Reproduction & Calving
Guides on heat detection, pregnancy & calving, heifer development and fertility economics.
Heat Detection
- A First-Lactation Holstein That Won't Cycle: A Case-Based Diagnostic PathA worked scenario for a first-calf heifer with no observed heat, showing what to rule out before a vet is called in.
- Days to First Service and Days to First Heat: What Feeding System and Lactation Number RevealTwo early-lactation numbers tell you how well cows are restarting, and where to look when they are not.
- Heat Detection in Dairy Cattle: Finding the Right Time to BreedA cow only stays in heat for a short window. Reading the signs, using aids and timing insemination.
- Lameness and Estrus Expression: Why Lame Cows Don't Show Heat (and What to Do About It)A sore foot quietly erases the signs you rely on to find cows in heat.
- Reproductive Hormones and Stress: Why Heat Detection Fails in High-Producing CowsFast liver clearance, stress hormones and cow comfort conspire to shorten and mute heat.
Pregnancy & Calving
- Bull Fertility and AI Technique: The Small Details That Move Conception RateSemen handling, inseminator habits and sire choice are cheap places to find conception points.
- Calving Day: Close-Up Cows, Dystocia and Knowing When to Call the VetA calf is born every few hundred days to every cow in the herd. What normal looks like, when to step in and how to protect the heifer, the calf and the people.
- Estrus Synchronization Protocols for Holsteins: A Practical ComparisonOvsynch, Presynch, Double Ovsynch and heat-based programs compared on timing, workload and fit.
- Heat Stress and Fertility: Protecting the Embryo Before and After BreedingSummer heat damages eggs weeks before breeding and embryos days after it, so the defense has to start early.
- Managing the Repeat Breeder Cow: A Systematic Approach to a Frustrating ProblemBefore blaming the cow, audit the program: most repeat breeders are subfertile, not sterile.
- Transition Management and Longevity: Why the First 60 Days MatterWhat happens around calving echoes through the lactation and often decides how long a Holstein stays in the herd.
- Twinning Rate and 305-Day Production: The Genetic Relationship Every Breeder Should UnderstandTwinning is rare, mostly environmental and only weakly tied to milk yield genetically, but it is costly when it happens.
Heifer Development
Guides in this section are being added.
Fertility Economics
- Conception Rate at First Service: Benchmarking Your Holstein Herd Against Realistic TargetsHow to calculate first-service conception honestly and judge it against targets that fit your herd.
- Pregnancy Rate as the Master Metric: Why It Beats Conception Rate AloneOne number combines how many cows you breed and how many conceive, and it tracks profit better than either alone.
- Voluntary Waiting Period Decisions: Balancing Fertility and Milk PersistencyA longer wait can lift first-service conception, but it is not right for every cow or every herd.
- When Conception Rate Crashed: A Step-by-Step Diagnostic ApproachBefore you blame the semen, work through a structured checklist that separates real fertility problems from bad numbers.