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). IZ PIB-INRA Ruminant Nutrition Allowances (in Polish). Ed.: National Research Institute of Animal Production, Kraków. Subnel A. P. J., Meijer R. G. M., Straalen W. M., Van Taminga S. (1994). Efficiency of milk protein production in the DVE protein evaluation system. Livest. Prod. Sci., 40: 215-224. Śliwiński B. (2007). Effect of silage from sorghum grown in monoculture on cow's yield and milk composition. Report from research project no. 2235.1/2007. Ed.: National Research Institute of Animal Production, Kraków. Śliwiński B., Brzóska F. (2006). History of sorghum

References Arendarski J. (2003). Measurement of uncertainty. (in Polish). Oficyna Wydawnicza Politechniki Warszawskiej (Ed.), Warszawa. Barowicz T., Pietras M. (1999). Cholesterol content and fatty acids composition in longissimus dorsi muscle of fatteners fed Ca-fatty acids of linseed oil. Proc. International scientific conference to commemorate the 50th anniversary of ART Olsztyn (1950-2000): Current problems on pig production, 6-7.05.1999, pp. 110-111. Brzóska F. (2004 a). Effect of copper inhibitors in diet on cowsyield, milk composition and cholesterol

., Special Number, pp. 318-325. Brzóska F., Łojewska A., Brzóska B., Zyzak W. (2001 b). The effect of salt licks with microelements on their level in cow’s blood serum and cow’s milk (in Polish). Rocz. Nauk. Zoot., 28: 83-92. Brzóska F., Pietras M., Brzóska B. (2003). Effect of licks and mineral mixtures with iodine on cows yield, iodine content of milk, milk nutrients and blood constituents. Ann. Anim. Sci., 3: 55-66. Brzóska F., Szybiński Z., Śliwi ński B. (2009). Iodine concentration in Polish milk - variations due to season and region. Endokrynol. Pol., 60: 449