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REPRODUCTIVE PHYSIOLOGY (Male Reproductive System (Ampullae 1) Bull &…

- - - - GnRH
        
        FSH
        
        LH
      - CRH
        
        ACTH
      - GHRH
        
        GH
      - PIH
        
        Prolactin
      - TRH
        
        TSH
    - - Vasopressin
      - Oxytocin
- - - - 1) Sheep - Estrogen only
        2) Dogs - Progesterone
        3) Cats, Goats and Horses - Show estrus with no apparent requirement for progesterone priming
        4) Dairy Cattle - Progesterone
        5) Ewe lambs - Require the exposure of two or more luteal phases before they express estrus
        6) Sow - Reduced incidence of estrus at 1st ovulation, usually does not occur until after weaning (at least 45 days after parturition)