Effect of the photoperiod of red led lighting during incubation on the growth, hematological and physiological parameters of chicken embryos of Lohmann Brown cross

The effect of various photoperiod modes of red LED lighting on eggs under incubation on the growth, development of visceral organs, hematological profile of blood, stress level, metabolism, chicken embryos and results of incubation of egg of Lohmann Brown cross has bee studied. On the 21^st day, with a 24-hour light mode, embryos showed an increase in body length and weight, muscle stomach, liver and spleen, and at 18- and 12-hour mode – body weight, muscle stomach, liver and spleen. In the absence of light and 12-hour light mode, embryos showed lymphocytopenia and neutrophilia, and increased stress levels. At the 24- and 18 hours modes, the intensity of respiration and level of basal metabolism in embryos on the 21st day increased compared to developing embryos in the absence of light and with 12-hour light impact. The 24- and 18-hour modes were superior in terms of number of chickens bred compared to control and 12-hour lighting mode. The hatching under prolonged light was significantly higher than in absence of light and under 12-hour illumination by 1.99–2.33 p.p. and 4.99– 5.33 %, and hatchability – by 2.16–3.32 p.p. and 3.68–4.84 %. The highest embryonic viability during 19–21 days was detected with round-the–clock lighting, and the highest fetal death was detected with 12-hour lighting. Thus, in the practice of incubation of eggs of the Lohmann Brown cross, it is advisable to use continuous red LED lighting, which contributes to intensive development of chicken embryos and visceral organs (muscle stomach, liver and spleen), stress resistance, optimization of metabolism, increased hatching and hatchability.

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