Isa Beefmasters
55 animals · Beefmaster · San Angelo, Texas
Beefmasters' Largest One-Brand Bull Sale
Six generations of Lasaters, a herd closed since 1937. 65th Bull Sale, October 3, 2026: 109 bulls averaged $9,378. Next sale: October 2, 2027, San Angelo, Texas.
Why Isa Beefmasters
Founding-Family Genetics
Tom Lasater founded the Beefmaster breed and closed his herd in 1937. The L Bar herd has been selected for the Six Essentials ever since.
Yearlong Performance Test
Every sale bull goes through separate gain tests on grass and feed, with carcass sonograms, DNA-verified parentage and genomic-enhanced EPDs.
Bulls That Hold Up
Raised rough on leased West Texas grass with minimal supplement. Trich and fertility tested, fully guaranteed, with free delivery on volume purchases.
Top Sellers, 65th Bull Sale
October 3, 2026, San Angelo: the high sellers of a $9,378-average sale
The En Fuego Legacy
En Fuego and the sons and daughters carrying his line
Donor Females & Embryos
Frozen embryos from top L Bar dams, export-eligible
Our Story
Beefmaster cattle are the first American composite breed. Tom Lasater began developing the breed in 1931 in South Texas, crossing Brahman, Hereford and Shorthorn cattle, and in 1937 he closed his herd to outside genetics. The USDA recognized Beefmasters in 1954.
Today Lorenzo Lasater and his sister and partner, Isabel Lasater Hernandez, represent the fifth generation of the family dedicated to breeding performance Beefmaster genetics. The L Bar brand, first used by Ed Lasater in 1892, has been used continuously by six generations of the family in Texas and Mexico.
We run on 12 leased ranches across seven Texas counties, in a harsh semi-desert environment, with a strict 60-day breeding season. Every herd bull comes from the Isa Bull Performance Test, and every year we host the largest one-brand bull sale in the Beefmaster breed.
Sale Calendar & Milestones
The L Bar brand
Ed C. Lasater first uses the L Bar brand in South Texas.
Herd closed
Tom Lasater closes his herd to outside genetics: the birth of Beefmasters.
USDA recognition
Beefmasters recognized as the first American composite breed.
65th Beefmaster Bull Sale
Producers Auction, San Angelo. 109 bulls to 43 buyers from six states and Mexico; average $9,378, high seller L Bar 4507 at $19,000.
90 years of Beefmasters
90th anniversary of Tom Lasater closing his herd.
66th Beefmaster Bull Sale
About 110 performance-tested L Bar bulls, first Saturday in October, San Angelo, Texas.
What Our Customers Say
"The bulls come off grass ready to work and they hold up in tough country. The performance data makes picking a set easy."
"We couldn't make the sale, so they picked out bulls to our specs and delivered them. Every one fit what we asked for."
"Our L Bar-sired heifers calve early and stay in the herd. That's the Six Essentials paying off."