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Ultrasound intramuscular fat: Difference between revisions

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Percentage of intramuscular fat is adjusted to a common age (e.g., 365 days of age) and in multi-breed settings is also adjusted for breed composition.
Percentage of intramuscular fat is adjusted to a common age (e.g., 365 days of age) and in multi-breed settings is also adjusted for breed composition.


===Contempory Group===
 
<!-- Discuss how contemporary groups are formed -->
Animals of the same  sex,  reared  and  managed  together  up  until  the  time  of  scanning  form  a contemporary group.  Scanning  contemporary group  definition  includes  the  following:  herd  code,  weaning  date, weaning  management  group  (pasture,  creep,  non-creep,  etc.), scanning  date,  and  post-weaning  management  group  designation.  For  animals  scanned  at  a  central  test,  the  contemporary group  definition  for  an  animal should  include its  herd  of  origin  and  other  birth  and  weaning  contemporary  group information.


===Genetic Evaluation===
===Genetic Evaluation===

Revision as of 20:39, 9 December 2019


Phenotype

Percentage of intramuscular fat (% IMF) is correlated with USDA marbling score. A minimum of four independent images should be collected and the resulting % IMF predictions averaged for this trait. The  % IMF measurement is made from an image that is collected across the 11th-13th ribs (or 12th-13th ribs) at a lateral position from the animal’s midline at a point three fourths of the distance from the medial end of the longissimus dorsi muscle.

Adjusted Value

Percentage of intramuscular fat is adjusted to a common age (e.g., 365 days of age) and in multi-breed settings is also adjusted for breed composition.


Animals of the same sex, reared and managed together up until the time of scanning form a contemporary group. Scanning contemporary group definition includes the following: herd code, weaning date, weaning management group (pasture, creep, non-creep, etc.), scanning date, and post-weaning management group designation. For animals scanned at a central test, the contemporary group definition for an animal should include its herd of origin and other birth and weaning contemporary group information.

Genetic Evaluation

Usage