Characteristics and functions of a minor FSH surge near the end of an interovulatory interval in Bos taurus heifers

The apparent function of a minor FSH surge based on temporality with follicular events was studied in 10 heifers with 2 follicular waves per interovulatory interval. Individual follicles were tracked from their emergence at 2 mm until their outcome was known and a blood sample was collected for FSH and LH assay every 12 h from Day −14 (Day 0 = ovulation) to Day 4. A minor FSH surge occurred in each heifer (peak, Day −4.6 ± 0.2). Concentration of LH increased (P < 0.05) during the FSH increase of the minor surge but did not decrease during the FSH decrease.

Source: Domestic Animal Endocrinology - March 16, 2016 Category: Endocrinology Authors: O.J. Ginther, J.M. Baldrighi, M.A.R. Siddiqui, C.A. Wolf Source Type: research