Abstract
The aim of this study was to characterise ultrasound measurements of live and carcass traits in intact males, females and castrated Tswana goat kids from birth to 12 months of age raised under semi-intensive system in South-eastern Botswana. Measurements were recorded in 15 castrates, 15 intact males and 15 female Tswana goat kids randomly selected at birth. Ultrasonic fat and muscle depths were measured at the first, third/fourth, sixth/seventh, ninth/tenth and 12th/13th thoracic; first, third and fifth lumbar and first, second/third and fourth/fifth sternal vertebrae, fortnightly for the first 6 months and then monthly for the remaining 6 months. The animals were stunned and humanely slaughtered at 12 months of age, and ultrasound and shatterproof ruler were used to measure fat and muscle depths on the carcasses at similar sites as on live animals. A real-time B-mode ultrasound scanner fitted with LV2-1 probe operating at 7.5 MHz (Explorer V5 Vet Laptop B-Ultrasonic Scanner UMC Technology Development Co., Ltd, China) was used to predict ultrasound measurements on live animals and their carcasses. Data were analysed using general linear model in statistical analysis system. Muscle depth measurements increased significantly (p < 0.05) with age in all sites of measurements. However, there was no significant difference between the sexes at different sites of muscle depth measurements at the same age. Muscle depth at the sternal vertebrae was significantly deeper (almost 55 mm at 12 months of age) than 16 mm at thoracic and 16 mm at lumbar vertebrae at 12 and 8 months of age, respectively. No subcutaneous fat depth measurements were recorded in the lumbar vertebrae (0.00 ± 0.00) and the thoracic (0.00 ± 0.00) regions in all sex groups. However, fourth and fifth sternal vertebrae showed considerably deeper amount of subcutaneous fat suitable for taking fat measurements as age increases (2.07 ± 0.23 mm females, 1.50 ± 0.43 mm intact males and 1.80 ± 0.38 mm castrates) at 12 months of age. All correlations between live and carcass ultrasound measurements and also between ultrasound carcass and ruler measurements were very high (r 2 = 0.96 to 1.00) for all the sexes indicating that live ultrasound measurements are suitable for use in this meat breed. More research is needed to evaluate the relationships between live ultrasonic measurements and carcass yield in the different sexes of Tswana goat kids.
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References
Aganga, A.A., and Sera, S.K., 2010. Performance of Tswana weaner goats under semi-intensive management in Gaborone Botswana. Botswana Journal of Agriculture and Applied Sciences, Special Issue, 6, (3), 111–113.
Alexandre G., Limèa L., Fanchonne A., Coppry O., Mandonnet N. and Boval M., 2009. Effect of forage feeding on goat meat production: Carcass characteristics and composition of Creole kids reared either at pasture or indoors in the humid tropics, Asian-Australian Journal of Animal Sciences, 22, (8), 1140–1150.
Butterfield, R.M., 1988. New concepts of sheep growth. University of Sidney Press, Sydney, Australia, pp 168.
Chowdhury, S.A. & Faruque, S., 2004. Meat Production Characteristics of Black Bengal Goat, Asian-Australian Journal of Animal Science, 17, 848–856.
Colomer-Rocher, F., Kirton, A.H., Mercer, G.J.K., Duganzich, D.M., 1992. Carcass composition of New Zealand Saanen goats slaughtered at different weights, Small Ruminant Research, 7, 161–173.
Corral de Mesta G., Will P.A. and Gonzalez, J. M., 2004. The Measurement of Carcass Characteristics of Goat using the Ultrasound Method. The Texas Journal of Agriculture and Natural Resource, 17, 46–52.
Delfa, R., Teixeira, A., Cadavez, V., González, C., Sierra, I. (2000): Use of ultrasound measurements for predicting body fat depots in live goats. Proceedings of the 7th International Conference on Goats, Vol. II: 835–836.
Dhanda, J.S., Taylor, D.G., McCosker, J.E. and Murray, P.J., 1999. The influence of goat genotype on the production of Capretto and Chevon carcasses. 1. Growth and carcass characteristics. Meat Science 52, (4), 355–361.
Držaić, V., Mioč, B., Pavić, V., Prpić, Z., Vnučec, I., 2011. The effect of slaughter weight and sex on carcass traits of Croatian Spotted goat kids. XVII World Veterinary Poultry Association Congress, Cancun, Mexico, August, 14–18.
SAS Institute, 2002–2008. Release 8.01 Window version 4.10.2222.SAS Institute Inc., Cary, NC. USA.
Mahgoub, O., Kadim, I.T., Al-Saqry, N.M. and Al-Busaidi R.M., 2004. Effects of body weight and sex on carcass tissue distribution in goats. Meat Science 67, (4), 577–585.
