A new study, co-authored by a Harvard scientist, offers the first-ever evidence that fetal sex can affect the amount of milk cows produce, a finding that could have major economic implications for U.S. dairy farmers.
The study, which examined 2.4 million lactations by nearly 1.5 million dairy cows in the U.S., found that cows which gestated back-to-back daughters produce as much as 1,000 pounds more milk than those that give birth to sons over the first two lactations. The study is described in a February 3 paper in PLOS ONE.