Discipline: Veterinary Medicine
Porcine follicle stimulating hormone (FSH-P) was used to superovulate 22 donor cows utilizing two methods or administration. Nine of eleven donors responded to FSH-P administered in decreasing close while 10 of 11 donors responded to FSH-P in constant close. Although donors given constant dose of FSH-P yielded more corpora lutca, embryos and normal embryos, than donors treated with decreasing dose of FSH-P, a significant difference was not observed. Twenty-six normal embryos were transferred to estrus synchronized recipients resulting in 17 pregnancies and 16 live births. Seventy-five normal embryos recovered were vitrified. Twenty vitrified embryos were subsequently warmed and transferred to recipients resulting in 10 pregnancies and eight live births.