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18 months acute agouti animals average Bacterial birth black body breeders breeding cage cavity cavy colony color patterns containing contract creolin dark days destroyed develop diarrhea different color Dipping disease disinfect distinctly domestic drugs eating effective enlarged epidemic eradicate estrous cycle Estrus experimental feed feet Female guinea pigs Figure five or six food fresh gallons of water gestation period GOVERNMENT PRINTING OFFICE grain ration grass greens guinea pig varies hemorrhagic hours inches high infection known laboratory Lice litter liver lymph glands male mates mice moisture months of age Mortality natives nest numbers ounces outbreak paralysis patches pens percent gamma Peru Peruvian pneumonia pound premises produce Pseudotuberculosis Raising Guinea Pigs rats respiratory rodent separate sexually mature short hair Silky solid color sometimes caused species spleen spread stock supply teeth temperatures lower tiers tissue Tortoise-shell treatment upper usually varieties vegetables Virus vitamin weeks of age weight wettable white young