Reproductive Physiology and Endocrinology: Parturition and Stages of Labor - Prof. Joel V., Study notes of Animal Biology

Download Reproductive Physiology and Endocrinology: Parturition and Stages of Labor - Prof. Joel V. and more Study notes Animal Biology in PDF only on Docsity! ANS 3319C Reproductive Physiology and Endocrinology Spring 2009 152 Parturition 1) ________________________________________________________________________________ _____________________________________________________________________________ Initiates fetal stress response (Fig 14-11 to 14-14) ___________________________________________________________________________ Cortisol (+) gradual endocrine changes of placenta _____________________________________________________________________ __________________________________________________________________ __________________________________________________________________ _____________________________________________________________________ __________________________________________________________________ __________________________________________________________________ Fig 14-13 Fig 14-14 ANS 3319C Reproductive Physiology and Endocrinology Spring 2009 153 2) Stages of parturition (Table 14-2) Stage I: _____________________________ ________________________________________________________ Estrogen (+) cervical & uterine secretion of mucus Lubrication of birth canal Relaxin: (+) stretching of pelvic ligaments ____________________________________________________________________________ _____________________________________________________________ (Fig 14-15) ______________________________________________________________________ ___________________________________________________________________ Behavioral changes: __________________________________________________________ Stage II: ____________________________________ _____________________________________________________________________________ _____________________________________________________________________________ _____________________________________________________________________________ Stage III: _____________________________________________________ Rapid process post-parturition Difficult birth, delayed membrane expulsion Chorionic villi released from endometrial crypts Vasoconstriction of villi arteries 3) Dystocia or difficult birth ____________________________________________________________________ _________________________________________________________________ Causes of dystocia ______________________________________ (common in animals giving birth first time) Pelvic area to small to allow fetal passage