Does Cow Longevity Drive Herd Peformance?
An article by Alastair Rayner in Beef Central considered whether longevity should be regarded as a key driver of herd productivity and concluded it is not a productive trait on its own. Instead, a cow’s value comes from her ability to consistently conceive, calve and wean a healthy calf every year. Drawing on research the article explains that fertility, adaptability and annual reproductive performance are the real drivers of profitability, with longevity simply reflecting these desirable characteristics over time.
The article also explores the balance between retaining productive older cows and accelerating genetic improvement through younger replacements. Although replacing older cows can increase genetic gain by shortening the generation interval, it also introduces greater reproductive risk and replacement costs. Advances in genomic testing are improving the accuracy of selecting younger animals, but in most commercial herds, genetic progress is driven primarily by sire selection.
The conclusion is that producers should focus on keeping cows that remain fertile and profitable rather than culling them based on age alone, as the economic benefits of retaining productive cows often outweigh the gains from faster genetic turnover.
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