At a stud farm in Ciney, Belgium, a bull mounts a “teaser” bull while a worker puts a sleeve on his penis to collect semen for artificial insemination. Belgian Blue cattle have been selectively bred to carry a gene that suppresses a protein that limits muscle growth, giving rise to massive “double-muscled” animals prized for producing more beef—and more-tender beef—on less feed than the average bovine. The downside is a condition called dystocia, or difficult birth, due to a combination of greater birth weight of the calf and reduced pelvic opening, causing an estimated 90 percent or more of Belgian Blues to require caesarean delivery.
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![At a stud farm in Ciney, Belgium, a bull mounts a “teaser” bull while a worker puts a sleeve on his penis to collect semen for artificial insemination. Belgian Blue cattle have been selectively bred to carry a gene that suppresses a protein that limits muscle growth, giving rise to massive “double-muscled” animals prized for producing more beef—and more-tender beef—on less feed than the average bovine. The downside is a condition called dystocia, or difficult birth, due to a combination of greater birth weight of the calf and reduced pelvic opening, causing an estimated 90 percent or more of Belgian Blues to require caesarean delivery.](https://www.georgesteinmetz.com/img-get2/I0000dCqGfixG7mI/fit=1000x750/STNMTZ-20230922-27643.jpg)
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