ANSC 2330 Lecture Notes - Lecture 18: Vas Deferens, Luteinizing Hormone, Estrous Cycle
4 Dec 2017
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Route of sperm: testis, epididymis, ductus deferens, urethra/penis. At least 5 billion sperm/day during breeding season. Gametes (oocytes) produced in follicles in ovary. Once every estrous cycle an oocyte is released into the oviduct (ovulation) April to september = regular estrous cycles. Decreasing day length july to december. Anestrus no follicular growth, no behavioural estrus, no ovulation. Transition follicular growth so behavioural estrus (erratic) but no ovulation. Fertilization takes place in the oviduct (fallopian tube) Formation of extra-embryonic membranes prior to implantation. Conceptus (embryo + extra embryonic membranes) remains spherical. Migration on the conceptus through the uterus on days 12 to 14 following ovulation is necessary for maternal recognition of pregnancy. Estrus a recurring period of sexual receptivity and fertility in many female mammals; heat. Required reading: advancing the breeding season for early foals. Questions: why would a breeder want to advance the breeding season, all foals in the northern hemisphere share the same birthday, january 1st.
