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REPRODUCTIVE CYCLES (EXTERNAL FACTORS CONTROLLING REPRODUCTIVE CYCLES…

- - - - POSITIVELY AFFECTED BY INCREASING PHOTOPERIOD FOR CAT AND HORSE
      - POSITIVELY AFFECTED BY DECREASING PHOTOPERIOD FOR GOAT AND SHEEP
- - - - Before puberty: GnRH and gonadotropin are kept in check because the hypothalamus is highly sensitive to negative-feedback inhibition by estrogens
      - the onset of puberty results in the establishment of cyclical ovarian activity within a relatively short period
  - - - Menopause results from depletion of oocytes which has occured throughout the reproductive life an individual
        
        involves cyclical irregularity caused by failure of follicle development and ovulation
- - - - period of follicle development (occuring after luteal regression and end at estrus)
    - - period of sexual receptivity
    - - period of initial development of corpus luteum
    - - period of mature phase of corpus luteum