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Hay is made from grasses that are planted and grown specifically for animal feed. The plants are allowed to grow to a certain level of maturity then cut, let to sun dry, then â¦baled. Hay can also be made from several species of legumes such as Alfalfa , clover, and a few others. 3 people found this useful.
Rating Newest Oldest. Best Answer: Both grass and hay contain vitamin C as do almost all green plant based foods to a greater or lesser degree. The best source of vitamin C is fresh, C supplemented guinea pig chow.Despite the garbage you read on the web, hay does not need to be 80% of a guinea pig's diet.est Answer: Both grass and hay contain vitamin C as do almost all green plant based foods to a greater or lesser degree.