It appears to reflect the status of the AA-pool. Fi1 2 is related to branched chain AA, FA 9 concerns Tyrosin and Phenylalanin, and also Taurin and Threonine. All factors show highly significant differences between young steers and calves.
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The influence of nutrition (energy and digestible crude protein) on some blood parameters, health and fertility in late pregnant milking cows
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