Effect of Time of Birth Within the Spring Calving Season on Performance and Carcass Traits of Beef C...
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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 PowerPoint PPT Presentation


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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 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 iow

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

  • 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

  • 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

  • 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

  • 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

  • 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 Score1 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)


Effect of time of birth within the spring calving season on performance and carcass traits of beef calves fed in the iow

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


Quality grade by birth sequence within the spring calving season

Quality Grade by Birth Sequence Within the Spring Calving Season


Conclusions

Conclusions

  • 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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