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Intravaginal sponges to synchronize estrus decrease sexual attractiveness in ewes.

M Gatti1, R Ungerfeld

  • 1Departamento de Fisiología, Facultad de Veterinaria, Universidad de la República, Montevideo, Uruguay.

Theriogenology
|August 29, 2012
PubMed
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Intravaginal sponges used for estrous synchronization in ewes reduce their sexual attractiveness to rams. Adding antibiotics to the sponges did not improve attractiveness, indicating a negative impact of progestagen treatment on ewe signaling.

Area of Science:

  • Animal Reproduction
  • Behavioral Ecology
  • Veterinary Science

Background:

  • Vaginal secretions contain chemical signals crucial for ewe sexual attractiveness.
  • Disruptions to the vaginal flora can decrease the sexual attractiveness of estrous ewes.
  • Intravaginal sponges containing progestagens are commonly used for estrous synchronization in sheep and may alter vaginal flora.

Purpose of the Study:

  • To determine if estrous ewes pretreated with intravaginal sponges are less attractive to rams compared to ewes with spontaneous estrus.
  • To investigate whether adding an antibiotic to the intravaginal sponges can mitigate any decreased sexual attractiveness.

Main Methods:

  • Experiment 1: Compared attractiveness of ewes synchronized with medroxyprogesterone acetate sponges (MAP1) versus those with spontaneous estrus (C1).

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  • Experiment 2: Compared attractiveness of ewes treated with antibiotic-containing sponges (Ox) versus those with non-antibiotic sponges (MAP2).
  • Sexual attractiveness was assessed by recording ram courting and mating time with individual ewes, ranking their preference.

    • Main Results:

    • Ewes with spontaneous estrus (C1) were significantly more attractive to rams than those synchronized with medroxyprogesterone acetate sponges (MAP1).
    • Sexual attractiveness of ewes treated with antibiotic-containing sponges (Ox) was similar to those treated with non-antibiotic sponges (MAP2).
    • The inclusion of oxytetracycline in the sponges did not mitigate the negative effect on sexual attractiveness.

    Conclusions:

    • The use of medroxyprogesterone acetate intravaginal sponges negatively impacts ewes' sexual attractiveness.
    • The addition of a local antibiotic (oxytetracycline) to the sponges does not counteract this decrease in attractiveness.
    • Progestagen-based estrous synchronization protocols may reduce reproductive signaling effectiveness in ewes.