M. Longissimus Area of Lamb Carcasses—A Comparison of Four Measurement Techniques and the Evaluation of Operator Differences

Rust, R. E.; Olson, D. G.; Kratzer, Dillard Dal; Schuler, R. O.; Vetter, R. L.

doi:10.2527/jas1970.30136x

Cited by 7 publications

(4 citation statements)

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“…The potential for error resulting from the relative lack of precision of the loin muscle grid, improper ribbing of carcasses or bilateral asymmetry has been of some concern (Rust et al, 1970). The only other study measuring CLMA with a grid (Notter et al, 2004) reported a smaller correlation between ULMA and CLMA (r = 0.51) than ours.…”

Section: Correlation Analysis Of Ultrasound and Carcass Measurementscontrasting

confidence: 53%

Validation of live animal ultrasonic measurements of body composition in market lambs

Emenheiser

Greiner

Lewis

et al. 2010

Journal of Animal Science

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Market lambs from the state fair of Virginia (n = 172) were ultrasonically evaluated by 4 scan technicians and 3 image interpreters to determine accuracy of ultrasonic estimates of loin muscle area (ULMA), backfat thickness (UBF), and body wall thickness (UBW). Lambs were initially scanned at the preferred magnification setting of each technician; 2 chose 1.5× and 2 chose 2.0×. Lambs were then scanned a second time for ULMA and UBF with machine magnification settings changed from 1.5 to 2.0×, or vice versa, midway through the second scan. Lambs were then slaughtered, and analogous measurements [carcass loin muscle area, carcass backfat thickness, and carcass body wall thickness (CBW)] were recorded on chilled carcasses. Pooled, residual correlation coefficients within technicians and interpreters between ultrasonic measurements from the first scan and carcass measurements were 0.66 for loin muscle area, 0.78 for backfat thickness, and 0.73 for body wall thickness, but were reduced to 0.43, 0.69, and 0.50, respectively, by inclusion of linear effects of carcass weight in the model. Mean bias for technicians and interpreters ranged from −1.30 to −2.66 cm 2 for loin muscle area, −0.12 to −0.17 cm for backfat thickness, and 0.14 to −0.03 cm for body wall thickness; prediction errors ranged from 1.86 to 2.22 cm 2 , 0.12 to 0.14 cm, and 0.35 to 0.38 cm, respectively. Pooled correlations between repeated measures were 0.67 for ULMA, 0.79 for UBF, and 0.68 for UBW at the same magnification and 0.73 for ULMA and 0.76 for UBF across different magnification settings. Mean differences between repeated measures were more variable among technicians and interpreters than statistics comparing ultrasound to carcass measures. Standard errors of repeatability ranged from 1.61 to 2.45 cm 2 for ULMA, 0.07 to 0.11 cm for UBF, and 0.36 to 0.42 cm for UBW. The effect of changing magnification setting on technician and interpreter repeatability was small for UBF and ULMA. The accuracy of prediction of CBW from UBW was similar to that achieved for backfat thickness; further assessment of the value of ultrasonic measurements of body wall thickness in lambs is warranted. These results indicate that ultrasound scanning can reliably predict carcass loin muscle area and backfat thickness in live lambs and, accordingly, has value in selection programs to improve composition. Development of certification standards for US lamb ultrasound technicians based on results of this study and others is proposed.

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Section: Correlation Analysis Of Ultrasound and Carcass Measurementscontrasting

confidence: 53%

Validation of live animal ultrasonic measurements of body composition in market lambs

Emenheiser

Greiner

Lewis

et al. 2010

Journal of Animal Science

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“…Incisions at the 6th and 13th rib were done to measure dorsal fat thickness by using a ruler in a perpendicular position with relation to external surface of the carcass at 6 cm from the dorsal apophysis of the vertebra (Colomer-Rocher, 1984). For the 13th rib, the LD muscle area was measured using the cross-sectional method described by Rust et al (1970).…”

Section: Post-mortem Sampling and Data Recordingmentioning

confidence: 99%

Effects of feed supplementation of zilpaterol hydrochloride on growth performance and carcass traits of finishing lambs

Mondragón

Vara

Pinos-Rodríguez

et al. 2010

Acta Agriculturae Scandinavica, Section A - Animal Science

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Effects of zilpaterol hydrochloride (ZH) on growth performance trial (30-day period), and carcass traits of finishing lambs were evaluated. Twenty-eight male Rambouillet lambs (32.792.6 kg body weight) were randomly assigned to diets with: 0, 5.3, 10.6, and 15.9 mg ZH/kg dry matter (DM). Average daily weight gain, hot and chilled carcass dressing, muscle conformation, hindquarters width, major and minor torax width, crude protein, and ash of Longissimus dorsi (LD) increased linearly as ZH level increased. Feed conversion was linearly improved, and perirenal fat, leg length, and fat of LD were linearly reduced as ZH level increased. Hot and chilled carcass dressing, dorsal fat, area, and sherar forces values of LD, were cubically affected by ZH level, which at 15.9 mg/kg DM offered the best values. The ZH supplementations at 15.9 mg/kg DM showed positive effects on growth performance and carcass traits.

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“…Carcase conformation, fatness degree, and perirenal fat measurements were based on a photographic reference diagram and assessed following Colomer-Rocher method (Colomer-Rocher 1984). Incisions at 12th rib were done to measure the backfat thickness with a digital Vernier (Rust et al 1970). Liver (150 g) and rib bone (100 g) samples were collected to determine Fe, Cu, Cr and Zn concentration (Table 4) by atomic absorption spectroscopy (Perking Elmer, 3110) (Fick et al 1979).…”

Section: Post-mortem Evaluationmentioning

confidence: 99%

Effects of dietary chromium-yeast level on growth performance, blood metabolites, meat traits and muscle fatty acids profile, and microminerals content in liver and bone of lambs

Moreno-Camarena

Vara

Morales-Almaráz

et al. 2020

Italian Journal of Animal Science

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M. Longissimus Area of Lamb Carcasses—A Comparison of Four Measurement Techniques and the Evaluation of Operator Differences

Cited by 7 publications

References 0 publications

Validation of live animal ultrasonic measurements of body composition in market lambs

Validation of live animal ultrasonic measurements of body composition in market lambs

Effects of feed supplementation of zilpaterol hydrochloride on growth performance and carcass traits of finishing lambs

Effects of dietary chromium-yeast level on growth performance, blood metabolites, meat traits and muscle fatty acids profile, and microminerals content in liver and bone of lambs

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