[Causes of disorders affecting the hatching and viability of broiler chicks].

Studies were carried out on the hatchability and broiler-bird viability in dependence on meeting the needs of parental birds of vitamins A and E. The experiments were carried out under productive conditions with material taken from four poultry farms. The forage mixtures intended for parental birds were sampled with regard to studying the content of carotene, vitamins A and E, fats, aldehydes, protein calcium, and phosphorus. The same content was followed up also with establishing the biologic activity of vitamin E in breeding eggs of layers at different age. A correlation was established between vitamin A and vitamin E in the forage mixtures for the parental birds and the hatchability and viability of the broilers. Thus, at values for A and E vitamins 6970 UI, resp. 3772 UI hatchability dropped by 1,7 per cent and the number of birds of low viability rose by 3,16 per cent, which was associated with the deficient amounts of carotenoids, and A and E vitamins in the eggs for breeding.