ST genetics

Females calving heifers in their first two pregnancies produce up to 981 lbs. more milk over the two lactations than females calving back-to-back males.

(Hinde K, et al, (2014), Holsteins Favor Heifers, Not Bulls: Biased Milk Production Programmed during Pregnancy as a Function of Fetal Sex. PLoS ONE 9(2): e86169. doi:10.1371/journal.pone.0086169)

See the article here:
ST genetics

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