Dairy cows produce more milk for heifers than for baby bulls, according to new research from Kansas State University and Harvard University.
Researchers studied lactation records for more than one million dairy cattle across the country.
Their findings contradicted evolutionary biology theories that predicted bias was in favor of sons. The cows actually produced more milk for their female offspring.
“Daughters seemed to have the most dramatic effect on the initial development of the mammary gland because the bias against sons was greatest in the first lactation,” said K-State Department of Animal Sciences and Industry associate professor Barry Bradford.
The study also found that the sex of the first baby might determine the amount of milk produced for the following children.
The results were available in the scientific journal PLOS One.
Rooster is a full-time farmhand, right-hand man on Shawn Raff’s cattle and dairy operation in Eatonton, Georgia.
December 04, 2025 11:48 AM
·
Buying a real Christmas tree directly supports U.S. farmers facing rising import competition, long production cycles, and weather-driven risks.
December 04, 2025 11:02 AM
·
Milk output is rising, but steep drops in Class I–IV prices are tightening margins heading into 2026.
December 04, 2025 07:00 AM
·
Tight cattle supplies continue to drive lower beef output despite heavier weights.
December 04, 2025 05:00 AM
·
Weaker U.S. dairy prices come as value-added exports expand and ingredient inventories tighten, creating mixed market signals for producers.
December 03, 2025 06:52 PM
·
Buzzard discusses her upcoming appearance on the Dirt Diaries podcast with host Kirbe Schnoor and the importance of sharing authentic stories about agriculture.
December 03, 2025 03:10 PM
·
