Weaned Calf $Value ($W) quantifies four primary economic impact areas:
Birth Weight - birth weight influences on calf death losses related to dystocia, weaned calf crop percentage, and resulting revenue per cow.
Weaning Weight - direct growth impact on weaning weight revenue (pre-weaning growth and pounds of calf sold) and energy requirements and related costs to necessary to support pre-weaning calf growth.
Maternal Milk - revenue from calf pre-weaning growth and pounds of calf sold as influenced by varying cow milk levels, and costs related to lactation energy requirements.
Mature Cow Size - expense adjustments are made for maintenance energy as related to differing mature cow size, including mathematical linkages between mature weight and yearling weight.
The impact areas are combined into a bio-economic value expressed in dollars per
head assigned to Angus genetics from birth through weaning. Resources used to
form the Wean Calf Value ($W) include National Research Council (NRC), US Meat
and Animal Research Center (USMARC), Cattle-Fax, SPA and university cow-calf
budgets, and the American Angus Association performance database.
$Values only have meaning when used in comparing the relative merit or ranking
of two individuals. $W provides the expected dollar-per-head difference in
future progeny preweaning performance in a multi-trait fashion, within a typical
U.S. beef cowherd. If Bull A has a $W of +50.00 and Bull B has a $W of +35.00,
and these sires were randomly mated to a comparable set of females and the
calves were exposed to the same environment, and a normal number of replacement
females were saved from both sires, on average you could expect Bull A's progeny
to have a +15.00 per head advantage in pre-weaning value over Bull B's progeny
(50.00 - 35.00 = +15.00 per head). As with any $Value, $W only has meaning when
used in comparing the relative merit or ranking of two individuals.
As with other $Values, the Weaned Calf Value includes assumptions, as listed below:
|Base Calf Price ||$185 per cwt
|Cow/Heifer Mix ||80%/20%
|Cow Weight ||1300 lb
|Feed energy cost ||$.090 per MCal NEm