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Tо investigаte hоw reprоductive processes influence the vitаmin аnd mineral content of heifers and cows and their subsequent effects on follicle selection, with the goal of encouraging producers to optimize mineral supplementation for improved breeding outcomes. Objective 1: To monitor follicle-stimulating hormone (FSH) levels and their relationship with FSH-sensitive follicles in heifers and cows. Hypothesis 1: Animals with no vitamin or mineral deficiencies will exhibit lower baseline FSH levels, reflecting more efficient follicle recruitment. Objective 2: To examine luteinizing hormone (LH) levels during dominant follicle selection and the inhibition of subordinate follicles. Hypothesis 2: Animals without deficiencies will display higher LH levels, indicative of enhanced follicular selection and ovulatory capacity. Objective 3: To monitor antral follicle count and dominant follicle growth via ultrasonography. Hypothesis 3: Animals with balanced vitamin and mineral profiles will have higher antral follicle counts and superior dominant follicle maturation rates. References: Ferraretto, L.F., et al. (2014). Effects of Feed Restriction on Reproduction and Metabolic Hormones in Dairy Cows. Journal of Dairy Science, 97(2), 754–763. Walsh, S.W., et al. (2014). Heritability and Environmental Impact on Antral Follicular Count in Cattle. Journal of Dairy Science, 97(7), 4503–4511.