Control of reproduction - BRAIN :racing_car: (Applied reproductive…
Control of reproduction - BRAIN :racing_car:
Reasons for GnRH (Gonadotropin releasing hormone)
Induces profound inhibition of GnRH
This is why Heifers take longer to get back into calf as they are still being milked or suckled and so more inhibition of GnRH
Plasma FSH allows follicle development, but no ovulation
Long and Dark Vs Short and Light Rods and cones - Kiss hormones
Superior cervical ganglion
Onset of puberty
Controlled by the hypothalamus
Factors affecting onset?
Social cues - Presence of male?
Season of birth and photoperiod - Energy supply may be affected etc
Size and fatness - Ready for conception?
Applied reproductive physiology
Menopause - ONLY primates
So... follicular maturation and ovulation occurs throughout life
20% HEIFERS FAIL TO REACH 2ND LACTATION