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Title: Pelvic Measurements of Heifers: A Case Study in Hawaii 
Author: Fukumoto, Glen K; Bredhoff, Carl H; Richards, H M
Date: 1995-06
Publisher: University of Hawaii
Citation: Fukumoto GK, Bredhoff CH, Richards HM. 1995. Pelvic measurement of heifers: a case study in Hawaii. Honolulu (HI): University of Hawaii. 8 p. (Research Extension Series; RES-160).
Abstract: Pelvic measurement (PM) can be used as a management tool in reducing the incidence and
severity of calving difficulty (dystocia) in beef cattle operations. A large majority of calving difficulties occurs in first-parity heifers. By identifying and quantifying heifers' pelvic areas, ranchers can make informed culling decisions affecting the future productivity and economic success of the cow herd. We evaluated the impact of PM-based heifer culling decisions on the
percent of calving losses at parturition. In total, 2244 long yearling heifers were measured using a Rice pelvimeter. Pelvic areas ranged from 133 to 255 cm2; heifers with pelvic area less than 187.5 cm2 were culled. Calving losses in the herd prior to PM were 7.18 ± 1.06, whereas losses after PM were 4.08 ± 0.28. Calving losses were significantly lower (P<0.05) when critical
minimum pelvic area measurements were used as culling criteria, compared to the visual culling criteria used prior to PM. In summary, the use of PM can significantly reduce the incidence of dystocia in a commercial heifer herd when combined with a sound herd health and nutrition program for heifers and the use of "calving-ease" (low birth weight) bulls.
Series/Report No.: Research Extension Series
160
Pages/Duration: 8 pages
ISSN: 0271-9916
URI: http://hdl.handle.net/10125/5486
Keywords: body measurements, calving, dystocia, ease of birth, Hawaii, heifers, pelvis

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