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Protein and methionine hydroxy analog for lactating cows

P T Chandler, C A Brown, R P Johnston

    Journal of Dairy Science
    |November 1, 1976
    PubMed
    Summary
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    Adding methionine hydroxy analog to dairy cow rations improved fat production and reproductive efficiency, especially when combined with lower protein levels. This highlights the importance of methionine for dairy cow health and productivity.

    Area of Science:

    • Animal Science
    • Dairy Nutrition
    • Reproductive Physiology

    Background:

    • Dietary protein and methionine are crucial for dairy cow productivity and health.
    • Optimizing nutrient levels, including methionine hydroxy analog, can impact milk production and reproductive outcomes.
    • Understanding the interplay between protein and methionine is essential for formulating effective dairy rations.

    Purpose of the Study:

    • To evaluate the effects of dietary protein and methionine hydroxy analog on dairy cow performance.
    • To determine the optimal levels of protein and methionine hydroxy analog for lactation.
    • To investigate the impact of these nutrients on milk production, body weight, and reproductive efficiency.

    Main Methods:

    • A 2x2 factorial experiment involving 144 cows over one lactation.

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  • Rations varied in protein (12.5% and 15.5%) and methionine hydroxy analog (0% and 0.125% dry matter).
  • Constant levels of fiber, sulfur, calcium, phosphorus, and salt were maintained.

    • Main Results:

    • No significant effects on dry matter intake, milk production, energy conversion, or body weight changes.
    • Higher protein rations decreased crude protein conversion efficiency into milk protein.
    • Methionine hydroxy analog supplementation improved fat-corrected milk production and reproductive parameters (services per conception, days open), particularly at lower protein levels.

    Conclusions:

    • Methionine hydroxy analog supplementation positively impacts dairy cow reproductive efficiency and milk fat production.
    • The benefits of methionine hydroxy analog are most pronounced when fed with lower protein rations.
    • Further research into the ruminal and post-ruminal effects of methionine is warranted.