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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