Estimating fat reserves in Rasa Aragonesa ewes: A comparison of different methods

Mendizábal, J. A.; Delfa, R.; Arana, A.; Eguinoa, P.; González, Carlos; Treacher, T. T.; Purroy, A.

doi:10.4141/a03-035

Cited by 13 publications

(35 citation statements)

References 19 publications

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“…This variable accounted for 63-96% of the variation in carcass tissue weights. These results agree with those found by Delfa et al (1996), Fernández et al (1998), Hopkins (1990), Mendizabal et al (2003) and Silva et al (2005) and Teixeira and Delfa (1997). On the other hand, Ramsey, Kirton, Hogg, and Dobbie (1991) were of the opinion that the improvements in accuracy of prediction due to live weight were not sufficient to warrant the use of this variable in multiple regression equations, which is not in agreement with the results obtained in the present work.…”

Section: Resultssupporting

confidence: 83%

“…Nevertheless, the potential use of this technique to predict the weight of the different tissues of the carcass has been demonstrated by several authors (Delfa, Teixeira, Gonzalez, & Blasco, 1995Fernández et al, 1998;Hopkins, 1990;Kempster, Arnall, Alliston, & Barker, 1982;Mendizabal et al, 2003;Teixeira & Delfa, 1997).…”

Section: Resultsmentioning

confidence: 99%

“…Previous studies with some sheep breeds from Spain have shown the usefulness of ultrasound to predict carcass composition and suggest that ultrasound fat thickness measurements with the live weight, can be good predictors of carcass composition (Delfa et al, 1996;Fernández, García, Vergara, & Gallego, 1998;Mendizabal et al, 2003& Teixeira & Delfa, 1997. Recently, working with the same breed of the present study Cadavez, Teixeira, Delfa, and Rodrigues (2000) and Cadavez et al (2001) have been evaluating of ultrasonic measurements of fat thickness to estimate the carcass composition.…”

Section: Introductionmentioning

confidence: 99%

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In vivo estimation of lamb carcass composition by real-time ultrasonography

et al. 2006

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The objective of this study was to evaluate the accuracy of ultrasonography to measure fat thickness in live lambs and predict carcass composition to find a system that can assess carcass composition easily and accurately, without damage to the product and can improve carcass classification.Fat thickness (FTh) between the 12th and 13th ribs and between the 3rd and 4th lumbar vertebrae, was measured in vivo using realtime ultrasound, in 67 Churra Galega Bragançana males (mean weight 36.0 kg, range 21.5-47.0 kg), using an ALOKA SSD-500V equipped with two probes (5 and 7.5 MHz) in order to predict carcass composition. The most satisfactory correlation between carcass and ultrasound measurements was between the 3rd and 4th lumbar vertebrae fat thickness (FTh). The first variable admitted in the models to predict carcass composition (live weight, LW) explained between 63% and 96% of the total variation of the weight of the components of the carcass. In fact, 96% of the variation in total amount of muscle was accounted for by live weight. The inclusion of the ultrasound measures with the 7.5 MHz probe improved, in all prediction equations, the coefficient of determination (R 2 ) with a substantial reduction in the residual standard deviation (RSD). In relation to the subcutaneous fat of the carcass, 85% of the variation was explained by live weight and the FTh 12-13 7.5 measurement. In the prediction model for total carcass fat weight, live weight and ultrasound fat thickness measurement explained 88% of the variation. The results indicate that in vivo ultrasound fat thickness measures in association with live weight can be used to predict carcass composition in Churra Galega Bragançana lambs.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In vivo estimation of lamb carcass composition by real-time ultrasonography

et al. 2006

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“…Previous studies in Spanish sheep breeds suggest the usefulness of ultrasound fat thickness for predicting carcass composition (Delfa et al, 1996b;Fernández et al, 1998;Mendizabal et al, 2003). Several studies have been published in which new anatomical locations for measuring muscle depth and fat thickness were evaluated to predict the tissue composition of the ovine carcass.…”

Section: Introductionmentioning

confidence: 99%

Estimation of light lamb carcass composition by in vivo real-time ultrasonography at four anatomical locations1

