[Clinical study results of the embryonic development in gilts and brooding performance of gilts and sows after HCG treatment on the 11th day of pregnancy].

Forty-four pregnant gilts were slaughtered on the 32nd and 33rd days of pregnancy, after 30 of them had received 100 or 400 IU of HCG on the eleventh day of pregnancy. Both doses had resulted in higher number of living embryos. Embryo survival rates of treated sows were up to 14.

[The effect of steroid hormone doses after ovariectomy on the peripheral hormone processes and uterine development in gilts. 2. Effects on gilts during early pregnancy].

Experimental studies were conducted into ovariectomized pregnant gilts to establish effects of exogenic hormone administration, with endogenic ovarian steroids excluded, upon uterus and fetus development as well as on hormone levels in blood plasma, endometrium, and allantoic fluid. Hormone concentrations in blood plasma were found to depend clearly on hormone doses applied after ovariectomy to preserve pregnancy. 2 to 3 weeks of smooth gravidity, following ovariectomy, were ensured on the 6th or 14th day after KB1 by daily application of very low doses of progesterone only (80 mg) or in combination with estrogens, the ratio being 480:1.

[Experimental studies of the modification of the reproductive process during early pregnancy in young sows using the Gn-RH analog Gonaret "Berlin Chemistry"].

Thirty-three inseminated gilts received treatment on the tenth day of gravidity, using 50 micrograms of Gonavet "Berlin-Chemie", a gonadotropin releasing hormone analogue. They were all slaughtered on the 32nd or 33rd day of gravidity. The number of pregnant sows was higher by 4.

[The effect of steroid hormone administration after ovariectomy on the peripheral hormone kinetics and uterine development in gilts. 1. Effects on cyclic gilts].

Studies were conducted into effects of various steroid hormone doses on uterus development and steroid levels in blood plasma and endometrium of ovariectomized cyclic gilts. Differences were found to exist between experimental and control animals with regard to uterus weight and length in the wake of ovariectomy and steroid treatment. Steroid concentrations in blood plasma exhibited discernible changes, depending on dosage.

[Experimental studies on the stimulation of prenatal development in swine by PMSG treatment in early pregnancy. 2. Analytic studies of hormones in young sows after PMSG treatment on the 11th day of pregnancy].

Tens gilts received 400 I.U. of Pregmagon on the 11th day of pregnancy (day of KB2 = 1 day of pregnancy), while 8 sows were used as controls.