Concentration of phytic acid in faeces of calves fed starter diets
2001
Duskova, D. | Marounek, M. (Akademie Ved, Prague (Czech Republic). Ustav Zivocisne Fyziologie a Genetiky) | Dvorak, R. | Rada, V. | Doubek, J.
The aim of our study was to decide whether phytic acid hydrolysis in the digestive tract of calves is complete or not. Rectal samples of faeces were collected from 16 crossbred calves fed starter diets and aged l, 6 and 13 weeks. The phytic acid concentration was determined by capillary isotachophoresis. Two commercial starters containing 9.17 and 12.80 g of phytic acid per kg of dry matter (37.6 and 50.1 % of the total P) were offered ad libitum from the 4th day of life. Calves were weaned at the age of 6 weeks. Phytic acid was determined in 30 out of 37 faecal samples. Its concentration varied widely from 1 mg to 2.34 g per kg of dry matter. In some samples, the quantity of phytic acid was insufficient for a precise determination. Phytic acid phosphorus represented 0 to 8.9 % of the total P in faeces. The highest phytic acid concentrations were found in faeces of calves at the age of 6 weeks, just after weaning. On average, faeces of l, 6 and 13 weeks old calves contained 8 +/- 4, 477 +/- 265 and 275 +/- 211 mg of phytic acid per kg DM, respectively. It can be concluded that a part of ingested phytic acid apparently escapes the hydrolysis in the digestive tract of calves fed commercial starters.
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