Thunderbrook Gentle Gain. Thunderbrook Gentle Gain Composition Sainfoin (58.5%), Rice bran (32%), Linseed, Yeast product (4%), Monocalcium phosphate, Magnesium oxide. Thunderbrook Gentle Gain Analytical Constituents Crude Protein 15.1% Crude Fat 8.7% Crude Fibre 21.2% Crude Ash 10% Sugar 4.5% Starch, 10.7%, Calcium 1.31%, Phosphorus 0.92%, Sodium 0.42%, Potassium 1.91%, Magnesium 0.66%.
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