Repeatability of ultrasound image measurements of carcass traits in Nellore cattle

被引:5
作者
Zerlotti Mercadante, Maria Eugenia [1 ]
Da Luz e Silva, Saulo [2 ]
Bueno, Mauro Sartori [1 ]
Tarouco, Jaime Urdapilleta [3 ]
Iti Yokoo, Marcos Jun [4 ]
机构
[1] SAA, APTA, Inst Zootecnia, Sertaozinho, SP, Brazil
[2] Univ Sao Paulo, Fac Zootecnia & Engn Alimentos, Pirassununga, SP, Brazil
[3] Univ Fed Rio Grande do Sul, Fac Agron, Porto Alegre, RS, Brazil
[4] UNESP, Fac Ciencias Agr & Vet, Jaboticabal, SP, Brazil
来源
REVISTA BRASILEIRA DE ZOOTECNIA-BRAZILIAN JOURNAL OF ANIMAL SCIENCE | 2010年 / 39卷 / 04期
关键词
backfat thickness; beef cattle; image quality; longissimus dorsi muscle area; ultrasound; FAT THICKNESS; ACCURACY; AREA;
D O I
10.1590/S1516-35982010000400008
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
The repeatability of ultrasound image measurements of the longissimus dorsi muscle (AOL) and of the rumpfat (EGG) and backfat (EGL) subcutaneous thickness was evaluated. Ultrasound images taken from the back (between 12(th) and 13(th) ribs) and from the rump (between gluteus medium and biceps femoris muscles) of Nelore heifers at 14 and 22 months of age were classified as acceptable, marginal and rejected. The acceptable and marginal images were measured twice by three technicians at different levels of training. It was estimated repeatabilities among and within technicians by class of image quality in order to determine effect of image quality and of the technician at the absolute difference value between the first and second measurement of those traits. The repeatability for acceptable images was higher than for marginal images, for both among and within technicians. Regarding to the absolute difference analyses between the first and second interpretation, the effects of the technician for AOL and EGL and quality class of image for AOL were significant. In general, the repeatability was higher for the most experienced technician. It is advisable that measurements of images in the same contemporaneous group should be done by one single technician.
引用
收藏
页码:752 / 757
页数:6
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