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Historical examination of culling of dairy cows from herds in the United States

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of culling of dairy cows from herds in the United States H. DUANE NORMAN, E. HARE, and J.R. WRIGHT ... Cow population vs. production Production (quantity, ... – PowerPoint PPT presentation

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Title: Historical examination of culling of dairy cows from herds in the United States


1
Historical examination of culling of dairy cows
from herds in the United States
  • H. DUANE NORMAN, E. HARE, and J.R. WRIGHT
  • Animal Improvement Programs Laboratory
  • Agricultural Research Service, USDA
  • Beltsville, MD 20705-2350
  • dnorman_at_aipl.arsusda.gov ? 301-504-8334

2
Positive vs. negative terms
Longevity Productive life Survival Stayability Her
dlife
Culling Disposals Replacement Turnover
vs.
3
Selection
  • Natural control vs. Human control

Bos primigenius (extinct, 1672)
Bos taurus (Canadian Holstein true type, 1973)
4
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