Guide to practical meat inspection : including examination for trichina / by F. Fischoeder.

  • Fischoeder, F.
Date:
1900
Catalogue details

Licence: In copyright

Credit: Guide to practical meat inspection : including examination for trichina / by F. Fischoeder. Source: Wellcome Collection.

Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.

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    erative fluids (semen and ovum). The male animals produce the semen, the female the ovum. Semen and ovum must unite to form a new animal. The semen is prepared in the testicles which lie in the scrota sack. By the act of copulation the semen is injected into the vagina. It contains the spermatozoa, which force their way from the vagina into the womb and unite with the ovum. The ovum is formed in the ovary, frees itself from the latter and passes through the fallopian tube into the womb After uniting with the male semen here it starts to develop. The womb continually expands, and the young animal, after complete development, is forced out (born). The time at which the ovum ripens in the female and is expelled, is called oestrum. This occurs in the horse on the sixth to the ninth day after parturition, and recurs every four weeks; in the cow, three weeks after parturition and recurs every three to four weeks; in swine, after weaning the shoats, and recurs every three to four weeks; in sheep, six to eight weeks after parturition, and recurs every three weeks. During oestrum the animals show decided symptoms that may have a similarity to the symptoms of other diseases (i. e., rabies). The conduct of the animals changes; they become restless and excited; on the contrary, others become more quiet; they cover one another, urinate copiously, play with the clitoris, lift up the tail, etc. The lips of the vulva are swollen. A slimy, sometimes somewhat bloody exudate flows from the vagina. These phenomena disappear as soon as the animal has conceived, and do not reappear during pregnancy. In horses pregnancy lasts from forty-eight to forty-nine weeks, in cattle forty weeks, in sheep twenty-one and one- half weeks, in swine seventeen weeks. During this time the animals show symptoms which, especially toward the end of pregnancy, have a few similarities to the symptoms of gas- tro-enteritis, mammitis and parturient apoplexy. The cir- cumference of the abdomen becomes larger, the round form