Effect of Unilateral Ovariectomy in the Yorkshire and Poland China Prepuberal Gilt

Induced Ovulation and Fertility in Prepuberal Cattle, Sheep and Swine

“…The youngest animal tested that responded was 107 days old. Dailey et al (1969) found vesicular follicles in all ovaries removed from pigs at 65 days of age. There was a considerable increase in number of follicles 3 to 6 mm in diameter by 170 days of age, while the ovaries more than doubled in size from 65 to 170 days.…”

Hormonal Induction of Ovulation Stimulates Atresia of Antral Follicles in Gilts1

“…In the early-maturing breed, however, as indicated by the population of follicles present both before and after hormonal treatments, the ovarian dynamics seem to remain quite similar to those of the late-maturing breed at a given age group selected for the present experiment. Likewise, when the ovarian mass is taken into consideration, the total follicular population (representing around 64% of the ovarian mass in 170-day-old Yorkshire gilts [20] did not appear to modify the hormonal response since the Meishan breed, with smaller ovarian follicular mass [6], showed a response similar to that of the Large White breed in terms of ovulation rate. Therefore, it would appear that it is rather the condition of follicles (around 45% are atretic) than the total number present at treatment that determine the hormonal response, atretic follicles being refractory to any hormonal stimulation.…”

“…Ovarian compensatory hypertrophy was observed to be greater in a breed with a high ovulation rate (Yorkshire) compared to a breed with a low ovulation rate (Poland China) after unilateral ovariectomy was performed at 65 or 177 days of age [20]. The same authors have established that in cycling animals, ovulation rates cannot be correlated with atresia as determined by macroscopic observation of milky or hemorrhagic follicles present before or after ovulations [22].…”

Risk of ovarian failure and fertility preserving methods in girls and adolescents with a malignant disease

“…78 However, there seems to be a compensatory hypertrophy of the remaining ovary in unilaterally oophorectomised mice, rabbits and gilts. [78][79][80] Women with a single ovary undergoing IVF do not seem to have a reduced fertility potential, although they do have higher FSH concentrations than women with two intact ovaries, indicating a reduced ovarian reserve. 81,82 For obvious reasons, we still lack data on the ovarian function of women who have had an ovary removed for cryopreservation in childhood before being subjected to chemotherapy.…”