Use of X-Ray Computed Tomography (CT) in UK Sheep Production and Breeding

Bünger, L.; Macfarlane, J. M.; Lambe, N. R.; Conington, J.; McLean, KA; Moore, K. L.; Glasbey, C. A.; Simm, G.

doi:10.5772/23798

Cited by 23 publications

(28 citation statements)

References 37 publications

(31 reference statements)

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“…Este modo de análise foi desenvolvido com intenção de maximizar a precisão da leitura além de proceder à análise no menor tempo possível, para minimizar as implicações ao bem estar dos animais (Bünger et al, 2011).…”

Section: Tomografia Computadorizadaunclassified

“…Está análise é feita através do uso de raios-x que geram imagens bidimensionais transversais do corpo, obtidas pela rotação de um tubo de raio-x de 360° em torno do corpo do animal. Após a digitalização da imagem, o objeto (corpo) é dividido em várias seções consecutivas, paralelas e os dados são somados para produzir estimativas totais dos diferentes tecidos da carcaça (Bünger et al, 2011). As imagens geradas são descritas em vários tons de cinza, criando uma imagem espacial do objeto digitalizado (Wegener, 1992).…”

Section: Tomografia Computadorizadaunclassified

“…Os resultados mostraram altas correlações entre as proporções dos tecidos de carcaça, estimadas por TC, quando comparadas à dissecação realizada por técnicos treinados (Sehested, 1986) com menor erro padrão com relação às estimativas realizadas por ultrassonografia, técnica amplamente utilizada na predição de tecido de carcaça até hoje (Anderson et al, 2015). Com a maior disponibilidade do equipamento e evolução do uso da técnica, a TC já tem uma vasta gama de uso em animais, em especial nas análises de animais vivos, para fins de reprodução e avaliação de carcaça post-mortem, processos que já são considerados de rotina em alguns países (Bünger et al, 2011).…”

Section: Tomografia Computadorizadaunclassified

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Avaliação de carcaça ovina por tomografia computadorizada: Estado da Arte no Brasil e no mundo

Geraldo

Quirino

Beltrame

et al. 2017

Pubvet

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RESUMO.Várias técnicas são utilizadas para avaliação da carcaça ovina, com objetivo de avaliar os animais destinados ao abate ou seleção de animais com características de deposição e crescimento tecidual que melhor representem o mercado consumidor. Técnicas como avaliação do ganho de peso, do escore corporal e da ultrassonografia de carcaça são largamente utilizadas na rotina de produção; porém são técnicas sujeitas a muitas variações dependendo dos técnicos que as apliquem, e muitas vezes não apresentam resultados tão exatos como outros métodos mais tecnológicos. O uso da tomografia computadorizada com esse fim ainda está em desenvolvimento no mundo, sendo uma ferramenta altamente precisa para avaliação do crescimento e dos componentes de carcaça de ovinos. Por ser uma análise não invasiva e extremamente acurada, pode apresentar uma importante opção frente aos outros métodos rotineiramente utilizados.Palavras chave: área de olho de lombo, imagem por tomografia, ovinos Lamb carcass evaluation by computed tomography: State of the art in Brazil and in the world ABSTRACT. Different techniques has been used to evaluate the lamb carcass, aiming to slaughter or animal's selection with deposition and tissue growth traits, most preferred by consumer market. The evaluation of the weight gain, body condition score and carcass ultrasound are widely used in production routine , but this techniques are subjective and to many variations occurs depending on who apply them, often do not show accurate results as other more technology methods. The computed tomography scans (CT) for this purpose is still in progress around the world, being a precise tool for evaluating the growth and sheep carcass components. It is a non-invasive and highly accurate analysis, can provide an important option compared to the other methods routinely used.Keywords: rib eye area, sheep, topographic image Evaluación de la canal ovina por tomografía computadorizada: Estado del arte en Brasil y en el mundo RESUMO. Varias técnicas son utilizadas para la evaluación de la canal ovina, con objetivo de evaluar los animales destinados al sacrificio o selección de animales con características de deposición y crecimiento de tejido que represente mejor el mercado consumidor. Técnicas como evaluación de la ganancia de peso, de clasificación corporal y de

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Section: Tomografia Computadorizadaunclassified

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Avaliação de carcaça ovina por tomografia computadorizada: Estado da Arte no Brasil e no mundo

Geraldo

Quirino

Beltrame

et al. 2017

Pubvet

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“…All lambs were spiral CT scanned (Navajas et al, 2006;Bunger et al, 2011). Two spiral scans were taken: one from the proximal third of the tibia to the last rib and the second from the last rib to the fourth to fifth cervical vertebra.…”

