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Related Experiment Videos

Protein sources evaluated for ruminating Holstein calves.

E Zerbini, C E Polan

    Journal of Dairy Science
    |June 1, 1985
    PubMed
    Summary

    Soybean meal and fish meal significantly improved calf growth rates compared to corn gluten or cottonseed meal. These protein supplements enhanced weight gain and nutrient utilization in young ruminants.

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    Area of Science:

    • Animal Nutrition
    • Ruminant Physiology
    • Feed Science

    Background:

    • Optimizing protein sources is crucial for calf growth and development.
    • Understanding the impact of different protein supplements on nutrient metabolism is essential for efficient livestock production.

    Purpose of the Study:

    • To evaluate the efficacy of various protein supplements (soybean meal, corn gluten meal, cottonseed meal, fish meal) in calf diets.
    • To assess the effects of these protein sources on growth performance, nutrient digestibility, and rumen fermentation parameters.

    Main Methods:

    • Fifty calves were assigned to five dietary treatments: a basal diet or a 15.5% crude protein diet supplemented with soybean meal, corn gluten meal, cottonseed meal, or fish meal.
    • Diets were formulated for 75% total digestible nutrients.
    • Rumen degradability was assessed using the dacron bag technique.
    • Measurements included body weight gain, ruminal ammonia-nitrogen, volatile fatty acids, serum urea nitrogen, abomasal microbial nitrogen, and apparent nutrient digestibilities.

    Main Results:

    • Body weight gain increased by an average of 17% with supplemental protein, with fish meal and soybean meal yielding the highest gains.
    • Ruminal ammonia-nitrogen was higher for soybean meal and cottonseed meal, indicating greater degradability.
    • Apparent dry matter and nitrogen digestibilities were higher for corn gluten meal and fish meal diets.
    • Rumen degradability varied, with soybean meal showing the highest (71.3%) and corn gluten meal the lowest (38.1%).

    Conclusions:

    • Fish meal and soybean meal are superior protein sources for promoting growth in ruminating calves compared to corn gluten meal and cottonseed meal.
    • Dietary protein supplementation significantly impacts calf growth and nutrient utilization.
    • The degradability of protein supplements influences rumen fermentation and overall diet effectiveness.

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