GROWTH DEV FARM ANIM
GROWTH DEV FARM ANIM ANS 3043
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This 1 page Class Notes was uploaded by Laury Kreiger on Friday September 18, 2015. The Class Notes belongs to ANS 3043 at University of Florida taught by Staff in Fall. Since its upload, it has received 7 views. For similar materials see /class/206674/ans-3043-university-of-florida in Animal Science at University of Florida.
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Date Created: 09/18/15
Notes 6 Early Embryonic Growth I A Introduction 1 period of intense cell division and hyperplastic growth 2 multipotent cells turn into different cell lineages which turn into different body tissues driven by gene expression 3 rate of prenatal growth is related to its postnatal growth rate B Early Embryonic l Fertilization sperm and ovum meet in oviduct to form a zygote 2 Cleavage occurs in the oviduct and is cell division with out the production of proteins and with out an increase in cell mass or cytoplasmic volume Blastomere formation totipotent cells with equal chromosome content Each blastomere has the ability to form a complete individual Growth is under genetic control Nutrition less than day 3 has little embryonic metabolism The ooplasm contains metabolites proteins and glycoprotiens Maternal is undergoing oviduct histotroph which contains metabolites and secretory products Pyruvate is always present through cleavage Glucose is last nutrient or substrate brought in 8 cell embryo C Blastulation cell layer development that occurs in the uterus l Morphogenesis allows for cell layer development a V b O V V Blastocyst increased number of blastomeres creates a hallow ball of cells Trophoblast attened cells that surround the outside of the blastocysts and eventually form the extraembryonic membranes placenta Inner Cell Mass compact cell mass that pushes into the blastocoele accumulation of metabolic products and eventually from the embryo proper Embryonic disc consists of two layers 1 epiblast origin of animal tissue 2 hypoblast formation of extraembryonic membranes
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