Copulatory behaviour

COPULATORY BEHAVIOUR

Mounting

  • The sexually stimulated active male mounts the female. Few initial mountings may not be successful with dribbling from the penis.
  • During this process of mounting the movement of hind limbs and contractions of rectus abdominis muscle will align the penis horizontally and vertically to seek the vulva for intromission

The male will fix its fore limbs around the females body and will perform rhythmic pelvic thrusts.

Intromission

Successful entry of the penis into the vagina is called as intromission.

  • The thrusting movement of the pelvis will help intromission.
  • The vulvar moisture and heat is identified by to and pro movement of the penis and the sensory nerves of the penis is stimulated. This is major factor for intromission.
  • Stallion oscillates the pelvis many times, engorgement of penis occurs and finally the intromission occurs.

Ejaculation

  • The time of ejaculation varies with the species.
  • The animals like bull and ram will ejaculate in short period of time (within one or two seconds) and are called as short copulators whereas the boar and dog will take longer duration up to 30 minutes for ejaculation and are called as sustained copulators.
  • The stallion is intermediate copulator ( 20 seconds to 1 minute) with regard to duration of copulation.
  • In bull and ram the ejaculation is stimulated by warm temperature of the vagina. But in stallions and boar, the vaginal pressure is important when compared to temperature.

Species

Volume of ejaculate

Site of deposition

Duration of copulation

Bovine

3-5 ml

Anterior vagina, external os of the cervix

1-3 sec

Equine

75-120 ml

Cervix and uterus

20-60 sec

Caprine/ovine

0.8-2 ml

Fornix vagina

1-2 sec

Swine

200-250 ml

uterus

5-30 min

Dog

1-5 ml

Uterus

20-30 min

Last modified: Monday, 11 June 2012, 11:06 AM