In our research we investigated the influence of physical loading to erythroform change in the periferic blood of 30 days rabbit puppies suffered hypoxia in the prefetus period of prenatal development. In normal and prefetus period of prenatal development, in the blood of 30 days rabbit puppies borned by mothers suffered hypoxia rising appeared in some erythroform indicators, in others, reducing appeared after the influence of physical loading.(table 1, figure 1,2) So, the cause of noticable changes in erythroform indicators of rabbit puppies suffered hypoxia after physical loads influence is appearing of disorder in neuro-endocrine regulation of the blood in the result of hypoxia.