Factors influencing ultrasonic scanning measures, muscularity scores and body measures in performance‐tested dairy bulls and their usefulness as predictors of beef production ability in Friesian cattle
作者:
Hans Stålhammar,
Thore Henningsson,
Jan Philipsson,
期刊:
Acta Agriculturae Scandinavica, Section A — Animal Science
(Taylor Available online 1997)
卷期:
Volume 47,
issue 4
页码: 230-239
ISSN:0906-4702
年代: 1997
DOI:10.1080/09064709709362391
出版商: Taylor & Francis Group
关键词: animal model;carcass traits;genetic parameters;heritability
数据来源: Taylor
摘要:
Variation in ultrasonic scanning measures, muscularity scores and body measures was studied. Ultrasonic scanning measurements of a cross‐sectional area of m. longissimus dorsi were recorded for 137 Swedish Red and White (SRB) and 246 Swedish Friesian (SLB) performance‐tested bulls. Estimated heritabilities were 0.49 for SRB and 0.36 for SLB. Body measures and muscularity scores were recorded for 638 performance‐tested SLB bulls that were divided into two age groups. Estimated heritabilities for most of the body measures and muscularity scores were between 0.2 and 0.7. Heritabilities were larger for traits expressing height than width or length of the body and larger also for older bulls. The predictive value of body measures and muscularity scores on carcass traits was investigated. Carcass and muscle weight were determined principally by live weight or age at slaughter. The coefficients of determination decreased by 5 to 12% for carcass conformation and 15% for dressing percentage when breed origin, muscularity scores and/or body measures were excluded from the model.
点击下载:
PDF (892KB)
返 回