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[Fat/protein ratio in the milk of cattle herds in which displacement of the abomasum occurs].

The fat:protein ratio of the milk was calculated for 27 herds in Hessia breeding German Black Pied Cattle, in which displacement of the abomasum occurred (case herds) and in 27 similar herds, in which displacement of the abomasum did not occur (control herds). This was measured for the year preceding the displacements as well as for the month in which displacement occurred. Control herds were selected which had the same number of lactating cattle and the same milk yield (lbs). In herds where displacement of the abomasum occurred the fat:protein ratio of the milk in the year before the displacement was significantly higher than in herds free of displacement, and also tended to be higher in the month before. This implies that herds in which displacement occurred received less energy-rich carbohydrates than herds in which displacement was not seen.