Volume of luteal tissue and concentration of serum progesterone in cows bearing homogeneous corpus luteum or corpus luteum with cavity.

Ultrasonographical examinations of ovarian structures were performed in 27 inseminated cows at estrus days and on days 4, 9, 20, 25, 30, and 40 after ovulation. Three cows were used twice. Corpora lutea (CLs) with a cavity were compared with homogeneous CLs.

[Metabolic profile in cows in the peripartum period with and without retained placenta].

Blood samples were taken and subjected to biochemical analysis in the crossbred cows of the Red-Pied, Black-Pied or Holstein-Friesian breed raised on a large farm under standard conditions, with the average annual milk yield of 4,300 kg milk, and divided into two groups--cows with afterbirth retention and without it; the samples were taken in the last period of pregnancy (since day 245), during parturition, and within the first 50 days post partum. In both groups, the values of acid-base balance and metabolic profile mostly ranged within the interval of reference values, nevertheless there were certain trends and differences in absolute values as well as in the dynamics of changes, but they did not always show a doubtless character and the same significance. The cows with afterbirth retention exhibited a trend of a more expressive decrease in partial pressure CO2, actual acid output and phosphorus level.

[The ovarian response and conception rate in cows during experimental nitrate loading].

The effects of potassium nitrate were investigated on ovarian activity, especially on ovarian activity, especially on follicle ripening and ovulation, conception rate and progesterone levels in the milk of cows with cloprostenol-induced oestrus (Oestrophan Spofa) at a rate of 500 micrograms i.m. Potassium nitrate was administered at an amount of 150 g per head/day, and this amount increased by 50 g every other fortnight to the total rate of 300 g per head/day.

[Early sonographic diagnosis of twin pregnancy in mares and its reduction to a single pregnancy].

The frequency of double ovulation and the chances of twin pregnancy in the mare are presented with reference to the relevant literature. A novel manual technique for reducing the embryo number from two to one is introduced and illustrated by ultrasonographic images.

[The ovarian response and fertility in cows with acidosis induced by acetic acid].

The effects of acetic acid administered at an amount of 300 to 600 g (5 to 10 mol) to the rumen of breeding cows, were investigated on ovulation, conception and progesterone levels in the blood and milk of cows with cloprostenol-induced (Oestrophan Spofa) oestrus at a dose of 500 micrograms i.m. In the group of 15 cows exposed to the acetic acid load five cows got in calf after the first insemination (33.