Changes

PL is also referred to as Chorionic Somatomammotropin (CS).

PL is also referred to as Chorionic Somatomammotropin (CS).

===Relaxin===

===Relaxin===

Relaxin is produced in the placenta and ovaries throughout pregnancy. During pregnancy relaxin prevents the initiation of uterine contractions, together with progesterone. Relaxin is also responsible for the softening of connective tissues in the cervix and ligaments in the pelvis prior to parturition. This relaxation of tissues via relaxin is performed in conjunction with prostaglandin.

Relaxin is produced mainly by the corpus luteum in most species and in the placenta(main contributor in the equine) and ovaries throughout pregnancy. During pregnancy relaxin prevents the initiation of uterine contractions, together with progesterone. Relaxin accumulates troughtout pregnancy and is released in lare amounts a few days before partus. Its target organs are the cervix, vagina, pubic symphesis and related structures. Relaxin is responsible for the softening and relaxation of connective tissues in the cervix, muscles and ligaments in the pelvis prior to parturition. Estradiol priming is required for this. This relaxation of tissues via relaxin is performed in conjunction with prostaglandin.