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Effect of Time of Birth Within the Spring Calving Season on Performance and Carcass Traits of Beef Calves Fed in the Iowa Tri-County Steer Carcass Futurity. G.D. Fike 1 , M.E. King 1 , L.R. Corah 1 and W.D. Busby 2 1 Certified Angus Beef LLC 2 Iowa Tri-County Steer Carcass Futurity

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Effect of Time of Birth Within the Spring Calving Season on Performance and Carcass Traits of Beef Calves Fed in the IowaTri-County Steer Carcass Futurity

G.D. Fike1, M.E. King1, L.R. Corah1 and W.D. Busby2

1Certified Angus Beef LLC

2Iowa Tri-County Steer Carcass Futurity

2010 Annual ASAS Meeting


Introduction and background
Introduction and Background Performance and Carcass Traits of Beef Calves Fed in the Iowa

  • Larson, et al., (2010) found that calves born during the first 21 d calving period had greater HCW, marbling scores and greater % grading premium Choice and higher carcass values than calves born in the 2nd or 3rd 21 d intervals; however, no differences were found in ADG


Objectives
Objectives Performance and Carcass Traits of Beef Calves Fed in the Iowa

  • Does age of calf and time of birth within the calving season affect:

    • Feedlot performance

    • Marbling score and, ultimately, USDA quality grade

    • Certified Angus Beef ® (CAB®) acceptance rate


Materials and methods
Materials and Methods Performance and Carcass Traits of Beef Calves Fed in the Iowa

  • Data were analyzed on 1,369 calves from a single, central Missouri ranch for a six-year period (2002-2007)

  • Genetics were Angus/Simmental-based, rotating sires among different years

  • All cattle were fed a common dietary energy level and administered similar health and implant treatments in a southwest Iowa feedlot

  • All cattle were weighed, sorted, vaccinated, implanted, disposition scored and body conditioned scored within 4 days of arrival


Materials and methods1
Materials and Methods Performance and Carcass Traits of Beef Calves Fed in the Iowa

  • Calves were sorted and harvested when visually determined to have one cm of fat cover

  • Only cattle with full, detailed carcass and performance information were included in the study

  • Calves were divided into four sequence groups:

    • Early – born d 1-21 of calving season (E)

    • Mid-early – born d 22-42 (ME)

    • Mid-late – born d 43-63 (ML) and

    • Late – born d>63 (L)


Materials and methods2
Materials and Methods Performance and Carcass Traits of Beef Calves Fed in the Iowa

  • Statistical analyses:

    • Continuous outcomes were quantified using one-way analysis of variance (ANOVA)

    • For rate analyses, Chi-square was employed


Percent angus of the calf by birth sequence within the spring calving season
Percent Angus of the Calf by Birth Sequence Within the Spring Calving Season

a

abcMeans with unlike superscripts differ (P<0.05)


Disposition score 1 of the calf by birth sequence within the spring calving season
Disposition Score Spring Calving Season1 of the Calf by Birth Sequence Within the Spring Calving Season

a

1Disposition score: 1=docile; 6=very aggressive

abMeans with unlike superscripts differ (P<0.05)


Feedlot Delivery Weight, Adjusted Final Weight, Harvest Age and HCW by Birth Sequence Within the Spring Calving Season

abcdMeans within a row with unlike superscripts differ (P<0.05)


Carcass merit by birth sequence within the spring calving season
Carcass Merit by Birth Sequence Within the Spring Calving Season

a bMeans within a row with unlike superscripts differ (P<0.05)

1Marbling score: 400=Small0; 500=Modest0



Conclusions
Conclusions Season

  • The oldest calves were/had:

    • Heavier at feedlot delivery

    • Heavier at harvest and greater HCW

    • Greater marbling scores

    • Higher percentage of calves grading USDA Choice and CAB®

    • Greater carcass value per head

      • Than their latest born counterparts


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