Scheduled breeding of gilts after estrous synchronization with altrenogest.
Fertility of 104 gilts artificially inseminated (AI) at a predetermined time (scheduled AI) after estrous synchronization with altrenogest (15 mg X gilt-1 X 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.
D000818:Animals; D004963:Estrenes / Q000494:pharmacology*; D004971:Estrus / Q000187:drug effects*; D004973:Estrus Synchronization; D005260:Female; D005306:Fertilization; D007315:Insemination, Artificial / Q000662:veterinary*; D008098:Litter Size; D011247:Pregnancy; D013552:Swine / Q000502:physiology*; D014204:Trenbolone Acetate / Q000031:analogs & derivatives / Q000494:pharmacology*
D004963:Estrenes; C023445:altrenogest; D014204:Trenbolone Acetate