DCADSDefense Contract Action Data System
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References in periodicals archive ?
A significant increase (p < 0.01) in urinary Ca, P, Cl and S was recorded in cows fed +200 compared to +400 DCAD diet (Table 5).
Cows fed -100 DCAD had lower (p < 0.01) DMI during 15, 10, 5 and 2 d prior to parturition (Table 2).
Four episodes of hypocalcemia were observed in cows fed +100 DCAD diet, but no hypocalcemia occurred in the cows fed -100 DCAD diet.
The negative DCAD diet may have overcome the capacity of kidneys to excrete sufficient [H.sup.+] to maintain a constant blood pH, resulting in a slight systemic acidosis (Tucker et al., 1992).
(1991) who stated that increased DCAD level (-116 to +312 mEq/kg DM) did not affect the plasma sodium and potassium concentrations significantly.
The increased plasma Ca level for cows consuming -100 DCAD diet compared to those receiving +100 DCAD diet might be due to mild metabolic acidosis induced by negative DCAD concentration.
The increased plasma Mg concentration in cows fed -100 DCAD may result from their higher Mg intake in close-up diets.
(1988; 1992) who reported increased excretions of Na and K as the DCAD level increased from -20 to 10 mEq/100 g of DM, while Cl and S excretions decreased.
(1992) who reported increased urinary Na and K concentrations at high DCAD levels while its reverse was true for Cl concentration.
Increased urinary Mg in cows fed -100 DCAD diet might be attributed to improved absorption because Mg absorption increased as DCAD level decreased.
Decreased DMI in cows fed negative DCAD diet during the days prior to parturition might be attributed to low rumen pH demonstrated by Tucker et al.
Increased DMI by cows fed +400 DCAD might be attributed to increased blood HC[[O.sub.3].sup.-], acid-base balance (Sanchez and Beede, 1994) and rumen pH (Tucker et al., 1991).