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May 1, 1950Journal of Dairy ScienceOpen Access

Changes in Milk Production with Age and Milking Frequency

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Authors

JLJay L. LushUniversity of MinnesotaRSR. R. ShrodeNorth Carolina State University

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Overview

Randomized trial explores age correction factors in Holsteins, indicating notable implications for dairy management.

Key Points

  • This research aims to derive age-correction factors for milk production in Holsteins using extensive lactation data. It also discusses the implications of these adjustments on dairy herd management.
  • Analysis of 43,573 lactations from 5,374 cows milked twice daily and 5,627 cows milked thrice daily.
  • Comparison of age correction factors against Kendrick factors and identification of biases due to culling.
  • Recommendations for adjustments based on lactation length and age.
  • Derived multiplicative age-correction factors for Holsteins improve production estimates.
  • Identified biases in existing Kendrick factors, particularly for first and second calving ages.
  • Suggested adjustments improve accuracy with minimal clerical labor compared to existing age corrections.

Cite This Study

Lush et al. (1950) studied this question.

synapsesocial.com/papers/6a1bee55ea84844e355f2f96https://doi.org/10.3168/jds.s0022-0302(50)91909-6
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