Both alfalfa and Timothy hay are commonly used as forage for rabbits, but they have different nutritional profiles and suitability depending on the age and health of your rabbits. Here's a comparison to help you understand which might be better for your rabbits:

1. **Alfalfa Hay**: Alfalfa hay is higher in protein, calcium, and calories compared to Timothy hay. It is a good choice for growing rabbits, pregnant or lactating does, and rabbits that require higher nutrient levels. However, its high calcium content may not be suitable for adult rabbits or those prone to urinary issues, such as bladder sludge or stones. Additionally, the higher calorie content of alfalfa can lead to obesity in less active or older rabbits.

2. **Timothy Hay**: Timothy hay has a lower protein and calcium content compared to alfalfa. It is a more suitable choice for adult rabbits and those with specific dietary needs, such as overweight or urinary issue-prone rabbits. Timothy hay is also closer to the natural diet of rabbits in terms of fiber content and helps promote good dental health by encouraging chewing and wearing down teeth.

In general, providing a variety of hay types, including Timothy hay, is beneficial for your rabbits as it ensures a balanced diet and provides different textures and flavors.

It's important to note that individual rabbits may have unique dietary requirements or health conditions. Consulting with a veterinarian who specializes in rabbit care can provide personalized advice based on your rabbits' specific needs. They can help you determine the most appropriate hay type and recommend any necessary dietary adjustments.