第二章 畜禽的繁殖课件.ppt

第二章畜禽的繁殖第二章畜禽的繁殖三、家禽的繁殖

ReproductioninPoultryMaleTestesinbodycavityCopulationwithanextensionofcloaca(泄殖腔)UnnecessaryforfemaletolayeggsSpermcanremainviableinfemaleforseveraldaysorweeks!第二章畜禽的繁殖三、家禽的繁殖

ReproductioninPoultry2.FemaleRightovaryoviductfailtodevelopafterhatching.Ovulatestartingatpubertyfor25weeks24+hoursfromoneovulationtonext第二章畜禽的繁殖三、家禽的繁殖

ReproductioninPoultry2.FemaleOviduct:infundibulum(伞部)–eggpickup;spermstoragefertilizationMagnum(膨大部)–secretesalbumen(蛋白)isthmus(峡部)–formsshellmembranes(形成壳膜)Uterus–shellformation(形成壳)Incubatefertileeggs21(chicken)or28(turkey)days第二章畜禽的繁殖第二章畜禽的繁殖ChickenreproductivetractOvumOvaryOviduct第二章畜禽的繁殖Chickenovary第二章畜禽的繁殖第三节生殖激素第二章畜禽的繁殖一、生殖激素的概念

SexualHormonalFunctionHormonescanbeconsideredthefuelwhilethesystemisthemachinery激素是由某些特殊化的细胞（内分泌细胞，某些神经细胞等）所分泌的化学物质，它们可以从一组细胞传递到另一组细胞，或从一个细胞的这一部分传递到同一细胞的另一部分，以发挥其调节作用的一系列微量生物活性物质下丘脑促性腺激素释放激素(GnRH)血液卵巢(睾丸)脑垂体促卵泡激素(FSH)促黄体激素(LH)催产素(oxty)卵巢激素－雌激素－妊酮（黄体酮）睾丸激素－雄性激素二、下丘脑-垂体-性腺轴

hypothalamus-pituitary-ovaryaxis三、雌性生殖激素

HormonesoffemalereproductionHormone Source FunctionGnRH(促性腺激素释放激素)Hypothalamus(下丘脑)FSH,LHreleaseFSH pituitary(脑下垂体) follicledevelopmentLH pituitary ovulation formationofCLProstaglandin(前列腺素)uterus killscorpusluteumestrogen follicle estrus;matingbehavior uterinegrowthprogesterone corpusluteum maintainpregnancy四、下丘脑-垂体-性腺轴的关系

relationshipofhypothalamus-pituitary-ovaryaxisBrain–Hypothalamus(下丘脑) GnRH(促性腺激素释放激素)Brain–AnteriorPituitary(垂体前叶) FSH(促卵泡激素) LH(促黄体激素)Reproductivetract Ovary Ovary -Developmentoffollicle -Ovulation (卵泡发育) (排卵) Ovary–Follicle(卵泡) Ovary–CorpusLuteum(黄体) Estrogen Progesterone Ut