An adult German Lop Rabbit's diet should be centered on unlimited grass hay, which constitutes approximately 80 percent of total intake by volume. Timothy hay is the most commonly recommended variety, though orchard grass, meadow hay, and botanical hay blends are equally suitable and can be rotated to maintain the rabbit's interest. The continuous lateral grinding motion required to process long-stem hay is essential for even wear of the continuously growing molars, making hay the single most important component in preventing dental disease throughout the adult years.
Pellets should be fed in measured, controlled portions during adulthood. The higher-protein, higher-calorie pellets appropriate for a growing juvenile are replaced by a standard maintenance formula containing approximately 14 percent crude protein, a minimum of 18 to 20 percent crude fiber, and no more than two percent fat. For a German Lop at its ideal weight of six to eight pounds, a daily pellet ration of approximately one-quarter cup is sufficient. Overfeeding pellets is one of the most common dietary errors in adult rabbit care and leads directly to obesity, which in turn stresses the joints, liver, and cardiovascular system.
Fresh vegetables should be offered daily as a supplemental source of hydration, vitamins, and dietary variety. A rotation of leafy greens such as romaine lettuce, cilantro, parsley, basil, dill, and dandelion greens provides a broad micronutrient profile without excessive sugar or starch. Introduce new vegetables one at a time, monitoring droppings for two to three days to confirm digestive tolerance. Root vegetables and fruit should be reserved as occasional treats in very small quantities due to their sugar content. A tablespoon-sized portion of carrot, apple, or banana once or twice per week is ample.
Fresh water must be available at all times, provided through a clean ceramic crock, a gravity-fed bottle, or both. An adult German Lop in good health consumes a surprisingly large volume of water daily, and dehydration is a leading contributor to gastrointestinal stasis and urinary sludge, two conditions to which rabbits are inherently vulnerable. Wash water containers with hot water and a bottle brush every day, and replace the water completely rather than simply topping off, to prevent bacterial contamination and biofilm.