[Experiments in biological engineering to induce puberty in young female swine. 3: Effects of different FSH/HCG combinations on heat and ovulation in animals aged 170 to 180 days].

FSH/HCG combinations in four different variants were applied subcutaneously to 18 young female pigs, aged about 175 days and kept in one and the same fattening stock, for the purpose of puberty induction. The following combinations, in International Units, were used in the four groups: 100/200 (I), 200/200 (II), 100/300 (III), and 200/300 (IV). Strong oestric symptoms were produced in following-up period up to ten days after-injection in 44.4 per cent (I), 33.3 per cent (II), 55.6 per cent (III), and 27.8 per cent (IV). Fifty per cent of each group were laparotomised on the fifth or sixth day from injection, but no visible differences were found to exist between the patterns of these two days. Ovulation had taken place by the time of laparotomy in 33.3 per cent (I), 44.4 per cent (II), 66.7 per cent (III), and 44.4 per cent (IV) and by the time of slaugher, 13 to 17 days from injection, in 33.3 per cent (I), 72.2 per cent (II), 72.8 per cent (III), and 38.9 per cent. The uterus weights of the animals with ovulation were 355 g (I), 373.3 g (II), 293.8 g (III), and 300 g (IV) and the numbers x of corpora lutea accounted for 17 (I), 17.6 (2), 29.3 (III), and 10.8 (IV). The corpus luteum level was beyond 20 in 57.1 per cent of all animals with ovulation in group III and in something between 12.5 and 33.3 per cent in the other groups. The differences in action that existed between the gonadotrophin combinations are discussed.