Evaluation of titanium dioxide as a digestibility marker for cattle

Area of Science:

• Animal Science
• Nutritional Physiology
• Ruminant Metabolism

Background:

• Digestibility markers are crucial for evaluating cattle feed efficiency.
• Titanium dioxide (TiO2) and chromic oxide (Cr2O3) are commonly used markers.
• Accurate digestibility measurements are vital for optimizing livestock nutrition and production.

Purpose of the Study:

• To evaluate titanium dioxide (TiO2) as a reliable digestibility marker in cattle.
• To compare the efficacy of TiO2 with chromic oxide (Cr2O3) in digestibility studies.
• To assess the impact of different diets and feeding methods on marker recovery and accuracy.

Main Methods:

• Three experiments involving steers were conducted using prairie hay and corn-based diets.
• Fecal samples were analyzed for titanium dioxide (TiO2) and chromic oxide (Cr2O3) recovery.
• Digestibility was calculated using marker-based methods and compared to total fecal collection.

Main Results:

• Fecal recovery of TiO2 averaged 90-95% across studies, with no significant effect of supplements in one trial.
• TiO2 underestimated digestibility in corn-based diets (Exp. 2 and 3) compared to total fecal collections.
• Chromic oxide (Cr2O3) showed variable recovery and accuracy, overestimating digestibility in one study and being accurate in another.

Conclusions:

• Titanium dioxide (TiO2) shows promise as a digestibility marker for cattle but requires further investigation.
• Underestimation of digestibility by TiO2 in certain diets necessitates careful consideration for its application.
• Additional research is warranted to fully determine the utility and limitations of TiO2 in cattle digestibility assessments.