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Related Experiment Videos

Efficiency of feed utilization in Holsteins selected for yield.

J E Legates1

  • 1Department of Animal Science, North Carolina State University, Raleigh 27695-7621.

Journal of Dairy Science
|June 1, 1990
PubMed
Summary

Selection for higher milk yield in Holstein cows increased their feed efficiency, primarily through greater corn silage intake. This demonstrates that breeding for increased yield can positively impact feed utilization in dairy cattle.

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Area of Science:

  • Animal Science
  • Dairy Cattle Nutrition
  • Genetics and Breeding

Background:

  • Holstein cows are bred for increased milk production (FCM yield).
  • Understanding the impact of selection on feed intake and efficiency is crucial for sustainable dairy farming.
  • Previous research has focused on yield, but correlated effects on feed efficiency require further investigation.

Purpose of the Study:

  • To evaluate the impact of a 16-year selection experiment for FCM yield on feed intake and gross feed efficiency in first-lactation Holstein cows.
  • To determine if selection for yield resulted in correlated changes in feed intake of concentrates, alfalfa hay, and corn silage.
  • To assess differences in body weight and weight change between selection and control groups.

Main Methods:

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  • Feed intakes (concentrates, alfalfa hay, corn silage) were measured from day 71 to 120 postpartum.
  • Body weight (BW) and weight change were monitored in first-lactation selection (n=36) and control (n=32) cows.
  • Gross feed efficiency was calculated over a 50-day period.

    • Main Results:

    • Selection cows had significantly higher corn silage intake, leading to higher estimated net energy intake.
    • Grain and hay intakes showed non-significant differences between selection and control groups.
    • Selection animals exhibited a 7.6% advantage in gross feed efficiency over the 50-day trial, with statistically nonsignificant differences in BW and weight change.

    Conclusions:

    • Selection for increased FCM yield in Holstein cows led to a desirable correlated improvement in gross feed efficiency.
    • Higher corn silage intake was the primary driver of improved energy intake and efficiency in selected cows.
    • Breeding programs for yield can positively influence feed utilization in dairy cattle.