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Rumen-Protected Fat and Rumen-Protected Choline Co-Supplementation: Impacts on Performance and Meat Quality of

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Supplementing lambs with rumen-protected choline alongside rumen-protected fat improved feed intake and meat quality. This combination mitigated some negative effects of fat supplementation on fatty acid profiles in lamb meat.

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Area of Science:

  • Animal Science
  • Nutritional Science
  • Meat Science

Background:

  • Rumen-protected fat and choline are used in animal feed to improve nutrient utilization.
  • Understanding their combined effects on lamb performance and meat characteristics is crucial for optimizing production.

Purpose of the Study:

  • To evaluate the impact of co-supplementing rumen-protected fat and rumen-protected choline on lamb growth, carcass traits, and meat quality.
  • To determine if rumen-protected choline can mitigate potential negative effects of rumen-protected fat on feed intake and meat fatty acid composition.

Main Methods:

  • A randomized experimental design was used with 45 Tian×Hu crossbred lambs.
  • Three dietary treatments were applied: basal diet (CON), rumen-protected fat (RPF), and rumen-protected fat plus rumen-protected choline (RPFC).
  • Growth performance, dry matter intake (DMI), carcass traits, meat quality (fatty acid profile, color), and serum lipid levels were analyzed.

Main Results:

  • Neither RPF nor RPFC significantly affected overall growth performance.
  • RPFC increased DMI by 5.3% compared to RPF (p < 0.05).
  • RPF altered fatty acid profiles in Longissimus lumborum, decreasing saturated and increasing unsaturated fats, while RPFC increased C16:1 and reduced C18:2n-6t.
  • Both RPF and RPFC increased serum HDL and total cholesterol.
  • RPFC improved meat color (b* value) and reduced C18:2n-6t compared to RPF.

Conclusions:

  • Rumen-protected choline supplementation can enhance feed intake in lambs fed rumen-protected fat.
  • Co-supplementation modifies the fatty acid profile of lamb meat, potentially improving its nutritional quality.
  • Rumen-protected choline mitigates some of the adverse effects of rumen-protected fat on feed intake and meat characteristics.