Fertility in Gyr Cows (Bos indicus) with Fixed Time Artificial Insemination and Visual Estrus Detection Using a Classification Table
Table 2
tests for factors associated with FSF in cows inseminated under two artificial insemination protocols (SC-FTAI and NSE-AI).
Factor levels
Diagnosis
Total
test value
Pregnant
Open
%
%
%
SC-FTAI
46
42.20
63
57.80
109
100.00
()
NSE-AI
45
41.67
63
58.33
108
100.00
Total ()
91
41.94
126
58.06
217
100.00
PPA ≤ 100 d
17
42.50
23
57.50
40
100.00
()
PPA > 100 d
74
41.81
103
58.19
177
100.00
Total ()
91
41.94
126
58.06
217
100.00
DMY ≥ 6 k/L/d
72
46.15
84
53.85
156
100.00
()
DMY < 6 k/L/d
19
31.15
42
68.85
61
100.00
Total ()
91
41.94
126
58.06
217
100.00
BCAI ≥ 2.5
71
42.51
96
57.49
167
100.00
()
BCAI < 2.5
20
40.00
30
60.00
50
100.00
Total ()
91
41.94
126
58.06
217
100.00
CN ≤ 3
37
38.95
58
61.05
122
100.00
CN > 3
54
44.26
68
55.74
95
100.00
()
Total ()
91
41.94
126
58.06
217
100.00
SC-FTAI: synchronized cows and fixed time artificial insemination, NSE-AI: natural estrus observation applying rating score table, PPA: postpartum anestrous, DMY: daily milk yield, BCAI: body condition at AI time, and CN = calving number.
