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Estrus or oestrus refers to the phase when the female is sexually receptive ("in heat" in American English, or "on heat" in British English). Under regulation by gonadotropic hormones , ovarian follicles mature and estrogen secretions exert their biggest influence.
Concealed ovulation or hidden estrus is the lack of any perceptible change (e.g., a change in appearance or scent) when an adult female is fertile and near ovulation.Some examples of perceptible changes are swelling and redness of the vulva in baboons and bonobos, and pheromone release in the feline family.
Betaarterivirus suid 1, commonly Porcine reproductive and respiratory syndrome virus (PRRSV), is a virus that causes a disease of pigs, called porcine reproductive and respiratory syndrome (PRRS), also known as blue-ear pig disease (in Chinese, zhū láněr bìng 豬藍耳病).
What are the signs of wild hogs? If you see these popping up, it’s a tell tale sign that hogs are near. Pictures can be found on pages 10 and 11 of the “Managing Wild Pigs: A Technical Guide”.
Postnatal infection (pigs up to 1 year of age): Infection occurs oro-nasally, followed by a viremic period associated with transitory leucopenia. Infection in adults (over 1 year of age): These subject would have an active, protective immune system which protects them from future exposures (e.g. mating with an infected male).
Younger pigs can show neurological and respiratory signs which can be quite severe. Mature pigs may show blueing of the pupils in their eyes and experience reproductive difficulties. [4] Adults of both sexes may become infertile and sows may suffer from abortions and stillbirths. Inappetence; Corneal opacity – conjunctivitis
Dams may return to estrus, fail to farrow despite being anestrus, farrow few pigs per litter, or farrow a large proportion of mummified fetuses. All can reflect embryonic or fetal death or both. The only outward sign may be a decrease in maternal abdominal girth when fetuses die at midgestation or later and their associated fluids are resorbed.
Signs and symptoms [ edit ] Symptoms include aural fullness, ears popping, a feeling of pressure in the affected ear(s), a feeling that the affected ear(s) is clogged, crackling, ear pain , tinnitus , autophony , and muffled hearing.