Male traits and herd reproductive capability in tropical beef cattle. 1. Experimental design and animal measures

Burns, B. M., Corbet, N. J., Corbet, D. H., Crisp, J. M., Venus, B. K., Johnston, D. J., Li, Y., McGowan, M. R. and Holroyd, R. G. (2013) Male traits and herd reproductive capability in tropical beef cattle. 1. Experimental design and animal measures. Animal Production Science, 53 2: 87-100. doi:10.1071/AN12162


Author Burns, B. M.
Corbet, N. J.
Corbet, D. H.
Crisp, J. M.
Venus, B. K.
Johnston, D. J.
Li, Y.
McGowan, M. R.
Holroyd, R. G.
Title Male traits and herd reproductive capability in tropical beef cattle. 1. Experimental design and animal measures
Journal name Animal Production Science   Check publisher's open access policy
ISSN 1836-0939
1836-5787
Publication date 2013-01
Year available 2012
Sub-type Article (original research)
DOI 10.1071/AN12162
Open Access Status
Volume 53
Issue 2
Start page 87
End page 100
Total pages 14
Place of publication Collingwood, VIC, Australia
Publisher C S I R O
Collection year 2013
Language eng
Abstract Research into the genetics of whole herd profitability has been a focus of the Beef Cooperative Research Centre for Beef Genetic Technologies over the past decade and it has been identified that measures of male reproduction may offer a potential indirect means of selecting for improved female reproduction. This paper describes the experimental design and provides a descriptive analysis of an array of male traits in Brahman and Tropical Composite genotypes managed under the medium to high stress, semi-extensive to extensive production systems of northern Australia. A total of 1639 Brahman and 2424 Tropical Composite bulls with known pedigrees, bred and raised in northern Australia, were evaluated for a comprehensive range of productive and reproductive traits. These included blood hormonal traits (luteinising hormone, inhibin and insulin-like growth factor-I); growth and carcass traits (liveweight, body condition score, ultrasound scanned 12–13th rib fat, rump P8 fat, eye muscle area and hip height); adaptation traits (flight time and rectal temperature); and a bull breeding soundness evaluation (leg and hoof conformation, sheath score, length of everted prepuce, penile anatomy, scrotal circumference, semen mass activity, sperm motility and sperm morphology). Large phenotypic variation was evident for most traits, with complete overlap between genotypes, indicating that there is likely to be a significant opportunity to improve bull fertility traits through management and bull selection.
Keyword Northern Australia
Phenotypic relationships
Testosterone response
Productive traits
Heifer pregnancy
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published: 4 December 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
Official 2013 Collection
School of Veterinary Science Publications
 
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