Section: -Born Animals Their Management and Genotypesmentioning

confidence: 99%

Effect and mode of action of the Texel muscling QTL (TM-QTL) on carcass traits in purebred Texel lambs

Macfarlane

Lambe

Matika

et al. 2014

animal

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TM-QTL is a quantitative trait locus (QTL) on ovine chromosome 18 (OAR18) known to affect loin muscling in Texel sheep. Previous work suggested that its mode of inheritance is consistent with paternal polar overdominance, but this has yet to be formally demonstrated. This study used purebred Texel sheep segregating for TM-QTL to confirm its presence in the chromosomal region in which it was first reported and to determine its pattern of inheritance. To do so, this study used the first available data from a Texel flock, which included homozygote TM-QTL carriers (TM/TM; n = 34) in addition to homozygote non-carriers (+ / + ; n = 40 and, heterozygote TM-QTL-carriers inheriting TM-QTL from their sire (TM/ + ; n = 53) or their dam (+ /TM; n = 17). Phenotypes included a wide range of loin muscling, carcass composition and tissue distribution traits. The presence of a QTL affecting ultrasound muscle depth on OAR18 was confirmed with a paternal QTL effect ranging from + 0.54 to + 2.82 mm UMD (s.e. 0.37 to 0.57 mm) across the sires segregating for TM-QTL. Loin muscle width, depth and area, loin muscle volume and dissected M. longissimus lumborum weight were significantly greater for TM/ + than + / + lambs (+2.9% to + 7.9%; P < 0.05). There was significant evidence that the effect of TM-QTL on the various loin muscling traits measured was paternally polar overdominant ( P < 0.05). In contrast, there was an additive effect of TM-QTL on both live weight at 20 weeks and carcass weight; TM/TM animals were significantly ( P < 0.05) heavier than + / + (+11.1% and + 7.3%, respectively) and + /TM animals (+11.9% and + 11.7%, respectively), with TM/ + intermediate. Weights of the leg, saddle and shoulder region (corrected for carcass weight) were similar in the genotypic groups. There was a tendency for lambs inheriting TM-QTL from their sire to be less fat with slightly more muscle than non-carriers. For example, carcass muscle weight measured by live animal CT-scanning was 2.8% higher in TM/ TM than + / + lambs ( P < 0.05), carcass muscle weight measured by carcass CT-scanning was 1.36% higher in TM/ + than + / + lambs ( P < 0.05), and weight of fat trimmed from the carcass cuts was significantly lower for TM/ + than + / + lambs (−11.2%; P < 0.05). No negative effects of TM-QTL on carcass traits were found. Optimal commercial use of TM-QTL within the sheep industry would require some consideration, due to the apparently different mode of action of the two main effects of TM-QTL (on growth and muscling).

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“…Applications to meat production deal mostly with estimation of proportions of muscle, fat and bone from CT images, both in vivo and in carcasses, sometimes involving the segmentation of internal organs without distinguishing them individually [8,2]. Work dealing with localisation of individual organs from photography or video is scarce and includes the segmentation of poultry spleen from surrounding viscera in the work of Tao et al [11], as a stage in the automated detection of splenomegaly from ultraviolet and colour images.…”

Section: Introductionmentioning

confidence: 99%

Segmentation of organs in pig offal using auto-context

Amaral

Kyriazakis

McKenna

et al. 2016

2016 IEEE 13th International Symposium on Biomedical Imaging (ISBI)

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The segmentation of 2D images of 3D non-rigid objects into their constituent parts can pose challenging problems, such as missing and occluded parts, weak constraints over the spatial arrangement of parts, and variance in form and appearance. These problems have been addressed via segmentation methods that incorporate spatial context information, such as the auto-context technique. In this paper, we address for the first time the problem of segmenting multiple organs in images of pig offal, a challenging image analysis task that constitutes an essential step towards automated screening at abattoir for signs of sub-clinical diseases. We applied auto-context segmentation to a large data set of images and explored the effect of complementing conventional context features with integral features suited to our application.

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Use of X-Ray Computed Tomography (CT) in UK Sheep Production and Breeding

Cited by 23 publications

References 37 publications

Avaliação de carcaça ovina por tomografia computadorizada: Estado da Arte no Brasil e no mundo

Avaliação de carcaça ovina por tomografia computadorizada: Estado da Arte no Brasil e no mundo

Effect and mode of action of the Texel muscling QTL (TM-QTL) on carcass traits in purebred Texel lambs

Segmentation of organs in pig offal using auto-context

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