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Scrotal circumference of Australian beef bulls

journal contribution
posted on 14.08.2018, 00:00 by G Fordyce, MR McGowan, A Lisle, T Muller, J Allen, C Duff, RG Holroyd, Nicholas Corbet, BM Burns
Normal range for scrotal circumference in Australian beef bulls was established using more than 300,000 measurements of breed, management group, age, liveweight, and scrotal circumference. The data used were derived from Australian bull breeders and two large research projects in northern Australia. Most bulls were within 250 to 750kg liveweight and 300 to 750days of age. The differences between breeds and variances within breeds were higher when scrotal circumference was predicted from age rather than liveweight, because of variance in growth rates. The average standard deviation for predicted scrotal circumference from liveweight and age was 25 and 30mm, respectively. Scrotal circumference by liveweight relationships have a similar pattern across all breeds, except in Waygu, with a 50 to 70mm range in average scrotal circumference at liveweights between 250 and 750kg. Temperate breed bulls tended to have higher scrotal circumference at the same liveweight than tropically adapted breeds. Five groupings of common beef breeds in Australian were identified, within which there were similar predictions of scrotal circumference from liveweight. It was concluded that liveweight and breed are required to identify whether scrotal circumference is within normal range for Australian beef bulls that experience a wide range of nutritional conditions. © 2014 Elsevier Inc.

History

Volume

81

Issue

6

Start Page

805

End Page

812

Number of Pages

8

ISSN

0093-691X

Publisher

Elsevier Inc.

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

University of Queensland; University of New England; Department of Agriculture Fisheries and Forestry

Era Eligible

Yes

Journal

Theriogenology

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