Rabbit hay: timothy vs alfalfa, when to switch

The hay is the foundation of the pet rabbit's diet, and the hay is the most important nutrient source for the rabbit's health, digestion, and dental health. The rabbit that is fed the right hay in the right amount at the right life stage is the rabbit that has a healthy digestive system, a healthy dental system, and a long, healthy life. The rabbit that is fed the wrong hay, or the right hay in the wrong amount, or the right hay at the wrong life stage, is the rabbit that is at risk of dental disease, obesity, GI stasis, and a shortened lifespan. The hay is not optional. The hay is the foundation.

This article is going to walk you through the practical hay management for rabbits — the difference between the two main hay types (timothy and alfalfa), the hay's role in the rabbit's nutrition and dental health, when to offer each hay, the quantity to offer, the storage and the freshness, the dental and digestive benefits, and the four mistakes that produce dental disease or obesity in the pet rabbit. I am an avian and exotic pet consultant, and the rabbit hay is one of the most common topics of my consultations. The cases that go well share a common feature: the owner has understood the hay's central role in the rabbit's diet, has provided the right hay in the right amount at the right life stage, and has managed the hay as a continuous, fresh resource. The cases that go poorly share a different common feature: the owner has treated the hay as a "filler" or a "treat" rather than as the primary nutrient source, and the owner has fed the wrong hay or the right hay in the wrong amount.

I want to be clear at the start: the rabbit is a strict herbivore, and the rabbit's digestive system is specifically adapted to a high-fiber, low-calorie, low-protein, low-fat diet of fresh grass and hay. The rabbit's teeth grow continuously (the rabbit's teeth grow 2–3 mm per week), and the rabbit's digestive system requires a constant flow of fiber to maintain the motility of the gut. The hay provides the fiber, the hay provides the chewing action that wears the teeth, and the hay provides the substrate for the gut microflora. The rabbit without the hay is the rabbit in chronic crisis.

The two main hay types: timothy and alfalfa

The two main hay types for pet rabbits are timothy hay and alfalfa hay. The two hays are not interchangeable, and the right hay depends on the rabbit's life stage and the rabbit's specific nutritional needs.

Timothy hay. The standard hay for adult rabbits. Timothy hay is a grass hay (Phleum pratense), with a long-strand fiber, a moderate protein content (8–12% on a dry-matter basis), a moderate calcium content (0.4–0.6% DM), a high fiber content (30–35% DM), and a low-to-moderate calorie content (1.5–1.8 kcal per gram). The timothy hay has the right nutrient profile for the adult rabbit's maintenance needs, and the timothy hay provides the long-strand fiber that the rabbit's digestive system requires.

Timothy hay is available in three cuttings, each with a slightly different nutrient profile and texture:

• First cutting: coarser, more stem, more fiber, lower protein and calories. The first cutting is the best for the rabbit's dental health (the coarser stems require more chewing and produce more tooth wear). The first cutting is also lower in calories, which is appropriate for the adult rabbit that is at risk of obesity.

• Second cutting: a balance of leaf and stem, moderate fiber, moderate protein, moderate calories. The second cutting is the most popular choice for the adult rabbit, and the second cutting is the cutting that most pet stores stock as "timothy hay."

• Third cutting: finer, more leaf, less fiber, higher protein and calories. The third cutting is more palatable (the rabbit prefers the finer texture and the higher leaf content) but less effective for dental wear. The third cutting is appropriate for the rabbit that needs to gain weight or for the rabbit that is a particularly picky eater.

Alfalfa hay. The hay for young, growing rabbits and for specific adult rabbits with special needs. Alfalfa hay is a legume hay (Medicago sativa), with a shorter-strand fiber, a higher protein content (15–20% DM), a higher calcium content (1.2–1.5% DM), a similar fiber content (30% DM), and a higher calorie content (2.0–2.4 kcal per gram). The alfalfa hay has a nutrient profile that is appropriate for the rapid growth of the young rabbit, but the nutrient profile is too rich for the adult rabbit.

The alfalfa hay's higher protein and higher calcium are the issue for the adult rabbit. The high protein can contribute to obesity (the adult rabbit has a lower protein requirement than the young rabbit), and the high calcium can contribute to urinary tract issues (the rabbit excretes the excess calcium through the urinary tract, and the high calcium in the urine can produce the calcium sludge or bladder stones that are common in adult rabbits). The alfalfa hay is the right hay for the young rabbit (under 6–7 months of age), but the alfalfa hay is the wrong hay for the adult rabbit.

The right hay for the right life stage

The right hay for the rabbit depends on the rabbit's life stage.

Young rabbits (under 6–7 months of age). The young rabbit is in a rapid growth phase, with the protein and the calcium requirements that support the bone and the muscle development. The young rabbit should be fed alfalfa hay (unlimited), with a small amount of timothy hay introduced at 3–4 months of age to allow the young rabbit to transition. The young rabbit should also be fed a small amount of alfalfa-based pellets (the young-rabbit pellets are higher in protein and calcium than the adult pellets).

