Extreme inbreeding at beltsville 1912 1949
This presentation is the property of its rightful owner.
Sponsored Links
1 / 12

Extreme Inbreeding at Beltsville 1912-1949 PowerPoint PPT Presentation


  • 178 Views
  • Uploaded on
  • Presentation posted in: General

Extreme Inbreeding at Beltsville 1912-1949. Experimental Design. 8 consecutive generations of mating sires to their daughters, and dams to their sons Highest inbreeding coefficients ever obtained in cattle (maximum F = 75.1%)

Download Presentation

Extreme Inbreeding at Beltsville 1912-1949

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Extreme inbreeding at beltsville 1912 1949

Extreme Inbreeding at Beltsville 1912-1949


Experimental design

Experimental Design

  • 8 consecutive generations of mating sires to their daughters, and dams to their sons

  • Highest inbreeding coefficients ever obtained in cattle (maximum F = 75.1%)

  • Foundation Guernsey sire (Prince Billy) imported from the Isle of Guernsey in 1910

  • Foundation Holstein sire (Lad 11th) purchased from Minnesota in 1912


Pictures from the study

Pictures From The Study

  • Early matings within the Guernsey and the Holstein lines

  • The 8 Holstein herd sires used. Sire 1 was the sire, maternal grandsire, and maternal great grandsire of sire 2. Further inbreeding led to sire 8 with coefficient F = 62.5%

  • Pedigree of an example cow with F = 64.6%

  • Pedigree of the highest cow with F = 75.1%


Extreme inbreeding at beltsville 1912 1949

Early Matings in the Guernsey Line

USDA Tech. Bulletin No. 339


Extreme inbreeding at beltsville 1912 1949

Early Matings in the Holstein Line

USDA Tech. Bulletin No. 339


Extreme inbreeding at beltsville 1912 1949

Eight Herd Sires Used

USDA Tech. Bulletin No. 927


Sire 1 appears 50 times 64 6 f

Sire 1 Appears 50 Times (64.6% F)


Most inbred cow ever f 75 1

Most inbred cow ever (F = 75.1%)

6

2

1

1

6

3

2

1

A26

6

1

A26

1

A26


Other highly inbred lines

Other Highly Inbred Lines

  • Prospector line of Herefords, max F = 66.3% in 1984 at Colorado State

  • Anxiety 4th line of Herefords, F > 50% in 1980 at North Dakota State

  • Duchess family of Shorthorns, mean F of 40% in 1800’s by Thomas Bates, England

  • Current maximum F in each dairy breed is 40–50% in USA


Conclusions

Conclusions

  • Guernsey line died due to lethal recessive and Brucellosis epidemic

  • Holstein birth weights decreased from 37 kg to 29 kg

  • Milk yield decreased by 7% and fat yield by 17% with inbreeding levels near 50%

  • “Continued inbreeding of whole herds, however, is almost certain to be disastrous.”


References

References

  • Woodward, T.E. and R.R. Graves. 1933. Some results of inbreeding grade Guernsey and grade Holstein-Friesian cattle. USDA Tech. Bulletin No. 339

  • Woodward, T.E. and R.R. Graves. 1946. Results of inbreeding grade Holstein- Friesian cattle. USDA Tech. Bulletin No. 927

  • Swett, W.W., C.A. Matthews, and M.H. Fohrman. 1949. Effects of inbreeding on body size, anatomy, and producing capacity of grade Holstein cows. USDA Tech. Bulletin No. 990


Acknowledgements

Acknowledgements

  • Max Paape rediscovered the original records at the Beltsville research farm.

  • Batchimeg Tseveenjav, Mike Bishop, and Mike MacNeil supplied information on inbred beef lines.

  • Kim Fletcher-Carroll arranged the graphics.


  • Login