Breed & Genetics
Guides on holstein profile, genetics & selection, breeding systems and genetic improvement.
Holstein Profile
Genetics & Selection
- Bull Selection for the Modern Holstein: Balancing Production, Fertility, and Health TraitsA sound sire team starts with a total-merit index and uses everything else to avoid blind spots.
- Genomic Predictions for Heat Tolerance in U.S. Holsteins: What the New Research Means for Your Breeding ProgramLarge U.S. data sets now show that heat tolerance is partly genetic, but turning that into bull picks takes care.
- Genomic Testing and Net Merit: Choosing Holstein Heifers and Sires by the NumbersDNA testing changed dairy breeding. What a genomic test tells you, what Net Merit measures and how to use the numbers without ignoring the cow in front of you.
- Record Keeping for Genomic Evaluations: Why Parentage and Performance Data MatterA genomic test is only as good as the identification, pedigree and performance records that sit behind it.
- Selecting for Heat Tolerance Without Sacrificing Milk Yield or Fertility: A Practical GuideA balanced-selection approach for breeders who want cows that cope with summer but still pay the bills.
Breeding Systems
- AI, Sexed Semen and Beef-on-Dairy: Choosing a Breeding System for HolsteinsWho gets Holstein semen, who gets sexed semen and who gets a beef sire. How dairies use all three tools to build a herd and a calf check.
- Beef-on-Dairy Crosses: What You Need to Know About Calving Ease and Calf ValueBeef semen on Holstein cows looks safe at calving, but calf value depends on which sire you choose and why.
- Crossbreeding Holsteins: What Heterosis Effects Actually Deliver in Pasture-Based SystemsCrossbred cows often win on fertility, but the best U.S. trial data come from confinement herds, so grazing results need a careful read.
Genetic Improvement
- Benchmarking Health Traits Genetically: What Slovak Holstein Data Reveal About Selection OpportunitiesA first look at the genetics of mastitis, claw disease, metritis and ketosis in Slovak Holsteins shows both the promise and the limits of selecting for health.
- Genomic Testing Heifers: When It Pays and When It Doesn't for Commercial Holstein OperationsTesting every heifer is not automatically profitable; the payoff depends on what you already know and what you will do with the answer.
- Haplotype Analysis and Recessive Traits: What Holstein Breeders Need to Screen ForFertility haplotypes and a short list of recessive diseases can quietly cost you pregnancies, and matings are where you control them.
- Heat Tolerance as a Breeding Goal: Preparing for a Warmer Climate Without Losing ProductionHeat tolerance is heritable, but the research shows it pulls against yield, so selection needs a plan.
- Mid-Infrared Methane Prediction and Production Traits: What It Means for ManagementMilk spectra already collected at test day can estimate methane, and the genetics look more compatible with productivity than many people feared.
- The Future of the Holstein: Will Heat-Tolerant Genetics Reshape the Breed?The breed has changed before, and a warming climate is now one of the pressures on its next chapter.