J. Anim Sci.
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J. Anim Sci. 1982. 54:142-149.
© 1982 American Society of Animal Science
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Bilateral Luteal Maintenance in Unilaterally Pregnant Pigs with Infusions of Embryonic Extracts1

G. D. Ball2 and B. N. Day

University of Missouri3, Columbia 65211

Abstract

Thirty unilaterally pregnant gilts with bilateral corpora lutea received infusions three times daily into a surgically isolated, nonpregnant uterine horn from d 12 through d 19 after mating. The infusions consisted of either saline alone or embryonic extracts in saline which were either untreated, heat-treated or charcoal-adsorbed. The extracts were from porcine embryos, embryonic membranes and fluids between d 16 and 25 of pregnancy. While only 20% of the gilts infused with saline alone and none of those infused with charcoal-adsorbed embryonic extracts maintained pregnancy to d 19, 100 and 83% of the gilts infused with untreated and heat-treated embryonic extracts, respectively, were pregnant on d 19. Similar treatment effects were observed for the incidence of bilateral luteal maintenance. No gilts receiving infusions of either saline or charcoal-adsorbed embryonic extracts exhibited bilateral luteal maintenance. However, 67% of the gilts infused with untreated embryonic extracts and 67% of those infused with heated extracts had bilateral luteal maintenance on d 19. Additionally, the weights and progesterone concentrations of corpora lutea adjacent to the infused uterine horns were not different (P> .05) from those of the corpora lutea adjacent the to pregnant uterine horns in gilts with bilateral luteal maintenance.

Key Words: Swine • Pregnancy • Embryo • Corpora Lutea

Footnotes

1 Contribution from the Missouri Agr. Exp. Sta. Journal Series No. 8634. Approved by the Director.

2 Present address: Meat and Anim. Sci. Dept., Univ. of Wisconsin, Madison 53706.

3 Dept. of Anim. Sci.






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Copyright © 1982 by the American Society of Animal Science.