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Influence of Pig Embryos on Uterine Growth¹

University of Illinois^,4, Urbana, IL 61801

Abstract

The influence of embryos on growth of the uterus was determined by comparing uterine length, weight and diameter between gravid and nongravid horns within unilaterally pregnant gilts. Eighty-two prepubertal gilts were ovariectomized unilaterally at 5 mo of age, and the ipsilateral uterine horn was ligated near the junction of the uterine horns. Gilts were mated and were assigned randomly for examination on either d 9, 12, 15, 18, 21, 24 or 27 of gestation. Absolute differences and ratios in length, weight and diameter between gravid and nongravid horns of unilaterally pregnant gilts were analyzed. The gravid horn was 40% longer than the nongravid horn from d 18 to 27. Uterine horns with embryos increased linearly in weight and diameter (P < .01) between d 15 and 27. Embryos, or the signals that they might give, apparently caused increases in length, weight and diameter of the uterine horn by d 18, but not before.

¹ Funding was provided by Grants for Agric. Res., USDA Competitive Res. Grants (AG 86-CRCR-1-2180).

² Present address: Dept. of Anim. Sci., College of Agric., Chonbuk National Univ., Chonju, Chonbuk 520, South Korea.

³ To whom reprint requests should be addressed.

⁴ Dept. of Anim. Sci.