Ultrasonic Application for Estimating Fat Thickness of Beef Cattle

McReynolds, William E.; Arthaud, V. H.

doi:10.2527/jas1970.302186x

Cited by 2 publications

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“…±2 cm). McReynolds & Arthaud (1970) reported a decline in correlation between carcass fat thicknesses over the 12-13th rib and ultrasonic readings taken 13, 9 and 5 cm from the midline but these represent a very large (8 cm) variation in site.…”

Section: Effect Of Sitementioning

confidence: 92%

“…Estimates obtained from a variety of point reading instruments have generally been relatively inaccurate using either a fixed distance from the midline (McReynolds & Arthaud, 1970) a varying distance from the midline (Scully & McKeown, 1979) or an unspecified site (Gillis et al 1973). However, Graham, Saul & Spiker (1980) obtained similar accuracy of estimation at the 12th intercostal space to that reported by others for the scanning technique but they did not specify the lateral location of the site and included only data which were duplicated by two operators.…”

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The relationship between ultrasonic point readings in live cattle and carcass fat cover

Greathead

Barker

1984

J. Agric. Sci.

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Four inexperienced operators used a Smith's Essem Metatest ultrasonic grader and a Philips Sonatest instrument to estimate the thickness of tissue overlying the M. longissimus dorsi at three sites over the tenth intercostal space of live steers. They also measured skin fold thickness over the central site using a micrometer. Suprafascial (selvedge) and total carcass fat were measured at corresponding sites on the chilled carcasses.The residual standard deviations from multiple and simple regressions of suprafascial and total carcass fat thickness on the ultrasonic readings of different operators, using both instruments over the three sites with and without a measurement of skin thickness were compared.The following conclusions were drawn. Use of a constant distance from the midline of the live animal to locate the site for ultrasonic point measurement would lead to errors in estimating fat thickness at a specific anatomical location. If the edge of the M. 1. dorsi is palpated to locate the measurement site, estimates of carcass fat thickness with a residual standard deviation of 2-5 mm are possible by relatively inexperienced operators using single point reading ultrasonic instruments. Fat deposition between the fascial sheath and the underlying M. 1. dorsi is a source of inaccuracy when estimating carcass fat cover particularly at sites closer to the midline and on fatter animals.Using the Metatest instrument, fat cover could bo estimated in the live animal with an accuracy similar to that reported by other workers using the Scanogram. Using the Sonatest instrument the estimates were generally slightly less accurate especially at the most lateral site. Inclusion of a measurement of skin thickness gave a very slight but consistent improvement in accuracy of estimation of carcass fat cover.

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Section: Effect Of Sitementioning

confidence: 92%

mentioning

confidence: 99%

The relationship between ultrasonic point readings in live cattle and carcass fat cover

Greathead

Barker

1984

J. Agric. Sci.

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Some factors affecting reproducibility in ultrasonic scanning of animals 1. Cattle

Miles¹,

Pomeroy²,

Harries³

1972

Anim. Sci.

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SUMMARYSix Hereford and Shorthorn cross steers were ultrasonically scanned in parallel planes perpendicular to the spine. Scanning was performed at the level of each vertebra and extended from the head of the 9th rib to the articulation of the 3rd and 4th lumbar vertebrae. Scans of each live animal were compared with those of its hot carcass and related to dissected sections of the frozen carcass. In general, the difference between an ultrasonic estimate and the carcass measurement was found to depend on the anatomical parameter being investigated, the location on the animal at which measurement was made and the individual interpreting the scan. Results are presented for fat thickness, Mm. longissimi thoracis et lumborum depth, ‘A’, ‘B’ and area measurements. Possible explanations for some discrepancies between the ultrasonic and carcass measurements are discussed.Additional results showed that whilst judges are consistent within themselves, in general their interpretations of ultrasonic scans differ significantly from each other.

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Ultrasonic Application for Estimating Fat Thickness of Beef Cattle

Cited by 2 publications

References 0 publications

The relationship between ultrasonic point readings in live cattle and carcass fat cover

The relationship between ultrasonic point readings in live cattle and carcass fat cover

Some factors affecting reproducibility in ultrasonic scanning of animals 1. Cattle

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