Effect of Using Faba Bean and/or Italian Ryegrass in Total Mixed Rations to Dairy Cows

Area of Science:

• Animal Science
• Dairy Nutrition
• Sustainable Agriculture

Background:

• The livestock industry faces pressure to reduce feeding costs and enhance sustainability, aligning with European Green Deal objectives.
• Legume silages offer a potential strategy to improve feed efficiency and environmental impact in dairy farming.
• Evaluating alternative feed sources is crucial for optimizing dairy cow diets.

Purpose of the Study:

• To assess the impact of faba bean, Italian ryegrass, and their intercrop silages on dairy cow voluntary intake, milk production, and milk composition.
• To investigate the effects of different silage-based diets on milk urea and fatty acid profiles.
• To provide insights into sustainable feeding practices for dairy cows.

Main Methods:

• Three total mixed rations (TMR) utilizing faba bean (FB), Italian ryegrass (IR), or a faba bean-Italian ryegrass intercrop (FBIR) silage were formulated.
• A 3 × 3 Latin square design was employed with nine Friesian cows over three periods, receiving diets ad libitum with grazing and concentrate supplementation.
• Dry matter intake, milk yield, milk composition (including urea), and milk fatty acid profiles were analyzed.

Main Results:

• No significant differences were observed in dry matter intake among the dietary groups.
• Milk production and general milk composition remained unaffected by the silage type, with the exception of milk urea content, which was higher in cows fed the faba bean diet.
• Milk fatty acid analysis revealed significant differences: the faba bean diet led to lower saturated fatty acids and higher conjugated linoleic acid (CLA) content compared to the other diets.

Conclusions:

• Faba bean silage inclusion in dairy cow diets can modify milk's fatty acid profile, increasing beneficial CLA and reducing saturated fats, despite a rise in milk urea.
• While not impacting overall milk yield or intake, legume-based silages present an avenue for targeted nutritional improvements in dairy production.
• Further research is warranted to optimize faba bean silage utilization for enhanced milk quality and reduced environmental footprint in dairy farming.