EN
The subject of study concerned the relationship between the acid base balance /ABB/ in cows during the last period of pregnancy and the milk yield, some fertilization indexes as well as performances monitored in calves born from healthy cows, and from those with ABB disorders. The results revealed, that in 45.95 % of cows underwent the experimental trials, chronic, compensate respiratory acidosis was diagnosed. Animals from that group were characterized by lower milk production about 20.00 %, lower milk fat contents about 23.01 % and also insemination index length of time about the value of 0.33. In calves from cows with ABB disorders, unbalanced respiratory acidosis remained length of time after birth, and daily gain was lower about the value of 22.20 %, when compared with these calves born from healthy cows.