Ripoll

Joy

Álvarez-Rodríguez

et al. 2009

Journal of Animal Science

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“…Adipocyte size was determined by osmium tetroxide fixation and image analysis (Mendizabal et al 2003). The number of adipocytes of the different adipose depots was calculated taking into account the amount of fat in the depot, the amount of chemical fat (Soxhlet method; ISO-1433ISO- -1973, the density of chemical fat (d = 0.915 g. mL -1 ) and the mean cell volume of the adipocytes of each sample, assuming adipocytes to have a spherical shape.…”

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confidence: 99%

Lipogenic activity in Rasa Aragonesa ewes of different body condition score

Arana¹,

Mendizábal²,

Delfa³

et al. 2005

Can. J. Anim. Sci.

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. 2005. Lipogenic activity in Rasa Aragonesa ewes of different body condition score. Can. J. Anim. Sci. 85: 101-105. The aim of the study was to assess the effect of body condition score on tissue and metabolic characteristics of the adipose depots in sheep of Rasa Aragonesa breed. Ewes were uniformly assigned according to their body condition score (BCS) (scale 0 to 5), to four groups: 0.75-1.75, 2-2.75, 3-3.75, and 4-4.5. The amount of fat and the adipocyte size in the different adipose depots increased as BCS did (P < 0.001) while the number of adipocytes did not change. The greatest ability to accumulate or mobilize fat was the subcutaneous depot (slope of the regression between amount of fat and BCS, b = 1.92; P < 0.001). Fatty acid synthase (FAS) lipogenic enzyme activity was affected by BCS, while G3-PDH and G6-PDH activities were not.Key words: Adipose tissue, body condition score, adipocyte size, lipogenic enzyme activity, ewes Arana, A., Mendizabal, J. A., Delfa, R., Eguinoa, P., Soret, B., Alzon, M. et Purroy, A. 2005. Activité lipogénique des brebis Rasa Aragonesa avec différent note d'état corporel. Can. J. Anim. Sci. 85: 101-105. On a etudié l'effet de la note d'état corporel (nCC) sur le metabolisme des differentes dépots adipeux dans les brebis de race Rasa Aragonesa, distribuées dans quatre groups de nCC (échelle 0-5): 0,75-1,75, 2-2,75, 3-3,75, et 4-4,5. La quantité de tissu adipeux et le diamètre des adipocytes des differentes dépots ont augmenté avec la nCC des brebis (P < 0,001) mais il n'a pas eu de variation du nombre des adipocytes. Le tissu adipeux sous-cutané a montré la plus grande capacité d'acumulation/mobilisation (pente de la regression entre la quantité de tissu adipeux et la nCC, b = 1,92; P < 0,001). En ce qui concerne à l'activité des enzymes lipogéniques, uniquement on a trouvé variation de l'activité de l'enzyme FAS Mots clés: Tissu adipeux, note d'état corporel, taille des adipocytes, activité enzymatique lipogénique, brebis Sheep accumulate fat reserves when feed is available in excess and mobilize it when feed is limiting. Fat mobilization occurs mainly over the first period of lactation and the total loss of fat reserves can reach 70% (Cowan et al. 1979). Depending on the production system used, recovery of fat reserves is initiated either after weaning or during the final stage of lactation. Fat accumulation will then take place until mating or even during early gestation. The activity of different lipogenic and lipolytic enzymes is involved in the fat accumulation and mobilization processes. Furthermore, there are changes in adipose tissue cellularity, mainly in adipocyte size, which are achieved by changes in enzyme activity (Vernon 1986).There are different studies of adipose tissue metabolism in sheep either in periods of negative energy balance when fat mobilization occurs (Vernon et al. 1981) or in periods of positive energy balance when fat accretion exists (Sebastian et al. 1993). Nevertheless, the body condition score (range from 0 to 5; Russel et al. 1969) of t...

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Estimating fat reserves in Rasa Aragonesa ewes: A comparison of different methods

Cited by 13 publications

References 19 publications

In vivo estimation of lamb carcass composition by real-time ultrasonography

In vivo estimation of lamb carcass composition by real-time ultrasonography

Estimation of light lamb carcass composition by in vivo real-time ultrasonography at four anatomical locations1

Lipogenic activity in Rasa Aragonesa ewes of different body condition score

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