Objective Evaluation of Meat Animals Flashcards
what is needed to predict cutability
amount of subQ fat
amount of muscle
how accurate is antemortem evaluation for quality and yield grade
60%
what can be used to measure subQ fat on a living animal
ultrasounds
optical probe types
Hennessy grading probe
fat-o-meter
how do optical probes work
reflects off fat and muscle and detects different colors
when would optical probes not provide proper information
on PSE meat since there’s not much differentiation in color
how are ultrasonics used for carcasses
similar to live animals, hide still on
objective determination of whole body composition of live animals
Antipyrine
Anesthetic
K40 counter
D2O/deuterium oxide
scanning technologies
antipyrine uses to determine body composition
injected into animal and spreads uniformly into body water where a sample is taken. more water = less fat
anesthetic uses to determine body composition
anesthetics are preferentially absorbed into fat. fatter animals sleep less than lean animals
K40 uses to determine body composition
all K in animals is in muscle
K40 is radioisotope of potassium
K:K40 ratio is constant
deuterium oxide uses to determine body composition
predicts water to predict muscle(similar to antipyrine)
scanning technology uses to determine body composition
CT and MRIs to view composition
issues using scanning technologies on live animals
-hard to keep animals still
-must make sure they have not swallowed any metal
objective determination of whole body composition of carcasses
Total body electrical conductivity
video image analysis
total body electrical analysis(ToBEC)
electrical current through animal, less current through fat animals
what industry heavily uses ToBEC
pork industry
Video Image Analysis
camera + computer + digitizer, takes picture and analyzies yield/quality grade
what countries use video image analysis for cutability assessment
US and Australia
what information does VIA provide
ribeye area
fat thickness
color
marbling
equation for whole body specific gravity
(weight in air/weight in air-weight in water) x 100
what does specific gravity tell about composition
high specific gravity = lean
low = fat
