The use of ultrasound to predict the carcass composition of live Akkaraman lambs

Şahin, Emine; Yardimci, Mehmet; Çetingül, İbrahim Sadi; Bayram, İsmail; Şengör, Erol

doi:10.1016/j.meatsci.2007.11.003

Cited by 31 publications

(23 citation statements)

References 19 publications

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“…Correlation in Table 2 involving LMA were somewhat smaller than reported values of 0.88 (Fernández et al, 1997), 0.70 (Hiemke et al, 2004), 0.95 (Silva et al, 2006), 0.75 (Leeds et al, 2008b), and 0.82 (Sahin et al, 2008). The strong correlation reported by Silva et al (2006) is interesting because of the amount of tissue distortion visible in their representative images and attributable to the absence of a standoff pad.…”

Section: Correlation Analysis Of Ultrasound and Carcass Measurementsmentioning

confidence: 58%

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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 Measurementsmentioning

confidence: 58%

“…Most recent studies (e.g., Tait et al, 2005;Sahin et al, 2008;Leeds et al, 2008b) report correlation coefficients between ultrasonic predictors and actual carcass measures in the range of 0.72 to 0.81 for backfat thickness (BF) and 0.75 to 0.88 for loin muscle area (LMA).…”

Section: Introductionmentioning

confidence: 99%

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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“…O tratamento OSC apresentou EGS semelhante (P > 0,05) aos demais tratamentos experimentais. A gordura de cobertura determinada por ultrassom entre a 12 a e 13 a costelas, quando associada com o peso corporal do animal pode ser utilizada para estimar a proporção de gordura corporal total em ovinos (TEIXEIRA et al, 2006;SAHINA et al, 2008).…”

Section: Fonte: Elaboração Dos Autoresunclassified

Medidas repetidas no tempo realizadas por ultrassom em ovelhas de descarte em diferentes estágios fisiológicos

et al. 2014

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ResumoMonitoraram-se algumas medidas realizadas no Longissimus dorsi entre a 12 a e 13 a costelas por ultrassom, com objetivo de conhecer as mudanças que ocorrem com os tecidos muscular e adiposo neste músculo e a relação destas medidas com o peso corporal (PC) e com o escore de condição corporal (ECC) de ovelhas em diferentes fases (estágios fisiológicos e períodos experimentais). As ovelhas foram distribuídas nos respectivos tratamentos: OL = ovelhas que permaneceram por 60 dias em lactação com seus respectivos cordeiros e abatidas um dia após o desmame dos mesmos; OSC = ovelhas que permaneceram por 60 dias em lactação com seus respectivos cordeiros e mais um período de 30 dias sem os cordeiros e posteriormente foram abatidas; ONP = ovelhas que não pariram durante o ano. As medidas por ultrassom foram realizadas no início, no meio e no fim do trabalho (períodos experimentais de 21 dias cada), assim como o PC e a ECC das ovelhas. Não houve interação entre os períodos e tratamentos experimentais para o PC e para a ECC das ovelhas. Concluiu-se que a utilização do ultrassom permite monitorar as mudanças que ocorrem com a gordura subcutânea e com o Longissimus dorsi de ovelhas. Mudanças estas que ocorrem com uma frequência maior em intervalos de 42 dias entre avaliações dos tecidos muscular e adiposo. Palavras-chave: Área de olho de lombo, condição corporal, espessura de gordura subcutânea, ovinos, peso corporal AbstractSome measurements carried out by ultrasound in the Longissimus dorsi between the 12th and 13th ribs were monitored, aiming to know the changes in the muscular and adipose tissues in that muscle and the connections of these measurements with body weight (BW) and body condition score (BCS) of ewes in different stages (physiological stages and experimental periods). Ewes were arranged into the following treatments: EL = ewes which remained in lactation for 60 days with their respective lambs and slaughtered one day after weaning; EWL = ewes which remained in lactation for 60 days with their respective lambs and one more period of approximately 30 days without the lambs and slaughtered afterwards; and ENC = ewes which did not give birth during the year. Ultrasound measurements were

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“…There are high phenotypic correlation coefficients between MLD and backfat thickness using ultrasound in live animals compared to the objective measurements examined from the carcass after slaughter (Fernandez et al, 1997;Fernandez et al, 1998). In this respect, ultrasound technology is becoming increasingly important to estimate these parameters (Sahin et al, 2008;Ekiz et al, 2009;Lambe et al, 2009a;Lambe et al, 2009b).…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Carcass Assessment of Dorper and Dorper x Merino Lambs Using MLD and Body Measurements

Yılmaz

Ocak

Ogun³

2016

Turkish JAF Sci.Tech.

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Ultrasonic measurements of Musculus longissmus dorsi thoracis et lumborum (MLD)were taken of Dorper (n=99) and Dorper x Merino (n=65) lambs at 156 days of age and comparisons made to various body dimensions to ascertain whether sex, genotype, birth type and live weight had any effect on these parameters. Lambs were weaned two months after birth and placed ad libitum on basic dry land pasture during the draught spring and summer months of 2014 in the arid southeastern region of Turkey. Least square means of backfat thickness, skin+backfat thickness, muscle depth, body length, chest girth and live weight, at the mean age of 156 days, were 0.17 cm, 0.32 cm, 1.75 cm, 63.30 cm, 72.37 cm and 25.16 kg, respectively. Genotype was a statistically significant factor in terms of back fat thickness (BFT), skin and backfat thickness (S+BFT), muscle depth (MD), body length (BL) and live weight (LW). The study showed that Dorper and Dorper x Merino genotypes into Turkey show a clear advantage over the native breeds in terms of meat production and quality not to mention the high potential for lean carcass production. Ultrasonic measurements of Longissimus thoracis et lumborum (MLD) will provide an important contribution to selection index in breeding programs for Dorper and Dorper crossbred genotypes. However estimation of genetic parameters are required in containing a pedigree database in order to establish an effective selection index.

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The use of ultrasound to predict the carcass composition of live Akkaraman lambs

Cited by 31 publications

References 19 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

Medidas repetidas no tempo realizadas por ultrassom em ovelhas de descarte em diferentes estágios fisiológicos

Ultrasonic Carcass Assessment of Dorper and Dorper x Merino Lambs Using MLD and Body Measurements

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