A study of some factors influencing conception rates in dairy cows in Manitoba

dc.contributor.authorJeffery, Herbert B.en_US
dc.date.accessioned2011-06-06T18:14:09Z
dc.date.available2011-06-06T18:14:09Z
dc.date.issued1953en_US
dc.degree.disciplineAnimal Scienceen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractWithin the last twenty years an outstanding advancement in the field of animal production has been made through the adoption of the method of artifical insemination in breeding of females. While artificial insemination has been practiced in a crude, haphazard manner for hundreds of years, only within the last two decades has sufficient knowledge and refinement of techniques been available to assure its practical and economical feasibility. Artificial insemination may be defined as the deposition of semen containing spermatozoa, the male reproductive cells, in the female genitalia by instrument rather than by natural methods. Since only a very small fraction of the total ejaculate of a sire is required to bring about fertilization, it follows therefore, that a tremendous wastage in spermatazoa occurs at every natural breeding. In artificial insemination the total volume of the semen from an ejaculate is divided into many small portions, thereby extending the number of females to which a male may be bred. Modern techniques permit a sire artificially to serve possibly ten thousand females in a lifetime. Under natural conditions the same sire might serve two hundred.en_US
dc.format.extent89 p.en_US
dc.format.extent4655844 bytes
dc.format.mimetypeapplication/pdf
dc.identifierocm72779580en_US
dc.identifier.urihttp://hdl.handle.net/1993/4699
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.rightsThe reproduction of this thesis has been made available by authority of the copyright owner solely for the purpose of private study and research, and may only be reproduced and copied as permitted by copyright laws or with express written authorization from the copyright owner.en_US
dc.titleA study of some factors influencing conception rates in dairy cows in Manitobaen_US
dc.typemaster thesisen_US
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