Comparative characteristics of morphometric indicators of growth and development of egg-type chicken embryos at different stages of embryogenesis

Abstract

The article presents a comparative analysis of morphometric parameters of growth and development of chicken embryos from hybrid poultry egg productivity at different stages of embryogenesis. In the embryos of Loman Brown, compared with Haysex Brown, there was a statistically significant increase in absolute values of length and body weight at all stages of embryonic development. In late-fetal stage length and weight body of embryos, Lohmann Brown was more on 0,339 cm (P<0,001) and 0,167 g (P<0,01), in early-fetal stage - on 0,713 cm (P<0,01) and 1,282 g (P<0,01), in mid-fetal stage - on 0,673 cm (P<0,001) and 4,226 g (P<0,001), in late-fetal stage - on 0,245 cm (P<0,001) and 6,437 g (P<0,05), respectively. By the late-fetal stage of development, the specific growth rate of length and mass in chicken embryos of both crosses decreased. The specific rate of body length is statistically significantly higher by 0.099% (P<0,05) in the mid-fetal stage and by 0.171% (P<0,001) in the late-fetal stage of Haysex Brown embryos. Specific body mass sizes in the late-fetal stage of cross Haysex Brown embryos are 3.356% larger (P<0,01) than in Loman Brown embryos. At all stages of embryogenesis, the growth rate of the body length of the Haysex Brown and Loman Brown embryos is characterized by negative allometry. Slower growth in length relative to body weight in the late embryonic stage is observed in the embryos of Haysex Brown (b=0,500). In subsequent stages of development, chicken embryos of two different crosses show the same negative allometric growth in body mass length relative to their weight.