Response of gilts with delayed puberty to pregnant mare serum gonadotropin or estrogen.

Abstract

The effect of pregnant mare serum gonadotropin (PMSG) or estradiol cyclopentylpropionate (EC) on the induction of estrus, duration of estrus, and serum progesterone concentration after estrus was evaluated in 8 gilts with delayed puberty. Four gilts were given 500 IU of PMSG IM and 4 were given 2 mg of EC, IM. The inactive status of the ovaries at the time of treatment was verified by serum progesterone values of less than 0.5 ng/ml in serial samples collected before treatment. The 4 EC-treated gilts came into estrus at a mean of 3.5 days after treatment, but 1 of the gilts did not form corpora lutea. Three PMSG-treated gilts came into estrus at a mean of 4.0 days after treatment. The remaining PMSG-treated gilt remained anestrus and did not form corpora lutea. The mean duration of estrus in EC-treated gilts was 5.25 days compared with 2.0 days for PMSG-treated gilts (P less than 0.05). Serum progesterone concentrations were higher in PMSG-treated gilts than in EC-treated gilts at 8, 11, and 17 days after treatment (P less than 0.05).

• Authors: J P Hurtgen, S D Johnston
• Journal: American journal of veterinary research (Am J Vet Res) Vol. 44 Issue 10 Pg. 1943-5 (Oct 1983) ISSN: 0002-9645 [Print] United States
• PMID: 6685445 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Gonadotropins, Equine
• Progesterone
• Estradiol
• estradiol 17 beta-cypionate

Topics

• Animals
• Corpus Luteum (growth & development)
• Estradiol (analogs & derivatives, pharmacology)
• Estrus
• Female
• Gonadotropins, Equine (pharmacology)
• Pregnancy
• Progesterone (blood)
• Sexual Maturation (drug effects)
• Swine (physiology)