Alpha fetoprotein functions as a foetal blood osmotic regulator and a carrier of fatty acids. As GnRH surges, LH and oestradiol surge about every 20 days in the female. Surge frequency varies between species and is dependent on the length of their [[Oestrous Cycle - Anatomy & Physiology|oestrous cycles]]. Between surges, there are low amplitude LH pulses. | Alpha fetoprotein functions as a foetal blood osmotic regulator and a carrier of fatty acids. As GnRH surges, LH and oestradiol surge about every 20 days in the female. Surge frequency varies between species and is dependent on the length of their [[Oestrous Cycle - Anatomy & Physiology|oestrous cycles]]. Between surges, there are low amplitude LH pulses. |