Effect of ryegrass hay and ryegrass silage, cut at two stages of development, on nutrient digestibility, nitrogen balance, and purine derivative excretion in growing sheep by Gonzalez-Ronquillo, Manuel, Robles-Jiménez, Lizbeth E., Romero-Bernal, Jose, Ariciaga-Gonzalez, Cynthia, Valdez-Ramírez, Bulmaro, Chay-Canul, Alfonso J., Vargas-Bello-Pérez, Einar

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