The value of reproductive tract scoring as a predictor of fertility and production outcomes in beef heifers

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dc.contributor.author Holm, D.E. (Dietmar Erik)
dc.contributor.author Thompson, P.N. (Peter N.)
dc.contributor.author Irons, Pete Charles
dc.date.accessioned 2010-01-21T07:42:41Z
dc.date.available 2010-01-21T07:42:41Z
dc.date.issued 2009-03
dc.description.abstract In this study, 272 beef heifers were studied from just before their first breeding season (October 15, 2003), through their second breeding season, and until just after they had weaned their first calves in March, 2005. This study was performed concurrently with another study testing the economic effects of an estrous synchronization protocol using PG. Reproductive tract scoring (RTS) by rectal palpation was performed on the group of heifers 1 d before the onset of their first breeding season. The effect of RTS on several fertility and production outcomes was tested, and the association of RTS with the outcomes was compared with that of other input variables such as BW, age, BCS, and Kleiber ratio using multiple or univariable linear, logistic, or Cox regression. Area under the curve for receiver operating characteristic analysis was used to compare the ability of different input variables to predict pregnancy outcome. After adjustment for BW and age, RTS was positively associated with pregnancy rate to the 50-d AI season (P < 0.01), calf weaning weight (r = 0.22, P < 0.01), and pregnancy rate to the subsequent breeding season (P < 0.01), and negatively associated with days to calving (r = 0.28, P < 0.01). Reproductive tract scoring was a better predictor of fertility than was Kleiber ratio and similar in its prediction of calf weaning weight. It was concluded from this study that RTS is a predictor of heifer fertility, compares well with other traits used as a predictor of production outcomes, and is likely to be a good predictor of lifetime production of the cow. en
dc.description.uri http://jas.fass.org/cgi/content/full/87/6/1934 en
dc.identifier.citation Holm, DE, Thompson, PN & Irons, PC 2009, 'The value of reproductive tract scoring as a predictor of fertility and production outcomes in beef heifers', Journal of Animal Science, vol. 87, no. 6, pp. 1934-1940. [http://jas.fass.org/] en
dc.identifier.issn 0021-8812
dc.identifier.other 6603165622
dc.identifier.other 7403220452
dc.identifier.other O-6401-2014
dc.identifier.other J-2534-2013
dc.identifier.uri http://hdl.handle.net/2263/12679
dc.language.iso en en
dc.publisher American Society of Animal Science en
dc.relation.requires Adobe Acrobat Reader en
dc.rights American Society of Animal Science en
dc.subject Age at puberty en
dc.subject Beef heifers en
dc.subject Kleiber ratio en
dc.subject Pregnancy rate en
dc.subject Reproductive tract score en
dc.subject Weaning weight en
dc.subject RTS
dc.subject.lcsh Heifers en
dc.subject.lcsh Cattle -- Fertility en
dc.subject.lcsh Cows -- Productivity en
dc.title The value of reproductive tract scoring as a predictor of fertility and production outcomes in beef heifers en
dc.type Article en


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