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Chapter 18-Growth and Development

Chapter 18-Growth and Development - GROWTH DEVELOPMENT What...

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GROWTH & DEVELOPMENT What is Growth? 1. Growth a. An ↑ in body weight until mature size is reached b. Result of ↑ in cell size & cell numbers w/ protein deposition resulting c. An ↑ in mass of structural tissue bone, muscle, connective tissue i. Change in body form & composition 2. Development a. Directive coordination of all diverse processes until maturity is reached Prenatal (Livestock) 1. Three Phases a. Sex Cells b. Embryo c. Fetus 2. Greatest ↑ in Prenatal Weight? a. Last trimester of pregnancy 3. Hyperplasia a. ↑ in number of fibers b. Causes ↑ in muscle weight 1. During 1 st 2/3 of prenatal period 4. Hypertrophy a. ↑ in size of fibers b. Represents most muscle growth 1. Last several months of pregnancy & postnatal Birth (Livestock) 1. Birth weight = 5-7% mature weight 2. Birth leg length = 60% mature 3. Birth height = 50% mature 4. Distal parts (legs & shoulder height) are more developed than proximal parts (hips and chest) Poultry 1. Embryonic Development a. Blastroderm i. A germ spot in every egg—fertile or unfertile 1. where chick embryo develops if fertile egg is properly incubated b. Allantois i.
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