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Ultrasound intramuscular fat: Difference between revisions
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clicking on the Create button or redlink and reload the page | clicking on the Create button or redlink and reload the page | ||
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[[Category:Carcass Traits]] | |||
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Place brief trait definition/description here | Place brief trait definition/description here | ||
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<!-- Describe ways the phenotype is collected | <!-- Describe ways the phenotype is collected | ||
E.g., for birth weight discuss digital scale, mechanical scale, hoof tape, etc. | E.g., for birth weight discuss digital scale, mechanical scale, hoof tape, etc. | ||
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Percentage of intramuscular fat (% IMF) is correlated with USDA marbling score. A minimum of four independent images should be collected and the resulting % IMF | Percentage of intramuscular fat (% IMF) is correlated with USDA marbling score. A minimum of four independent images should be collected, and the resulting % IMF measurement is the average of the images. The % IMF measurement is made from images that are 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. Ultrasound [https://ultrasoundguidelinescouncil.org/locate-technicians-or-lab/ technicians and image processing labs] should be certified or accredited by the [https://ultrasoundguidelinescouncil.org/ Ultrasound Guidelines Council] (UGC). The UGC standards for certification can be found at https://ultrasoundguidelinescouncil.org/wp-content/uploads/2021/09/UGC-SG-VII-FC.pdf. | ||
===Adjusted Value=== | ===Adjusted Value=== | ||
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If the trait is not adjusted (e.g. Stayability) then say so | If the trait is not adjusted (e.g. Stayability) then say so | ||
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Percentage of intramuscular fat is adjusted to a common age (e.g., 365 days of age) and in | Percentage of intramuscular fat is adjusted to a common age (e.g., 365 days of age), and in multiple-breed settings is also adjusted for breed composition. | ||
===Contemporary Grouping=== | |||
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Discuss how values are adjusted. E.g., 205 day ww, sex X aod adjustments, ratios, etc | |||
If the trait is not adjusted (e.g. Stayability) then say so | |||
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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. | 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. | ||
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E.g., direct, maternal, permanent environment due to dam. | E.g., direct, maternal, permanent environment due to dam. | ||
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Given the ultrasound measure is an indicator of the economically relevant trait of carcass marbling, it is generally included in multiple-trait models that include carcass marbling and potentially other carcass-fat-related traits (e.g., back fat). There are no maternal effects fitted for ultrasound or carcass traits given the maternal influence declines post-weaning. | |||
===Usage=== | ===Usage=== | ||
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Discuss in what circumstances the trait is an ERT or an indicator trait and how the trait should be used and not used. | Discuss in what circumstances the trait is an ERT or an indicator trait and how the trait should be used and not used. | ||
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Most organizations publish only the marbling EPD and not an IMF EPD because IMF is not an ERT. | |||
Latest revision as of 17:08, 21 October 2021
Percentage of intramuscular fat (% IMF) is correlated with USDA marbling score. A minimum of four independent images should be collected, and the resulting % IMF measurement is the average of the images. The % IMF measurement is made from images that are 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. Ultrasound technicians and image processing labs should be certified or accredited by the Ultrasound Guidelines Council (UGC). The UGC standards for certification can be found at https://ultrasoundguidelinescouncil.org/wp-content/uploads/2021/09/UGC-SG-VII-FC.pdf.
Adjusted Value
Percentage of intramuscular fat is adjusted to a common age (e.g., 365 days of age), and in multiple-breed settings is also adjusted for breed composition.
Contemporary Grouping
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
Given the ultrasound measure is an indicator of the economically relevant trait of carcass marbling, it is generally included in multiple-trait models that include carcass marbling and potentially other carcass-fat-related traits (e.g., back fat). There are no maternal effects fitted for ultrasound or carcass traits given the maternal influence declines post-weaning.
Usage
Most organizations publish only the marbling EPD and not an IMF EPD because IMF is not an ERT.
