Percorrer por autor "Blasco, I."
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- Ultrasonic estimates of fat thickness and longissimus dorsi muscle depth for predicting carcass composition of live Aragon lambsPublication . Delfa, Rafael; Teixeira, Alfredo; González, C.; Blasco, I.Six ultrasonic fat and muscle depth measurements, taken on the left and the right side of the fourth lumbar vertebra and third stemebra of the breast bone, were related to carcass composition to determine the accuracy of these measurements for predicting carcass compositon of live Aragdn lambs (Temasco) . Live weight alone accounted for 21, 19,26, 18 and 47% of total variation of muscle, bone plus remainder, total fat, and subcutaneous and intermuscular fat, respectively. Addition of ultrasonic fat depth measurement on the right side of the lumbar region accounted for a further 18,31,33 and 36% of muscle, bone plus remainder, total carcass fat and subcutaneous fat, respectively. Addition of the same measurement taken on the left side accounted for a further 15% of intermuscular fat. Live weight alone accounted for only 4% of the total variation of kidney and pelvic fat, but the addition of ultrasonic fat depth measurement on breast bone accounted for a further 26% of the variation of this fat depot. The accuracy of prediction of carcass composition on live animals could be improved by the addition of ultrasonic fat measurements.
- Ultrasonic estimates of fat thickness, C measurement and longissimus dorsi depth in rasa aragonesa ewes with same body condition scorePublication . Delfa, Rafael; Teixeira, Alfredo; Blasco, I.; Colomer-Rocher, F.Ultrasonic estimates of fat thickness, C measurement and longissimus dorsi depth were assessed in 14 Rasa Aragonesa ewes with same body condition score. The ultrasonic estimates have been used for predicting tota1 carcass fat and muscle. The 76% of the variation in carcass lumbar fat thickness was accounted for by variation in lumbar fat thickness assessed by ultrasonic machine, whereas 53% of the variation in C measurement was accounted. Nevertheless only 5% of variation in m. Longissimus dorsi depth was accounted for by variation in this measurement assessed by ultrasonics. The inclusion of cold carcass weight as an independent variable in a multiple regression with lumbar fat thickness assessed by ultrasonics and the same measurement obtained on carcass improve the precision of total carcass fat and muscle predictions (r=81 and 91%).