The aim of this study was to determine the suitability of ultrasound and zoometric measurements and visual muscle scoring for predicting the carcass value of 167 young Holstein-Friesian (HF) bulls. Zoometric and ultrasound measurements were performed and live muscle scoring was estimated before slaughter. After slaughter, hot carcass weight (HCW) was determined and carcasses were assigned to conformation and fat classes according to the EUROP system. Multiple regression equations were derived to estimate the weight, conformation and fatness of carcasses. HCW was estimated using the following equations: Ŷ = 1.507x1 + 1.103x2 + 4.043x3 + 5.53x4 + 0.379x5 + + 8.076x6 - 678.93 (R2=0.892; Sy = 16.28) and Ŷ = 2.525x4 + 0.579x7 + 0.451x8 - 134.17 (R2=0.943; Sy = 11.84); independent variables x1 - height at sacrum (cm); x2 - chest girth (cm); x3 - pelvic width (cm); x4 - pelvic length (cm); x5 - thickness of M. gluteo-biceps (mm); x6 - intravital muscle scoring (points); x7 - thickness of M. longissimus dorsi (mm); x8 - live weight (kg). Validation of the first regression equation revealed overestimation of HCW by 1.25% on average, while validation of the second equation revealed its underestimation by 1.85% on average. It was found that intravital muscle scoring and selected ultrasound and zoometric measurements of HF bulls can be used in formulating regression equations for predicting the carcass value of live animals. The proposed models enable predicting the carcass value of young bulls with satisfactory accuracy, thus contributing to an objective live beef cattle assessment
If the inline PDF is not rendering correctly, you can download the PDF file here.
Baker M.J., Tedeschi L.O., Fox D.G., Henning W.R., Ketchen D.J. (2006). Using ultrasound measurements to predict body composition of yearling bulls. J. Anim. Sci., 84: 2666-2672.
Bergen R., Crews Jr. D.H., Miller S.P., Mc Kinnon J.J. (2003). Predicting lean meat yield in beef cattle using ultrasonic muscle depth and width measurements. Can. J. Anim. Sci., 83: 429-434.
Bergen R., Miller S.P., Mandell I.B., Robertson W.M. (2005). Use of live ultrasound, weight and linear measurements to predict carcass composition of young beef bulls. Can. J. Anim. Sci., 85: 23-35.
Blanco Roa N.E., Huba J., Polák P., Hetényi L., Peškovičová D., Bahelka I. (2003). Comparison of differences in muscle depth and possibilities to predict some parameters of carcass value in bulls by an ultrasonographic method. Czech J. Anim. Sci., 48: 338-343.
Brethour J.R. (2000). Using serial ultrasound measures to general model of marbling and backfat thickness changes in feedlot cattle. J. Anim. Sci., 78: 2055-2061.
Charagau P.K., Crews Jr. D.H., Kemp R.A., Mwansa P.B. (2000). Machine effect on accuracy of ultrasonic prediction of backfat and ribeye area in beef bulls, steers and heifers. Can. J. Anim. Sci., 80: 19-24.
Choroszy Z., Grodzki G., Choroszy B., Szewczyk A., Stachyra M. (2010). Evaluation of beef cattle conformation in Poland - method description (in Polish). Prz. Hod., 8: 1-4.
Cochran W.G., Cox G.M. (1957). Experimental Design (2nd Ed.). John Wiley & Sons, New York.
Conroy S.B., Drennan M.J., Kenny D.A., Mc Gee M. (2009). The relationship of live animal muscular and skeletal scores, ultrasound measurements and carcass classification scores with carcass composition and value in steers. Animal, 3: 1613-1624.
Conroy S.B., Drennan M.J., Kenny D.A., Mc Gee M. (2010). The relationship of various muscular and skeletal scores and ultrasound measurements in the live animal, carcass classification scores with carcass composition and value of bulls. Livest. Sci., 127: 11-21.
Drennan M.J., Keane M.G., Mc Gee M. (2007). Relationship of live animal scores/measurements and carcass grades with carcass composition and carcass value of steers. In: Evaluation of carcass and meat quality in cattle and sheep, Lazzaroni C., Gigli S., Gabina D. (eds). Wageningen Academic Publishers, EAAPpublication, 123, pp. 159-169.
Drennan M.J., Mc Gee M., Keane M.G. (2008). The value of muscular and skeletal scores in the live animal and carcass classification scores as indicators of carcass composition in cattle. Animal, 2: 752-760.
Gil Z., Adamczyk K., Golonka M., Zapletal P., Choroszy Z. (2007). Prediction of dressing percentage in young cattle based on pre-slaughter evaluation of selected traits (in Polish). Rocz. Nauk. Zoot., 34: 13-19.
Greiner S.P., Rouse G.H., Wilson D.E., Cundiff L.V., Wheeler T.L. (2003 a). The relationship between ultrasound measurements and carcass fat thickness and longissimus muscle area in beef cattle. J. Anim. Sci., 81: 676-682.
Greiner S.P., Rouse G.H., Wilson D.E., Cundiff L.V., Wheeler T.L. (2003 b). Prediction of retail product weight and percentage using ultrasound and carcass measurements in beef cattle. J. Anim. Sci., 81: 1736-1742.
Indurain G., Carr T.R., Goni M.V., Insausti K., Beriain M.J. (2009). The relationship of carcass measurements to carcass composition and intramuscular fat in Spanish beef. Meat Sci., 82: 155-161.
Mc Kiernan B. (2007). Muscle scoring beef cattle. NSW Department of Primary Industries, New South Wales, Australia, http:www.dpi.nsw.gov.au/__data/assets/pdf_file/0006/103938/musclescoring-beef-cattle.pdf
Młynek K., Litwińczuk Z. (1999). Suitability of zoometric measurements and conformation indices for evaluating slaughter value of cattle slaughtered at around 5000 kg body weight (in Polish). Zesz. Nauk. Prz. Hod., 44: 343-351.Realini C.E., Williams R.E., Prongle T.D., 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. J. Anim. Sci., 79: 1378-1385.
Słoniewski K., Dymnicki E., Sakowski T., Oprządek J., Oprządek A. (2001). Use of in vivo ultrasound measurements for predicting the slaughter value of beef bulls. Anim. Sci. Pap. Rep., 19: 57-64.
Tait R.G. Jr., Wilson D.E., Rouse G.H. (2005). Prediction of retail product and trimmable fat yields from the four primal cuts in beef cattle using ultrasound or carcass data. J. Anim. Sci., 83: 1353-1360.
Török M., Polgár J.P., Kosci G., Farkas V., Szabó F. (2009). Correlation of ultrasonic measured ribeye area and fat thickness to the certain traits measured on slaughter bulls (Short Communication). Arch. Tierz., 52: 23-27.
Trela J., Choroszy B. (2011). The work of the National Research Institute of Animal Production in beef livestock production (in Polish). Wiad. Zoot., XLIX, 4: 11-56.