Skin temperature changes of the cow mammary gland and the heat flux from its surface before and after milking.

The studies were aimed at determining the udder skin temperature and heat flux from its surface 30 min before and 20 min after milking. It was carried out on 8 cows in 3-4 week of lactation, kept in a tying stall. After milking the udder skin temperature increased (0.

[The effect of technopathologically limited stress factors on the fertility of cattle].

The influence of purulent claw-diseases on the development of uterus infections, its involution and ovary dysfunctions (acyclia, cysts) was examined. It was shown that A. pyogenes, Ps.

[Buffer systems, electrolytes, pH and erythrocyte indices in the blood of cows and calves in the perinatal period].

Determinations of pH, buffer systems, electrolyte levels and erythrocyte indices were carried out in the blood taken from the external cervical vein, arterial and venous vessels of the cow uterus and the umbilical cord of 9 healthy cows and their progeny, in the pre- and postnatal period. In this period the levels of the determined biochemical indices did not undergo any significant variations in the cows. The animals showed a normal acid-basic equilibrium.

[Effect of stress on uterine contraction in cows].

The investigation was carried out to observe the influence of stress upon the motility of the uterus from 1st to 5th day after parturition or cesarotomy. The experiments involved 24 lowland black and white cows; in 12 of them cesarean section was performed. The motility of the uterus was recorded with the balloon method by way of air transmission.