For citations:
Lebedeva I.Yu., Smekalova A.A., Montvila E.K., Aleinikova O.V. Effect of age on the secretory activity of different layers of preovulatory follicles in laying hens. Genetics and breeding of animals. 2020;(4):28-32. (In Russ.) https://doi.org/10.31043/2410-2733-2020-4-28-32