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URI AVS 101 - Reproduction

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AVS 101 1st Edition Lecture 10ReproductionBirds (roosters) No sex accessory gland No copulatory organ– except water fowl Testes are internalPoultry Small ejaculate w/ high sperm concentration Sperm cells vary in appearance between speciesSperm Head  Mid piece TailOvary Produces ova (egg) Produces female sex hormonesInfundibulum Funnel shape structure that catches eggOviduct Fallopian tubes Site of fertilizationUterus Site of implantation Bicornuate uterus– Body of uterus is small– Horns are long– Sow, bitch, cat, cow Bipartite uterus– Well-developed body– Short horns– Horse, ewe, womanCervix Plugs during pregnancyVagina Organ of copulationClitoris Stimulates contraction for sperm mobilizationVulva Heat detectionEstrogens & Ovulation Causes aspect of female reproductive behavior Female secondary sex characteristic development Germ cell-several thousandPituitary Gland Produces follicle stimulating hormone (FSH)Follicle Stimulating Hormone Is produced cyclical Responsible for growth of follicle As follicle increases in size, estrogen production increasesLuteinizing Hormone (LH) Causes ovulationIf egg does not become fertilized… Corpus luteum (CL) disappears CL becomes Corpus Albicans (CA)If pregnancy occurs…. CL is maintainedReproductive Cycles Estrous cycles– Copulation occurs only during “heat”– 99% of mammalsReproductive Cycles Menstrual cycles– Copulation occurs any time during cycle– 1% of


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URI AVS 101 - Reproduction

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