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Pregnancy and parturition
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- 2. Pregnancy begins withFertilization – the union of sperm and ovum Creates a zygote
- 3. 24 hours Zona locks out all other sperm Sperm DNA and egg DNA combine Cell divides
- 4. 8 celled pigzygotes
- 5. Day 5 Arrivein the uterus About 100 cells Called a blastisist
- 6. Day 6 Breakout of Zona Suppresses Mother’s immune system in the uterus Attaches to uterine wall Begin to form placenta Placenta is the membrane that surrounds and supports the embryo inside the uterus
- 7. Week 2 Blastisistis the size of a poppy seed Gasterlation begins – forms 3 layers of cells lungs, liver, digestion heart, muscles, bones, blood central nervous system, skin, hair Embryo
- 8. Week 3 Forma neural tube Brain begins to form Blood vessels connect Heart begins to beat Backbone begins to form
- 9. Week 4 Armbuds develop Backbone curls into a tail 1/5 inch long
- 10. Week 5 Retinaand lens form Ear begins to form 1/4 inch long
- 11. Growth of EmbryoWeek 6 - 5/8 inch long Week 7 - 3/4 inch long Week 8 - 1 inch long Week 9 - 1 1/2 inch long Week 12 - 3 inches long Week 16 - 5 inches long
- 12. Milestones of theembryo Month 4 - Hard bone begins to form Month 5 - Fetus can hear sound Month 7 - Fetus begins to lay down fat deposits under skin and in brain
- 13. Gestation period ofpregnancy Lengths of Gestation in livestock Cow 285 days Sow 114 days Mare 336 days Ewe 147 day
- 14. Parturition birth ofthe fetus Begins with the release of cortisol Cervix relaxes and dilates Oxytocin and estrogen are released to begin labor and milk production
- 15. Parturition (cont) Contractions of the uterus push the fetus through the cervix and down the birth canal out in to the world Fetus must fine the path of least resistance through the pelvic bones The normal presentation for lambs, calves, and foals is front feet first with the head tucked between
- 16. Problems Wrong presentationof fetus Too small pelvic area Too large fetus Placenta does not break Mother does not come to milk
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- 18. After Parturition Afterbirth – the uterus releases the placenta, and it passes out shortly after the fetus is born. ** Retained placenta Lactation – mother making milk for baby Colostrum – mother’s first milk that contains antibodies for the baby; foals die without it, so horse breeders milk mares and freeze it.
- 19. 28 day pigembryo