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Intrauterine Infusion of Killed Semen to Increase Litter Size in Gilts^1,2,3,

The Ohio State University and Ohio Agricultural Research and Development Center, Wooster 44691

Abstract

Two experiments of identical design were performed to determine effects on reproductive performance of intrauterine infusion of killed semen followed by breeding to the same boar producing the infused semen or intrauterine infusion of gilts, and breeding with semen from another boar. In each experiment, gilts were randomly allotted to one of three groups: control (no treatment), same boar (infused with semen from the boar used to breed a particular gilt) and different boar (infused with semen from a different boar than used for breeding). The experiments, though identical in design, were performed at different seasons of the year. Experiment 1 was initiated in the winter, and Exp. 2 was initiated in the summer. Reproductive performance was generally better in Exp. 1 than in Exp. 2. No statistically significant differences were detected between the infused groups and no interaction between treatment and experiment was detected. Pooling data from the two infused groups compared with the control group revealed significant improvement in reproductive performance measured at birth. Killed semen infusion resulted in approximately 1.3 more live pigs per litter at birth than controls. It appears that infusion of gilts with killed semen from any boar is as beneficial as specific semen infusion in which the source of infused semen is the same as that for breeding. This should prove useful in swine production systems because of its simplicity.

¹ Salaries and research support provided by state and federal funds appropriated to the Ohio Agr. Res. and Devel. Center, The Ohio State Univ. Journal Article No. 200-84.

² Dept. of Anim. Sci.

³ Partially funded by the Ohio Pork Producers Council.

⁴ Present address: Dept. of Zool. and Biomed. Sci., College of Osteopathic Med. and The Edison Animal Biotechnology Center, Irvine Hall, Ohio Univ., Athens 45701.

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