English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

. The present studyisacomponentof amulti-site experiment,usingBostauruscattle generated atfourlocations acrosssouthernAustralia,designedtoexaminepostweaninggrowthpathwaysforprogenywhosesireswereextremeinretail beefyieldandintramuscularfat.Treatmentandinteractioneffectsonbeefproductionandmeatqualitywereexaminedwithin andacrosssites.Thepresentpaperdescribestheeffectofpostweaninggrowthandsirecarcasstypeonliveweightandcarcass traits at the Hamilton site. Angus sires selected on estimated breeding values for extremes in retail beef yield (RBY%), intramuscular,fat (IMF%) (estimated breeding values for IMF% are derived by using live-animal ultrasound scanning) or bothandsirebreedtypesconsideredtobemoreextremeinthosetraits(Limousin,andBelgianBlueforyield,andWagyufor intramuscularfat)werejoinedtocrossbredandstraight-bredcows.Afterweaning,theresultant645steerandheiferprogeny were grown on a fast and slow growth path to ~550 kg and slaughtered, averaging 0.68 kg/day and 22.2 months, and 0.49kg/dayand27.8monthsforgrowthrateandageatslaughter,respectively.Growthpath,sirecarcasstypeandsexaffected carcass traits; however, there were no sire carcass type by growth treatment interactions. The fast growth-path cattle were fatter,hadmoreintramuscularfat(measuredchemically),ahigherMeatStandardsofAustralia(MSA)USAandAUSmarble score, and a higher predicted MSA eating-quality score. Progeny of Wagyu sires were lighter at weaning and slaughter and had a lower hot standard carcass weight than the other sire carcass types. The Belgian Blue and Limousin progeny,had a higherdressingpercentage,ahigherRBY%andalowerP8andrib-fatdepthandlowerIMF%thantheothersirebreedtypes. Progeny of the high RBY% Angus had a lower rib-fat depth, a lower IMF% and higher RBY% than those selected for high IMF%. There was no difference in IMF% between the Wagyu or the high IMF% Angus. Progeny from the Belgian Blue, LimousinandWagyuhadalargereyemuscleareathantheothersirebreeds.Theresultsindicatethatsimultaneousselection for supposedly,antagonistic traits of IMF% and RBY% would,result in carcass having high values of both measurements. Femaleswerelighterthansteersatslaughter,hadalowerhotstandardcarcassweight,werefatterattheP8andrib,andhada highermarblescoreandIMF%,aloweryieldandalowerMSA-predictedeating-qualityscorethandidsteers.Therewasno interaction between,postweaning,growth,and sire carcass type. These results indicate that with the use of appropriate sire carcass types and BREEDPLAN, and post-weaning nutrition, beef producers can confidently change carcass parameters to suit market,specifications. Additional keywords: sire breed type.

Effect of postweaning growth and bulls selected for extremes in retail beef yield and intramuscular fat on progeny liveweight and carcass traits