The effect of different doses of "Butofan OR" on the dynamics of embryogenesis of incubation eggs

The article presents the results of the use of the drug “Butofan OR” in various dosages for transovarial treatment of hatching eggs and stimulation of embryogenesis in chickens of the highly productive meat cross “Cobb 500”. Despite the fact that in general the mechanisms of embryogenesis have been studied, there remains an open question about the effect of various drugs on the process of embryo development under the influence of paratypic factors. In particular, effective methods of using the drug “Butofan OR” for transovarial treatment of hatching eggs of parent flock chickens and stimulation of further development of young animals at different stages of ontogenesis have not yet been studied. The purpose of the work is to determine the effectiveness of using different doses of the drug “Butofan OR” during transovarial processing of eggs. “Butofan OR” in 1 ml contains butaphosphan – 100 mg and cyanocobalamin – 0.050 mg as active ingredients; excipients: methyl 4-hydroxybenzoate – 0.7-1.3 mg, purified water – up to 1 ml. The drug was specified in the following concentrations of the working solution: 01%, etc. It was found that when using the drug in experimental groups, the duration of withdrawal was reduced by 2 -4 hours. During pre-incubation treatment of eggs in all experimental groups, it was found that, taking into account incubation waste, hatchability increased by 5.14% and 6.71%, and hatchability by 7.03% and 7.82%. When assessing chickens at one day of age, it was found that in the 2nd experimental group, according to the set of indicators of the quality criterion of the “Pasgar” scale, the average score was 8.7, and according to the quality criteria of the “Optistart” scale, the average score was 9.2. The best performance was observed when processing hatching eggs in concentrations of 0.5% before placing them in the incubator and 5.0% on the 18.5th day of egg incubation. Transovarial treatment of hatching eggs had a positive effect on the viability and dynamics of live weight of hatched young animals. At the end of the technological growing period, the live weight of the chickens exceeded the results of the control analogues - by 6.91% (P <0.001) with the safety of the livestock - 99.0%. 

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