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AU - SCI 1000 - Class Notes - Week 8

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AU - SCI 1000 - Class Notes - Week 8

School: Auburn University
Department: Science
Course: Introduction to Animal Sciences
Professor: Alese Parks
Term: Fall 2016
Tags: ANSC, animal, and Science
Name: ANSC 1000 Exam 2 Lecture 1 Week 5
Description: These notes cover the first part of growth and development
Uploaded: 09/19/2016
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background image ANSC 1000 Exam 2 Lecture 1  9-14-16  Growth and Development  Why study growth and development?    To gain an understanding as to how to improve the efficiency of food  conversion in livestock production 
    FE is highly associated with the body composition of the animal and the  particular stage of growth for bone, muscle, and fat deposition 
  Desired Livestock               Market Hog Performance  Market Steer Performance    1950  Present  1950  Present  Market  Weight (lbs)  200-210  250-280  850-1100  1100-1300 
background image Average  Daily Gain  (lbs)  1.3-1.6  1.7-2.1  1.8-2.5  2.5-3.5  Feed  Efficiency  (lbs feed/lb  gain)  3.7-4.2  2.6-3.3  8.5-10.5  6.0-8.5  Fat  Thickness  (in.)  1.6-1.8  0.5-0.9  0.6-1.0  0.3-0.6  Loin muscle 
area (sq. in) 
3.3-3.7  5.5-9.0  8-10  11-14  Day to 230  200-210  140-170  24-36  14-24    What is growth?    True growth is an increase in body weight until mature size is reached  o  An increase in cell size 
o  An increase in cell number 
o  An increase in mass of bone, muscle, fat, and connective tissue 
  This does not include excess fat deposition (fattening)  What is development?    Directive coordination of all diverse processes until maturity is  reached  o  Growth  
o  Cellular differentiation 
o  Alternations in body shape and form 
We Don’t Know..    Why growth starts 
  How it is regulated entirely 
  Why it stops 
  In the body, genetics (DNA) is the ultimate regulator 
background image o  Cell size and numbers are regulated to reach genetically  determined values.    Example: cut out a piece of liver; it quickly grows back to  its original size and stops. Why? Some inhibitory 
mechanism stops the growth 
Growth Occurs Two Ways    Hyperplasia (increase in the cell number)  o  This occurs before birth except for:    Some adipose cells – they continue to divide and get new  cells for a while after birth    Skin – slough (shedding) cells; repair wounds 
  Intestinal lining 
  Blood cells 
  Most of these really are not new growth but a 
replacement of existing cells; however, cut or destroy 
brain and muscle cells and they are not replaced  
  Hypertrophy (increase in cell size)  o  Muscle cells – all are present at birth 
o  Nerve cells – all are present at birth 
o  Most adipose cells – most are present at birth 
Prenatal Growth    Endoderm – Gastrointestinal (GI) tract, lungs, bladder 
  Mesoderm – skeleton, skeletal muscles, cardiac muscles 
  Ectoderm – skin, hair, brain, spinal cord 
  DNA chains of chromosomes direct: 
o  Growth 
o  Development 
o  Differentiation process (protein synthesis) 
  Nucleus is the center of this process     
background image Cell Types      White blood cells 
  Fat cells 
  Bone cells 
  Intestinal epithelial cells 
  Nerve cells 
  Skeletal muscle cells 
Fetal Growth    Marked changes in shape and form 
  Early in the prenatal period, the head is larger than the body 

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School: Auburn University
Department: Science
Course: Introduction to Animal Sciences
Professor: Alese Parks
Term: Fall 2016
Tags: ANSC, animal, and Science
Name: ANSC 1000 Exam 2 Lecture 1 Week 5
Description: These notes cover the first part of growth and development
Uploaded: 09/19/2016
13 Pages 17 Views 13 Unlocks
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  • Notes, Study Guides, Flashcards + More!
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