A breeding program that allows commercial cattlemen to build a purebred Santa Gertrudis herd without the cost of replacing commercial females is called what?

• A. Inbreeding
• B. Grading up program
• C. Crossbreeding
• D. Linebreeding

Answer: (B)

Grading up is a gradual way to convert a commercial herd into a pure Santa Gertrudis herd without replacing all the cows at once. The idea is to keep your existing females and breed them to a purebred Santa Gertrudis bull. The offspring, especially the females, then carry more and more Santa Gertrudis genetics with each generation, so after a few generations the herd is essentially purebred Santa Gertrudis. This approach minimizes upfront costs while steadily increasing the breed purity.

Other methods don’t fit this goal. Inbreeding concentrates traits by mating relatives, but it’s not about upgrading an entire herd to a specific pure breed. Crossbreeding mixes breeds to gain hybrid vigor, which isn’t aimed at producing a purebred Santa Gertrudis herd. Linebreeding focuses on maintaining a link to a particular ancestor, not converting a commercial herd into one breed.