Adult rabbits (7 months to 5 years of age). The adult rabbit is in a maintenance phase, with the protein and the calcium requirements that support the body condition. The adult rabbit should be fed timothy hay (unlimited), with the second cutting being the standard, and the first cutting being the best for dental health. The adult rabbit should be fed a small amount of timothy-based pellets (the adult pellets are lower in protein and calcium than the young-rabbit pellets). The adult rabbit should not be fed alfalfa hay (the high protein and high calcium are inappropriate for the adult).

Senior rabbits (over 5–6 years of age). The senior rabbit is in a phase of declining digestive efficiency, declining dental health, and (often) declining body weight. The senior rabbit should be fed timothy hay (unlimited), with the third cutting being preferred for the senior rabbit that is losing weight (the third cutting is more palatable and more calorie-dense). The senior rabbit with dental disease that cannot eat the long-strand hay may need to be transitioned to a chopped or a cubed hay, with the pellets and the fresh vegetables providing the bulk of the nutrition.

Pregnant or lactating does. The pregnant or lactating doe has the elevated protein and calcium requirements that support the pregnancy and the milk production. The pregnant or lactating doe should be fed alfalfa hay (unlimited), with a small amount of timothy hay, and with a high-quality alfalfa-based pellet. The transition back to timothy hay should occur at the time of weaning.

Rabbits with specific health conditions. The rabbit with chronic kidney disease should be fed a lower-calcium hay (timothy, not alfalfa). The rabbit with urinary tract issues (calcium sludge, bladder stones) should be fed a lower-calcium hay (timothy) and should be transitioned off alfalfa. The rabbit with dental disease may need to be fed a chopped or cubed hay, and may need a higher proportion of pellets and fresh vegetables to maintain the weight.

The quantity: unlimited is the right answer

The right quantity of hay for the adult rabbit is unlimited. The rabbit should have access to fresh hay 24/7, with the hay refreshed daily, and with the hay provided in a hay rack, a hay bin, or directly in the litter box (many rabbits like to eat hay while they are in the litter box, and the hay-in-litter-box arrangement supports both the hay consumption and the litter box training).

The unlimited hay is not a "filler." The unlimited hay is the primary nutrient source, and the unlimited hay provides:

• The fiber for the digestive health. The fiber maintains the gut motility, supports the gut microflora, and prevents the GI stasis that is the most common emergency in the rabbit.

• The chewing action for the dental health. The chewing of the long-strand hay wears the teeth at a rate that matches the tooth growth, and the chewing prevents the dental disease (the molar spurs, the malocclusion, the dental abscess) that is the second most common health problem in the rabbit.

• The low-calorie nutrition for the weight management. The hay is low in calories and high in fiber, and the hay supports the weight management of the adult rabbit that is at risk of obesity.

The rabbit that is fed unlimited hay is a rabbit that is, in most cases, a rabbit that maintains a healthy weight, a healthy digestion, and a healthy dental system. The rabbit that is fed a restricted amount of hay is a rabbit that is, in most cases, a rabbit that develops one or more of the hay-deficiency problems (obesity, dental disease, GI stasis).

The pellets are the supplement, not the primary food. The adult rabbit should be fed 1/4 cup of timothy-based pellets per 5 lbs of body weight per day, and the pellets should not be the primary source of nutrition. The pellets are calorie-dense and protein-dense, and the pellets can produce the obesity and the digestive problems that the hay prevents.

The storage and the freshness

The hay is a fresh product, and the hay loses its nutritional value and its palatability over time. The right storage of the hay:

• Store in a cool, dry, dark place. The hay should be stored in a location that is not exposed to direct sunlight, that is not exposed to moisture, and that is at a stable temperature (not a hot attic, not a damp basement). The sunlight degrades the vitamin content, the moisture produces mold, and the temperature extremes degrade the freshness.

• Store in a breathable container. The hay should be stored in a container that allows air circulation (a cardboard box, a paper bag, a breathable fabric bag). The hay should not be stored in a sealed plastic container (the moisture can be trapped, the mold can develop).

• Use within 3–6 months of the harvest date. The hay loses its nutritional value (especially the vitamin A and the vitamin E) over time, and the hay should be used within 3–6 months of the harvest date. The hay that is older than 6 months should be discarded (or used as bedding, not as food).

• Inspect the hay before feeding. The hay should be inspected for mold (the gray or white fuzz, the musty smell), for dust (the visible dust when the hay is shaken), and for foreign material (the sticks, the weeds, the debris). The hay that is moldy, dusty, or contaminated should be discarded.

The fresh, high-quality hay is the hay that is green (not brown or yellow), is fragrant (not musty or stale), is clean (not dusty or debris-laden), and is leafy (not just stems). The hay that is brown, musty, dusty, or stem-only is the hay that should be discarded.