MINITAB. 2006. Meet Minitab 15 for Windows®. Minitab Inc., 3081Enterprise Drive State College, PA, USA.
Nsoso, S.J., and Macheng, M.K., 2009. Ultrasound parameters and body weight in Tswana goat kids during growth and development kept under semi-intensive in Botswana. Botswana Journal of Agriculture and Applied Sciences, 5 (2), 46–55.
Nsoso, S.J., Young M.J. & Beatson, P.R., 1999. The genetic control and manipulation of lean tissue growth and body composition in sheep. Animal Breeding Abstracts, 67(6), 433–443.
Nsoso, S. J., Aganga, A. A., Moganetsi, B. P., and Tshwenyane, S.O., 2003, Body weight, body condition score and heart girth in indigenous Tswana goats during the dry and wet seasons in southeast Botswana. Livestock Research for Rural Development, (15), 4, http://www.lrrd.org/lrrd15/4/nsos154.htm
Oliván, M., Martínez, A., García, P., Noval, G. and Osoro, K., 2001. Estimation of the carcass composition of yearling bulls of “Asturiana de los Valles” breed from the dissection of a rib joint. Meat Science, 57(2), 185–190.
Owen, J.E., Norman, G.A., Philbrooks, C.A. and Jones, N.S.D., 1978. Studies on the meat production characteristics of Botswana goats and sheep—Part III: Carcase composition and distribution. Meat Science, 1 (4), 283–306.
Realini, C.E., Willams, R.E., Pringles, T.D. and Bertrand, J.K., 2001. Gluteus medius and rump fat depths as additional live animal ultrasound measurements for predicting retail product and trimmable fat in beef carcasses. Journal of Animal Science, 79(6), 1378–1385.
Sahin, E.H., Yardimci, M., Cetingul, I.S., Bayram, I. and Sengor, E., 2008. The use of ultrasound to predict the carcass composition of live Akkaraman lambs. Meat Science, 79(4), 716–721.
Sebolai, B., Nsoso, S.J., Podisi, B. and Mokhutshwane, B. S., 2012. The estimation of live weight based on linear traits in indigenous Tswana goats at various ages in Botswana, Tropical Animal Health and production, 44, 899–904.
Silva, S.R., Guedes, C.M., Santos, V.A., Lourenco, A.L., Azevedo, J.M.T. and Dias-da- Silva, A., 2007. Sheep carcass composition estimated form Longissimus thoracis et lumborum muscle volume measured by in vivo real-time ultrasonography, Meat Science, 76 (4), 708–714.
Stanford, K., McAllister, T.A., MacDougall, M. and Bailey, D.R.C., 1995. Use of ultrasound for the prediction of carcass characteristics in Alpine goats, Small Ruminant Research, 15 (2), 195–201.
Teixeira, A., Azevedo, J., Delfa, R., Morand-Fehr, P and Costa, C., 1995. Growth and development of Serrano kids from Montesinho Natural Park (NE of Portugal), Small Ruminant Research, 16, 263–269.
Teixeira, A., Matos, S., Rodrigues, S., Delfa, R. and Cadavez, V., 2006. In vivo estimation of lamb carcass composition by real-time ultrasonography, Meat Science 74 (2), 289–295.
Teixeira, A., Joy, M. and Delfa, R., 2008. In vivo estimation of goat carcass composition and body fat partition by real-time ultrasonography, Journal of Animal Science, 86, 2369–2376.
Wall P.B., Rouse G.H., Wilson D.E., Tait R.G. and Busby W.D., 2004. Use of ultrasound to predict body composition changes in steers at 100 and 65 days before slaughter, Journal of Animal Science, 84, 1621–1629.
Wood, J. D., Enser, M., Fisher, A. V., Nute, G. R., Sheard, P. R., Richardson, R. I., Hughes, S. I. and Whittington, F. M., 2008. Fat deposition, fatty acid composition and meat quality: A review. Meat Science, 78, 343–358.
Yiga-Kibuuka, J., 2010. Present state and future prospects of the small ruminant sub-sector in Botswana. Botswana Journal of Agriculture and Applied Sciences, Special Issue, 6 (3), 82–90.
Acknowledgments
The authors wish to acknowledge the assistance of M. John Phuthego who assisted patiently during data collection. This research was fully funded by the Botswana College of Agriculture.
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Monau, P.I., Nsoso, S.J., Waugh, E.E. et al. Ultrasound measurements of live and carcass traits in Tswana goat kids raised under semi-intensive system in South-eastern Botswana. Trop Anim Health Prod 45, 781–789 (2013). https://doi.org/10.1007/s11250-012-0289-8
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DOI: https://doi.org/10.1007/s11250-012-0289-8