by Tom Brink, RAAA CEO
Definition: Stayability predicts differences in the ability of an animal’s retained daughters to remain productive in the herd, calving every year, through six years of age. Units are in percentage terms; higher is better.
STAY is an IGS-calculated EPD, with millions of cow records behind it. RAAA’s total herd reporting policy, which has been in place for more than 25 years, also adds considerable data quality and quantity to the estimation of our STAY EPD.
The main difficulty with STAY is that it is a lowly-heritable trait (10-15 percent genetically influenced). Thus, 85-90 percent of observed outcomes in the pasture are the result of environmental influences, not genetics. This situation makes STAY a difficult trait to see in an individual herd. Most of what producers notice in terms of cows staying in, or falling out of over time, is caused by non-genetic/environmental factors.
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