Abstract
The influence of the level of estradiol in the blood serum on the concentration of vitellogenin in Pushkin chickens at the end of the ovulatory cycle was studied. The results of the experiment show that in the studied chickens, the peak concentration of estradiol falls on the time interval between 7,5 and 2,5 h before egg laying (221,3±14,5 – 230,6±16,4 pg/ml, p<0,05) with subsequent its decrease (167,4±15,6 pg/ml). High correlation between the concentrations of estradiol and vitellogenin in the periods 9 h 00 min – 7 h 30 min and 2 h 29 min – 0 h 15 min before egg laying (r = +0,94 …+0,98, p<0,001), and also a significant relationship of estradiol with the weight of the yolk (r = +0,50 …+0,72), indicate that in these periods, the concentration of estradiol can predict the content of vitellogenin in the blood of chickens and the weight of the egg yolk. Accordingly, the concentration of estradiol can be used as a criterion for the selection of chickens on the basis of yolk size.
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