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A study was conducted to examine the effects of intrauterine plastic devices on the estrous cycle length ovum fertilization embryo survival corpus luteum weight and and progesterone content in the pig. Inflammatory responses associated with the presence of the devices were also examined. Polyethylene spirals (IUDs) were inserted by laparotomy on Day 1 of estrus into 1 or both uterine horns of cyclic gilts. Sham-operated gilts served as controls. Immediate postoperative estrus cycles averaged 20 days for 27 gilts with IUDs and 19.8 days for 14 controls. 11 gilts with IUDs were mated at 19 later estrous periods. All returned to estrus after mating with cycles averaging 21.2 days. For the 3 gilts with IUDs in both horns 9 cycles subsequent to the immediate postoperative cycles averaged 20.2 days in length. Thus there was no evidence that as many as 6 of these IUDs in 1 uterus could affect the length of the estrous cycle. Gilts were autopsied at 3 8 to 10 or 14 days after mating. Ova were fertilized in IUD gilts and most embryos were still alive 8 to 10 days after mating. A high rate of embryonic mortality occurred between 8 and 14 days. Leucocytes were present in the uterine lumen of IUD gilts at 8 to 10 and 14 days after mating. In 20 gilts killed 9 or 14 days after mating weights of corpora lutea were significantly less in IUD gilts than in controls but luteal progesterone levels did not differ significantly. In the IUD gilts there was no evidence that the corpora lutea were smaller on the side of the IUD than on the contralateral side.

FERTILITY AND CORPUS LUTEUM CHARACTERISTICS IN PIGS WITH PLASTIC DEVICES IN THE UTERINE LUMEN