Follicular dynamics and changes in oestradiol‐17β, progesterone and LH profiles following PGF 2α induced oestrus in early and late ovulating Beetal goats

• Published in: Reproduction in domestic animals 2019-03, Vol.54 (3), p.545-550
• Main Authors: Murtaza, Ali, Ahmad, Waqas, Sohail, Tariq, Khan, Muhammad Irfan‐ur‐Rehman, Mohsin, Imran, Shahzad, Muhammad, Hussain, Mujahid, Tahir, Muhammad Zahid, Ijaz, Muhammad
• Format: Article
• Language: English
• ISSN: 0936-6768; 1439-0531
• DOI: 10.1111/rda.13392

This study compares the factors associated with variable interval to oestrus and ovulation between early versus late ovulating goats following PGF 2α administration. The time of ovulation in Beetal goats ( n  = 38) was monitored through transrectal ultrasound at every 6 hr following a single dose of PGF 2α (experiment 1). Variations in oestrus and ovulation times were further explored through the changes in follicular dynamics, endocrine profiles and behaviour in another set of goats ( n  = 13) following single PGF 2α given randomly during the luteal phase (experiment 2). The ovulation time varied between 60 and 96 hr, and 57% of ovulations occurred by 72 hr following PGF 2α (experiment 1). Accordingly, the goats ( n  = 13) in the second experiment were retrospectively divided either into early and/or late ovulating, that is, ≤72 and/or ≥84 hr following PGF 2α . The onset of oestrus, peak estradiol‐17β concentration and LH surge after PGF 2α was first observed in early than late ovulating goats ( p