The dental benefits in detail

The hay's role in the dental health of the rabbit is the most under-recognized benefit, and the dental benefit is one of the most important reasons for the unlimited hay. The rabbit's teeth grow continuously (2–3 mm per week), and the rabbit's teeth must be worn down at a rate that matches the growth. The wearing is accomplished by the chewing action, and the chewing action is most effectively provided by the long-strand hay.

The rabbit that is fed a diet of pellets and vegetables (without the long-strand hay) is a rabbit that does not chew enough, and the rabbit's teeth grow longer than the wearing rate. The teeth develop sharp points (spurs) on the molars, the spurs cut into the rabbit's tongue and cheeks, the rabbit stops eating because of the pain, the rabbit loses weight, and the rabbit develops the dental disease that requires veterinary intervention (the molar filing, the tooth extraction, the long-term management).

The rabbit that is fed unlimited long-strand hay is a rabbit that chews enough, and the rabbit's teeth are worn at a rate that matches the growth. The teeth do not develop the spurs, the rabbit does not develop the dental disease, and the rabbit maintains the dental health throughout the life.

The hay's role in the dental health is the reason that the hay is not optional, and the reason that the pellets are the supplement rather than the primary food. The pellets are soft, the pellets require minimal chewing, and the pellets do not provide the chewing action that the teeth need. The hay is hard, the hay requires significant chewing, and the hay provides the chewing action that the teeth need. The difference is the chewing. The chewing is the hay.

The four mistakes that produce dental disease or obesity in the pet rabbit

Mistake 1: Feeding alfalfa hay to an adult rabbit. The most common mistake. The owner feeds the alfalfa hay because the rabbit likes it (alfalfa is more palatable than timothy), and the owner does not realize that the alfalfa is too rich for the adult. The high protein and the high calcium produce the obesity and the urinary tract issues. The fix is to transition the adult rabbit to timothy hay, with the transition being gradual (mix the timothy with the alfalfa, increasing the proportion of timothy over 2–4 weeks).

Mistake 2: Restricting the hay in favor of the pellets. The second most common mistake. The owner fills the bowl with pellets, and the rabbit fills up on the pellets, and the rabbit does not eat enough hay. The rabbit develops the dental disease (because the pellets do not provide the chewing action) and the digestive problems (because the pellets do not provide the fiber). The fix is to limit the pellets (1/4 cup per 5 lbs of body weight per day for the adult rabbit), and to provide the hay unlimited.

Mistake 3: Feeding the wrong cutting of timothy hay. The third mistake. The owner feeds the third cutting (the most palatable, the highest in calories and protein), and the rabbit over-eats and gains weight. The fix is to feed the first or the second cutting, with the first cutting being the best for the dental health and the second cutting being the best for the palatability-and-balance.

Mistake 4: Not storing the hay properly. The fourth mistake. The owner stores the hay in a damp basement, in a sealed plastic bag, in a hot attic. The hay becomes moldy, dusty, or stale, and the rabbit refuses to eat the hay (or the rabbit eats the moldy hay and becomes ill). The fix is the proper storage, in a cool, dry, dark place, in a breathable container, with the use within 3–6 months.

The bottom line

The hay is the foundation of the rabbit's nutrition, the rabbit's dental health, and the rabbit's digestive health. The right hay for the right life stage is timothy for the adult, alfalfa for the young, and the right hay for the right rabbit depends on the specific rabbit. The right quantity is unlimited, and the right storage is cool, dry, dark, and breathable.

The rabbit that is fed the right hay, in the right amount, at the right life stage, is the rabbit that has a long, healthy, problem-free life. The rabbit that is fed the wrong hay, or the right hay in the wrong amount, or the right hay at the wrong life stage, is the rabbit that is at risk of dental disease, obesity, GI stasis, and a shortened lifespan. The difference is the hay. The hay is the framework above. The framework, applied with consistency, is the right prevention.

The owner who invests in the right hay and the right feeding protocol is the owner who has a rabbit that is healthy. The owner who does not invest is the owner who has a rabbit that is at risk. The difference is the investment. The investment is the framework above. The framework, applied with consistency, is the right prevention.

The rabbit that is well-managed is a rabbit that is a long-term companion, a source of joy, and a low-cost pet to maintain. The rabbit that is poorly managed is a rabbit that is a source of veterinary bills, a chronic worry, and a shortened life. The difference is the management. The management is the framework above. The framework, applied with consistency, is the right prevention.

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About the author

Ravi Patel is an avian and exotic pet consultant with a focus on the husbandry, welfare, and nutritional management of small mammals, with a particular interest in the practical application of evidence-based nutrition to the long-term health of rabbits, guinea pigs, and other herbivorous small mammals. He has worked with private owners, exotic pet rescues, and zoological collections across temperate North America and South Asia, and writes regularly on the day-to-day realities of keeping small mammals healthy and engaged.