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J.E.P. Santos. (1998) Protein nutrition of dairy cattle. New Zealand Veterinary Journal 46:6, pages 240-240.
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Marilia Alves, Félix González, Nelcy Carvalho, Paulo Mühlbach, Verônica Lima, Tiago Reis Conceição & Vera Wald. (2004) Feeding dairy cows with soybean by-products: effects on metabolic profile. Ciência Rural 34:1, pages 239-243.
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N.E. Geerts, D.L. De Brabander, J.M. Vanacker, J.L. De Boever & S.M. Botterman. (2004) Milk urea concentration as affected by complete diet feeding and protein balance in the rumen of dairy cattle. Livestock Production Science 85:2-3, pages 263-273.
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Niels Martin Nielsen, Troels Kristensen, Peder Nørgaard & Hanne Hansen. (2003) The effect of low protein supplementation to dairy cows grazing clover grass during half of the day. Livestock Production Science 81:2-3, pages 293-306.
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P.J. Rajala-Schultz & W.J.A. Saville. (2003) Sources of Variation in Milk Urea Nitrogen in Ohio Dairy Herds. Journal of Dairy Science 86:5, pages 1653-1661.
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W.R. Butler. (2018) Nutritional effects on resumption of ovarian cyclicity and conception rate in postpartum dairy cows. BSAP Occasional Publication 26:1, pages 133-145.
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