Diamond D Angus raises registered black Angus cattle in Valier, Montana, situated in the heart of the state's Golden Triangle grain and range country, roughly an hour southeast of Great Falls.
Mark DeBoo is the third generation of his family to breed functional Angus on this ground, with the program's roots stretching back to the 1950s when his grandparents, Charlie and Mary, were among the only registered Angus breeders in the region. Mark returned to the ranch in 1988 and launched the first production sale the following year, growing the operation from modest beginnings into a program whose genetics now reach producers across the United States, Canada, and Argentina.
The breeding philosophy at Diamond D Angus centers on moderate-framed, forage-efficient cattle built to last. Selection emphasizes calving ease, sound feet, good udders, and quiet dispositions, with culling standards applied strictly — no foot trimming to mask structural problems, no tolerance for poor udder quality or poor attitude. Cows in the herd routinely remain productive into their mid-teens, and weaning weights consistently run at or above fifty percent of the dam's body weight. For ranchers searching for black Angus cattle in Montana bred for longevity and maternal efficiency, Diamond D Angus offers a multigenerational program with a clear, consistent standard.
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