Introduction To Educational Technology And Computing
Introduction To Educational Technology And Computing EDCI 27000
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This 4 page Class Notes was uploaded by Andreanne Keeling on Saturday September 19, 2015. The Class Notes belongs to EDCI 27000 at Purdue University taught by Staff in Fall. Since its upload, it has received 20 views. For similar materials see /class/207979/edci-27000-purdue-university in Curriculum and Instruction at Purdue University.
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Date Created: 09/19/15
Module 10 Animal Growth and Carcass Composition Student s Objectives This module will provide information on the growth processes and the components of growth This module will include a visit with Dr John Forrest a meats products professor at Purdue University Forthis module referto chapter 9 in pages 173 to 182 of the required text Student Goals 1 To become acquainted with the biological processes of growth and how growth occurs 2 To understand the components of growth in the lifetime of a meat producing animal Growth Growth can occur in different ways Chronological growth refers to increases in size or body function as related to increasing age of an animal On the other hand physiological growth refers to increases in size or body function due to increases in tissue and organ growth and development Within either of these classifications size of the tissue can occur by either hyperplasia which is an increase in the number of cells or by hypertrophy which is an increase in tissue size Two more terms that are commonly used in the growth area are anabolism the building of tissue and catabolism the breakdown oftissue An example of anabolism would be the muscle development resulting from exercise of a racehorse on a properly balanced diet On the other hand an animal fasting would utilize catabolism for muscle development Measures of Growth Several measures of growth can be made In meat animals these include animal weight loin eye area or backfat thickness Or put another way the measurement typically evaluates the edible portion of meat under consideration Linear body measurements weight and age at puberty can be used to assess physiological growth in potential breeding animals Another way to measure growth is by using a simple formula for average daily gain ADG Another important calculation is the feed conversion ratio FCR To calculate the FCR we must first determine ADG using this formula W2W1 t2 t1 Where 39VV2 the ending body weight 39W1 is the initial body weight t2 is the ending feed weight 41 is the feed body weight Example of ADG in swine Keep in mind when calculating ADG you want to express the values on a per animal basis even though animals such as pigs are generally fed on a per pen basis are W1 653 T2 301 day period Calculations 1 Take 301 and divide it by 6 and then by 10 to get that number on a per animal and per day basis 3016 501 50110 0501 This is the average daily feed consumption 2 Take the difference in w2w1 and divide it as you did in Step 1 815653 162 1626 27 2710 027 This is the average daily body weight gain ADG FCR would be 0501027 185 For every 185 pounds of feed these pigs eat they gain 1 pound of body weight 59 Another way to measure growth horses might include height at the withers weight and speed However use of visual appraisal in evaluation of certain traits can also be of value As shown above common measurements of cattle sheep poultry and hogs are average daily gain ADG and weight per day of age eg adjusted 205 day weaning weights in cattle The Growth Curve Growth can be presented by an age growth curve see Figure 91 in your text The curve is generally depicted as an Sshape line where growth rate is reflected by the steepness of the curve The growth curve for most farm animals mammals can be separated into three stages 1 Prenatal growth from conception to birth 2 Preweaning growth from birth to weaning 3 Postweaning growth from meaning to death In poultry the growth curves would be separated into two phases renatal growth from conception to hatch 2 Posthatch growth from hatch to death In commercial poultry the birds are not weaned from a parent Regardless of animal type managers are extremely interested in two major points on the growth curve figure and they are 1 When does the animal begin to tail off in body weight or put another way when does the ADG and FC dictate to process Ave aum ammab mum we a New ammo amundhme awmcssmV amass Eomvosmun m mam mm newsman m m muss vumau vcam s unmade m m bane mg mme mm 5 n mm ms was m We Fm examp e m vmvaman unmade m bane s mm mm mmquot mm s aw mm mm m mmquot mm bane as rmsc e mumcms mum w my ammab m m mwmcMhese vmvamam mm mm svemes ma ammi wve mm mm D moshmva ancesanmcvexedpmvamanm mxscEvaemmmuumma s Vsnanmewebwnhbv Panes a vmvssavmmeavumme vmdu s msmssmn quesmn De ne camvensmawvwmh andeseMasMuahanxuhenns moserKtn mm Multiple Choice andor TrueFalse Review Questions Circle the single best answer for each question The term used to describe an increase in the number of body cells is Hypertrophy B Hyperthermia C Hyperplasia Chronological growth refers to increases in size or body function due to an animal growing older A True B False The rate at which growth occurs is a better measurement of an animal s ability to gain than is weight itself A True B False Weight per day of age is a measure of growth rate and is commonly used when livestock are being raised for breeding purposes A True B False The agegrowth curve or plot of weight versus time is similar for all species of livestock and is best described by a Sshaped curve A True B False The primary hormone that regulates increases in body size is A Testosterone B Thyroxine C Somatotropin High androgen levels initiate muscle development therefore male meat animals typically have more rapid growth rates than females A True B False As an animal grows older and larger the percentage of bone and muscle tissue normally will A Increase B Decrease Fill in the blank Larger type cattle are usually than smaller type cattle at the same age and weight A Fatter B Leaner
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