2023_negative_energy_balance_fresh cows

Fresh Cows and Negative Energy Balance

  • Definition and Context

    • Fresh cows: Cows in the first 40 days post-calving.

    • Negative energy balance (NEB): Condition when energy intake does not meet energy output, common in fresh cows due to high energy demands for lactation.

    • Timeframe: Typically occurs from calving until about 21 days into lactation as cows transition to high milk production.

Factors Affecting Fresh Cows

  • Dry Matter Intake (DMI)

    • Sharp decrease in DMI observed around calving.

    • DMI usually lags behind milk yield increase after calving.

  • Milk Yield (MY)

    • Increases immediately after calving.

    • Peaks around Days in Milk (DIM) 51 to 100.

    • Typical Holstein MY ranges are observed:

      • Peak milk: 133 lbs (60 kg) during 3rd week of lactation.

  • Body Weight and Body Condition Score (BCS)

    • BCS is crucial for assessing cow health postpartum.

    • Suggested BCS goals:

      • Calving: 3 to 3.25

      • Early lactation: 3 to 3.25

      • Peak: 2.5 to 2.75

      • Mid to late lactation: incrementally increases up to 3.25.

Metabolic Disorders in Fresh Cows

  • Common Disorders

    • Ketosis: High levels of non-esterified fatty acids (NEFA) and low blood glucose.

      • Typically occurs in the first 30 to 60 days post-calving.

      • Prevalence: 7%–14% in first 60 days.

      • Treatments: IV glucose, propylene glycol drench.

    • Fatty Liver Disease (Fatty Cow Syndrome): Correlated with high blood FFA levels leading to triglyceride build-up in liver, impairing glucose production.

    • Displaced Abomasum (DA): Most common in first month post-calving, with prevention strategies focusing on maintaining DMI and hydration.

Nutritional Management of Fresh Cows

  • Key Nutritional Goals

    • Encourage high intake of non-fiber carbohydrates (NFC) and CP to meet high energy demands.

    • Monitor DMI, MY, and adjust feeding strategies to support energy balance.

    • Expectations during transition period:

      • High NFC (%DM)

      • High NDF (%DM)

      • High crude protein (CP) (%DM)

      • High energy (Mcal/lb DM).

Challenges and Prevention Strategies

  • Many metabolic issues may stem from conditions established during the dry period; therefore, effective management during this time is crucial.

  • Continuous monitoring and planning fluctuate energy intake against energy output to avoid prolonged NEB, reducing missing opportunities for maximum production capacity.