AVS 101 Lecture 12: Lecture 12 notes Breeding, pregnancy and gestation

• School: URI
• Department: Animal and Veterinary Science
• Course: AVS 101
• Professor: Anthony Mallilo

Document Summary

Proestrus: time prior to estrus (heat, attracts male, male arousal. Estrus: lasts a few hours to a couple of days. Pregnancy: fertilized egg migrates to uterus, 16 cell stage of embryo, attaches to uterine wall via enzyme action, horse embryo floats for weeks, delayed implantation, uterus changes during cycle, buildup/tear down of uterine tissue. Progesterone: produced by cl (corpus luteum, maintains pregnancy, if cl removed from ovary, results in abortion, animals with long gestation, cl drops in progesterone, placenta produces progesterone. Prolactin: maintains cl -> progesterone -> pregnancy maintained, initiates/maintains lactation. If pregnancy does not occurs: cl regresses -> ca, no progesterone, cycle repeats. Pregnancy: fertilization occurs in the upper third of the oviduct (fallopian tube) Uterine attachment: diffuse, most animals: pigs, dogs, cats, people, horse, cotyledons, ruminants: sheep, cows, button-like carnucles. Dystocia: difficulty breathing, causes, heavy birth weight, age of dam, pelvic area of dam.