Study of interpreter, machine and operator effects on accuracy of ultrasonic estimates of carcass traits in live pigs
1997
Duran, P.G. | Harada, H. | Kuwahara, M. | Saton, K. | Fukuhara, R. (Central Luzon State Univ., Munoz, Nueva Ecija (Philippines). Philippine Carabao Center)
Two sets of experiments were conducted to evaluate the effects of some factors on accuracy of ultrasonic estimates of carcass traits in pigs. Experiment 1 was designed for enterpreter and machine effects that utilized 67 hd of Landrace pigs at 90 kg body weight while experiment 2 was done for operator effects with 28 hd of pigs of the same breed scanned at 40, 60 and 90 kg body weights. Scanning positions A and B were taken between the 5th and 6th ribs and C and D between the 12th and 13th ribs. Ultrasonic carcass traits were estimated on the rib eye area (REA) at positions A and C; fat thickness (FT) at positions A, B, and C; rib thickness (RT) at positions B and D; and total thickness (TT) at position D. A combination of position and trait was considered as one trait. For example, REA and FT on position A were considered as A-REA and A-FT, respectively. Scanning machine used was a real-time ultrasound (RTU) for the interpreter and operator effects while RTU and mechanical scanning scope (MSS) were used to evaluate the effects of machine. Mean differences between two interpreters, between machines (RTU and MSS) with actual C-REA and between two operators with ultrasonic estimates of carcass traits were relatively small (0.7 to 1.4) with high correlation coefficient (0.88 to 0.98). From these results, ultrasound is a valid means of estimating carcass traits in live pigs
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