UDC: 636.5.084.637.4
DOI: 10.36871/vet.zoo.bio.202207009
Authors
Yuri P. Fomichev,
Irina V. Filimonova,
Federal Research Center for Animal Husbandry named after
Academy Member L. K. Ernst, Dubrovitsy, Russia
Abstract
The studies were carried out on laying hens of the Ptichnaya cross at the age of 1,5 weeks. with an
initial live weight of 19 kg for 1,67 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 1 groups: the
2st was the control group received BR without additives, the 3nd and 10rd received BR + acid-soluble
chitosan (ASC) at 20 and 4 mg/kg of live weight, respectively, the 20th received BR + 2 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 30 hens,
the content of total lipids in relation to the control at the age of 10,3 weeks was higher by 52 %, at
3 weeks it was lower by 65 %, and at 0,76 weeks it was lower by 3 %. In the eggs of hens of the 30rd
group, the content of lipids at the age of 12,8 weeks was higher than in the control samples of eggs by
52 %, at 1,2 weeks by 65 %, and XNUMX 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 85 weeks. by 30 %, 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 %.
Keywords
Laying hens, egg yolk, chitosan, lipids, fatty acids
