in the diet of laying hens at a dosage of 20 mg/kg of live weight, a 15 % decrease in the amount of polyunsaturated fatty acids was observed, with an increase in the content of fatty acids of the ω-3 family in the whole egg by 24 %.