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June 15, 2026Journal of Dairy ScienceOpen Access

The effect of the type of protein supplementation on splanchnic and mammary metabolism of dairy cows fed grass silage-based diets

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Authors

CRC. RoyAgriculture and Agri-Food CanadaDOD.R. OuelletAgriculture and Agri-Food CanadaDPD. PellerinUniversité Laval

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Implication

Randomized trial investigates protein source effects on milk yield in dairy cows, suggesting canola meal is viable.

Key Points

  • The study aims to evaluate how different protein supplements impact milk protein yield and nutrient metabolism in dairy cows fed grass silage diets.
  • Experiment conducted with 6 Holstein cows using a double 3 × 3 Latin square design over 3 periods.
  • Cows were fed three diets: soybean meal, canola meal, or canola meal with urea, with blood and milk samples taken during the trial.
  • Nutrient fluxes were measured across various organs to assess metabolism and efficiency.
  • Milk protein yield was higher with canola meal compared to soybean meal, despite lower estimated metabolizable protein supply (2591 vs. 2779 g/d).
  • Excess ruminal degradable protein supply decreased nitrogen utilization efficiency and increased plasma urea but did not impact milk protein yield.
  • Measurements showed that canola meal supported adequate nutrient fluxes without the negative impacts predicted by NRC.

Cite This Study

Roy et al. (2026) studied this question.

synapsesocial.com/papers/6a2f966ca1cfeec490827e0chttps://doi.org/10.3168/jds.2026-28332
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Also Consider

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