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Scheduled Breeding of Gilts after Estrous Synchronization with Altrenogest^1,2,

Kansas State University³, Manhattan 66506

Abstract

Fertility of 104 gilts artificially inseminated (AI) at a predetermined time (scheduled AI) after estrous synchronization with altrenogest (15 mg·gilt^–1 · d^–1 for 18 d) was compared with that of 103 gilts checked for estrus (estrus checked) and inseminated after altrenogest. Scheduled-AI gilts were inseminated once on d 5, 6 and 7 after the last altrenogest feeding (d 0). Estrus-checked gilts were exposed to a boar twice daily at 0830 and 1630 h and inseminated after the second and third estrous detection period following first detected estrus. Percentage of gilts assigned to treatment that farrowed (72.8 vs 67.3%), total pigs farrowed (11 ± .4 vs 11.3 ± .4) and pigs born alive (10.1 ± .4 vs 10.5 ± .4) were similar for estrus-checked and scheduled-AI gilts, respectively. We conclude that scheduled AI can be used with estrous synchronization for gilts and may have advantages in breeding herd management and the use of AI in swine.

¹ Contribution No. 84-340-J, Kansas Agr. Exp. Sta., Manhattan 66506.

² The authors appreciate the generous donation of the progestogen (altrenogest) used in this study from Dr. Stephen K. Webel and Roussel — UCLAF. The excellent technical assistance of S. Durham and S. Christianson is acknowledged gratefully.

³ Dept. of Anim. Sci. and Ind.