ANS3319CFetalGrowth_Notes_Final_Topic15

ANS3319CFetalGrowth_Notes_Final_Topic15 - ANS 3319C...

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ANS 3319C Reproductive Physiology and Endocrinology Fetal Development 141 Fetal Growth, Development, and Physiology 1) Fetal nutrition ____________________________________________________________________________ __________________________________________________________________________ Diet (% of total diet) ____________________ _______________________________________________________________________ Regulation: _____________________________________ Excess Glucose: ____________________________________________________ _________________________________________________________________________ ______________________________________________________________________ _________________________________________________________________________ ______________________________________________________________________ _________________________________________________________________________ _______________________________________________________________________ ____________________________________________________________________ ____________________________________________________ _______________________________________________________________________ ____________________________________________________________________ 2) Fetal blood circulation Placental & fetal single system (Fetal Heart) Blood shunted from lungs & liver (not in postnatal) Ductus venosus : away from liver (NO: pigs & horses) Foramen ovale : from right atrium to left atrium Ductus arteriosus : away from lungs to descending aorta
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ANS 3319C Reproductive Physiology and Endocrinology Fetal Development 142 Normal Adult Circulation (No shunts)
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143 ___________________________________________________________________________ ___________________________________________________________________________ Sheep: 170 – 220 bpm Cattle: 120 – 140 bpm Fetal Circulation (With shunts)
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ANS 3319C Reproductive Physiology and Endocrinology Fetal Development 144 Gastrointestinal system: little function Renal system: little function Respiratory system ________________________________________________________________________ _____________________________________________________________________ Endocrine system: functional last ¼ of gestation Fetus modulates mineral metabolism Adrenal gland initiates parturition (most farm animals) 3) Conceptus growth: general characteristics ___________________________________________________________________________ ___________________________________________________________________________ ________________________________________________________________________ _____________________________________________________________________ Relationship between fetal weight & length with stage of gestation ________________________________________________________________________ ________________________________________________________________________ Fetus and Placental Membrane Size in the Bovine Fetal Size Gestation (days) Weight (gm) Length (cm) Fetal Membranes (gm) 0 - 30 .5 1.3 4.5 31 – 60 5.9 2.5 49.5 61 – 90 72.6 6.5 - 12 149.8 91 – 120 531.4 12 – 21 258.8
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ANS3319CFetalGrowth_Notes_Final_Topic15 - ANS 3319C...

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