Metabolic studies in rats of 75Se incorporated in vivo into fish muscle

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Abstract
1. Twenty-four energy and nitrogen balances were determined using twenty-four crossbred cows (Brown Swiss × Sahiwal) during their midstage of lactation. Energy balances were estimated by subtracting milk energy and heat production from the metabolizable energy (me) intake. Heat production was estimated by indirect calorimetry, by collection and analysis of respiratory gases. The cows were given amounts corresponding to 90, 110 and 130 % of the me and 90 and 110% of the digestible crude protein (DCP) standards of the (US) National Research Council (1966).