[Clinical and morphological changes in the hoof sole of large ruminants with inflammatory diseases].

Clinical, morphological, and histomorphological investigations were carried out of the changes taking place in the solar matrix in some more common diseases in cows raised in the conditions on the enlarged farms of industrial cattle breeding. With the traumatic aseptic inflammations of the solar matrix the nova and its effect predetermine histologically the various degrees of changes, consisting in circulation disturbances, oedema of the connective tissue, disintegration of the connective tissue bundles, divergence of the collagen fibres, mucinous dystrophy, fibrinoid-necrotic foci, and heterophilic infiltration around the blood vessels and in their wall (arteriitis and periarteriitis). In suppurative inflammations of the solar matrix the process assumes diffuse character with strongly manifested leukocytic infiltration, with the development of dystrophic necrobiotic processes.

[Effect of laser acupuncture and irradiation of the cervix uteri in cows on cardiac activity and morphological composition of the blood].

Tested is the action of helium-neon laser for acupuncture with capacity 7mV and diameter of the ray 2 mm in cows during the puerperal period. Laser acupuncture (LA) is applied on 6 cows by radiation of two main acupuncture points 49 and 50 for 2 min and additional--27, 28 and 29, radiated for 1 min each of them. Second group is locally radiated in area of the cervix of the uterus (LRCU) for 6 min.

[Changes in the T-wave configuration in the ECG telemetry of cows].

Radiotelemetric and biochemical investigations were carried out with a total of 40 freshly calved cows, divided into two groups in dependence on the form of the T wave of ECG. It was found that the biphase T wave spoke of the individual capacity of the body; it was retained only during the first months of the lactation period, and later on changed into a negative T wave. The configuration of the T wave was not essentially affected by the blood serum levels of total protein, blood sugar, LDH, AcAT, AlAT, Ca, P, and Mg.

[Incidence of hoof diseases in cows raised using new technologies].

Investigations were carried out on three farms in the Republic of Cuba with 942 cows (Holstein-Zebu crosses) as well as on the Agro-Industrial Complexes in the Stara Zagora and Sliven districts of the People's Republic of Bulgaria with a total of 19,065 cows of the Black-and-white and the Brown Bulgarian breed under various conditions of raising technologies. The work study aimed at establishing the percent of the so-called 'barn hooves' associated with the clinical forms of some diseases. It was found that the percent of deformed hooves was 5-6 with cows that had daily exercise movements, up to 10-with cows having limited movements, and up to 51 and more-with animals deprived of movement.

[Economic losses from hoof diseases in cows].

Investigations were carried out under productional conditions with a total of 100 high-producing cows in lactation to disclose the effect of diseased hooves or hooves that had not been taken care of over the period in the stable as well as the effect of hoof trimming and treatment on the daily and monthly milk yield and the total losses associated with deformations and diseases in 20,980 cows. It was found that 'stable' hooves and disease processes developing in them and in the body as a whole lowered the milk yield by 3.3 l, on an average, per cow (4.