we concluded : ( 1 ) that a single ovary was responsible for the sustained increases in concentration of estradiol that occur during proestrus to estrus and early diestrus in cows and ( 2 ) that cows may have at least one follicle capable of producing estradiol during most days of an estrous cycle , thus little delay in selection of which follicle eventually ovulates occurs after luteal regression .
C0029939
ovary
C0025329
estrous cycle