Table 7.
Retention Times for Sand Particles in Dairy Cows (Days)
Particle Size (um)
200
Retention Time
20
80
Mean Retention Time*
0.8
3.2
3.9
5.2
Average Time for 50%
1.7
3.5
4.2
5.1
1.4-1.8
2.5-6.0
2.7-7.0
3.0-7.5
Average Retention
1.8
5.0
6.0
7.3
Average Time for 90%
2.8
7.6
8.7
10.0
2.2-3.2
5.5-9.7
5.5-11.2
Excretion**
Range
Time***
Excretion**
Range
450
6.4-11.5
*Calculated as 1.44 times the average half-time given in Table 5.
**Time required after dosing to excrete X% of the particles, average and
range for experimental data.
**kkTime required after dosing to excrete 67% of the particles, from experimental data.
162