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Grass should not be a replacement for hay but can be a supplement to hay.
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Why is that? Technically it should be healthier than hay because it contains the same vitamins/minerals plus the ones that are lost when dried and lowers the risk of impaction or dehydration issues from the increased water content. Grazing herbivores on grass with limited to no hay are usually healthier with shinier coats and less digestive tract issues than those fed on a diet higher in hay than grass. The only issue is that you can't suddenly start feeding high amounts of grass. At minimum it causes diarhea but for some animals it can be life threatening. The grass needs to be increased slowly especially the new growth in spring but that doesn't mean you can't eventually feed unlimited grass without any health problems. Guinea pigs evolved to forage on fresh greens all day.
Currently mine are getting over a pound of grass each per day (I dump it into the cage by the grocery sack full) and a handful of hay in case they run out before I get a fresh bag full the next morning. All last summer they did not eat any hay. Only fresh grass and forages. I don't order hay from midspring to late fall now that I have an unlimited supply of safe grass for them.