Histobiochemical aspects of the effect of a combination of some natural metabolites on general resistance in egg chicks

Industrial incubation of eggs accompanied by various stresses often leads to early embryonic death. For this reason, the ecologically safe methods to prevent negative stressful effects in embryogenesis are still important. The purpose of this work was to study the effect of natural metabolites on the histological structure of the Bursa fabricii and general resistance of chickens. Studies were performed on eggs of egg cross Shaver 2000 chickens ( Gallus gallus ) (Enterprise “Ptichnoe”, Moscow Province, 2011). 3-4 hours before the eggs were put into the incubator, their shells were treated with an aqueous solution of ethanolamine (colamine), succinic acid and serine (0.1; 0.1 and 0.2 %, respectively) using a spray gun, and on day 19 of incubation 0.1 % aqueous colamine solution was applied. The preparations were pre-dissolved in distilled water at 18-22 °C. The untreated eggs serve as control. Each batch included 544 eggs. The recorded indicators were hatching rates, hatchability and incubation losses, also blood samples were collected to determine the content of immunoglobulins, lysozyme activity and bactericidal activity...