Effects of progesterone pretreatment on fertility of gilts mated at an induced pubertal estrus

Kenneth Nephew, H. Cardenas, W. F. Pope

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The effects of progesterone (100 mg/d, im) on pubertal fertility were examined in 247 gilts over 3 experiments. In the first experiment, 128 gilts were exposed to progesterone for 0, 2, 4 or 8 d before receiving PMSG (750 IU) 1 d later. The number of large (>4mm) follicles or corpora lutea (CL) were determined on the day of PMSG injection, Day 0 (onset of estrus), Day 1 or Day 10 (n=8). In the second experiment, embryonic survival was observed in 68 gilts after induction of estrus with PG600 (400 IU PMSG, 200 IU hCG). Vehicle or progesterone was previously administered for 2 d to these gilts, and they were allowed 1, 2, or 3 d between the last progesterone injection and PG600. In Experiment 3, a field trial was conducted in which 51 gilts received vehicle or progesterone for 2 d, followed by a 3-d interval before injection of PG600 to induce estrus. The gilts were allowed to farrow. Treatment with progesterone 1 d before PMSG increased (P

Original languageEnglish (US)
Pages (from-to)99-106
Number of pages8
JournalTheriogenology
Volume42
Issue number1
DOIs
StatePublished - 1994
Externally publishedYes

Fingerprint

Estrus
gilts
Progesterone
Fertility
estrus
progesterone
pretreatment
injection
Injections
human chorionic gonadotropin
Corpus Luteum
farrowing
corpus luteum
field experimentation

Keywords

  • gilts
  • litter size
  • ovulation rate
  • progesterone
  • puberty

ASJC Scopus subject areas

  • Animal Science and Zoology
  • veterinary(all)

Cite this

Effects of progesterone pretreatment on fertility of gilts mated at an induced pubertal estrus. / Nephew, Kenneth; Cardenas, H.; Pope, W. F.

In: Theriogenology, Vol. 42, No. 1, 1994, p. 99-106.

Research output: Contribution to journalArticle

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