Digestibility of total and phytate phosphorus in young calves
Skrivanova, V.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic)) | Marounek, M.(Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic))E-mail:[email protected] | Dvorak, R.(Veterinarni a Farmaceuticka Univ., Brno (Czech Republic). Klinika Chorob Prezvykavcu)
Two experiments were conducted to determine the digestibility of total and phytate phosphorus in young calves. In the 1st experiment, 14 male calves received a commercial milk replacer (6 L of milk per day) and had free access to a starter concentrate. In the 2nd experiment, 21 male calves were fed ad libitum a milk replacer (Group I), milk replacer and starter concentrate (Group II), or milk replacer and maize cobs silage (Group III). The measurements were carried out at the age of 10 weeks (1st experiment), and 12 and 16 weeks (2nd experiment). Phytate P was assayed by capillary isotachophoresis. In the 1st experiment, phytate P accounted for 27.0% of the total P intake. On average, 27.9% of ingested P, but only 3.0% of phytate P were recovered from the faeces. The proportion of phytate P in total faecal P was 5.8%. In the 2nd experiment, phytate P accounted for 8.9, 13.8 and 8.6% of total P in diets of calves of Group I, II and III, respectively. On average, 6.6% of ingested P and 3.6% of phytate P were recovered from the faeces. Dry matter of faeces contained total P, phytate P and phosphate P at 9.74, 0.65 and 4.69 mg/g, respectively. Faecal concentrations of total P significantly correlated with those of calcium (r=0.71). It can be concluded that young calves utilised phytate P very efficiently as no more than a few % of phytate escaped degradation in the digestive tract.
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