Onset of oestrus and periovulatory events in sheep exposed to 5 and 14 days of CIDR treatment with and without eCG

Reprod Domest Anim. 2019 Nov;54(11):1489-1492. doi: 10.1111/rda.13537. Epub 2019 Aug 14.

Abstract

The present study supports that 5-day short-term CIDR treatments without administration of eCG are equally effective for inducing oestrus behaviour, preovulatory LH discharge and ovulation in sheep than classical protocols based on 14-day treatments plus eCG at CIDR withdrawal. However, the implementation of a 5-day protocol without eCG for fixed-time artificial insemination would be adapted to a later timing of ovulation (p < .05).

Keywords: CIDR; eCG; oestrus-synchronization; ovulation; sheep.

MeSH terms

  • Administration, Intravaginal
  • Animals
  • Estrus / drug effects*
  • Estrus Synchronization / metabolism
  • Female
  • Gonadotropins, Equine / administration & dosage
  • Gonadotropins, Equine / pharmacology*
  • Ovulation
  • Ovulation Induction / methods
  • Ovulation Induction / veterinary
  • Progesterone / administration & dosage
  • Progesterone / pharmacology*
  • Sheep

Substances

  • Gonadotropins, Equine
  • Progesterone