Table 2. Survey-weighted proportion for culling reasons for 239 cows on six California dairies surveyed over a course of a year.
| Culling reason | Seasona | P value | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Summer (N = 60) | Fall (N = 60) | Winter (N = 59)b | Spring (N = 60) | Overall (N = 239)c | |||||||
| N | % (SE) | N | % (SE) | N | % (SE) | N | % (SE) | N | % (SE) | ||
| Low milk production | 40 | 59.88% (5.73) | 37 | 58.79% (5.18) | 35 | 69.09% (4.79) | 44 | 78.47% (3.52) | 156 | 65.87% (2.50) | 0.081 |
| Poor reproduction | 28 | 52.43% (6.25) | 20 | 40.52% (5.97) | 8 | 16.46% (4.61) | 18 | 31.97% (5.26) | 74 | 35.03% (2.79) | 0.010 |
| Lameness | 7 | 10.18% (2.97) | 8 | 15.29% (4.71) | 3 | 4.05% (1.87) | 7 | 10.65% (3.32) | 25 | 10.01% (1.73) | 0.151 |
| Mastitis | 0 | 0.00% (-) | 7 | 14.14% (4.67) | 10 | 11.40% (3.10) | 7 | 8.98% (2.19) | 24 | 8.93% (1.63) | 0.055 |
| Otherd | 14 | 21.65% (4.77) | 18 | 27.91% (5.32) | 20 | 32.66% (5.55) | 11 | 15.62% (3.57) | 63 | 25.23% (2.53) | 0.166 |
Notes.
a
Study year and seasons included summer (July 1–September 30, 2015), fall (October 1–December 31, 2015), winter (January 1–March 31, 2016) and spring (April 1–June 30, 2016).
b
Due to sample ID labelling error, 1 sample was not reconciled with dairy record (Herd 5, winter sample).
c
Totals and percents do not add up to 239 or 100%, respectively, due to multiple cull reasons.
d
The category labeled other reasons included the following conditions: unknown illness, gastrointestinal disorder, poor udder confirmation, undiagnosed fever, pneumonia or eye disease.