Morphometric changes in parameters of eyeballs and crystalline lens in chicken embryos of the cross "lomann brown"

The article presents morphometric studies of eyeballs and crystalline lens of chicken embryos from the 4th to the 20th day of incubation in rostro-caudal and dorsoventral directions. At early stages of development, slight differences in the diameters of the right and left eyeballs were observed, which gradually decreased, reaching synchronous development by the end of incubation. In the rostro-caudal direction, the size of the right eyeball exceeded the left one by 25% on the 4th day, decreasing to 1.9% by the 20th day. Significant differences were observed on the 16th and 19th day (p<0.05...0.01). In the dorsoventral direction, the difference between the right and left eyeballs was 9.4% on the 6th day, stabilizing at 1.8-1.9% by the 18th-20th day. Significant differences were noted on the 6th (p<0.05) and 18th-20th (p<0.01) days. The lens size in the rostrocaudal direction showed a maximum deviation of 33.3% on the 4th day and a minimum of 5.9% on the 20th day. Significant differences between the right and left lens were found only on the 9th day (p<0.01), 18-19th day (p<0.01) of incubation in the dorsoventral direction the difference between the right and left lens ranged from 7.7% to 25.0% in the early stages (4-9 days), decreasing to 4.2% by the 20th day. No significant differences were found. The studies showed that the sizes of the eyeballs and crystalline lens increased in a regular manner during the incubation period, with the right eye and crystalline lens being slightly larger than the left throughout the developmental period. The size of the lens increased in proportion to the growth of the eyeballs. We noted intensive growth during the transition to the early fruiting stage of development.