Table 1 Mean ± SD of parity, milk yield/ton, services/conception, days open and estradiol in dairy cows calving during winter/heat stress with and without retained fetal membranes

Number of cows

117

6

138

29

Number of samples

234

18

276

87

Prevalence

95.12%^d

4.88%^a

82.26%^c

17.37%^b

0.0001

Milk yield/ton

7.87 ± 1.79^b

8.00 ± 1.03^b

6.87 ± 2.41^a

8.43 ± 1.29^b

0.0001

Parity

2.67 ± 1.49^a

3.00 ± 0.47^a

3.04 ± 1.63^a

4.93 ± 2.24^b

0.0001

Services/conception

1.35 ± .63^a

1.52 ± .51^ab

1.79 ± .80^b

3.14 ± 1.20^c

0.0001

Days open

65.66 ± 11.68

65.34 ± 5.41

69.35 ± 15.57

69.66 ± 18.95

NS

Estradiol pg/ml

982 ± 4.92^d

836 ± 16.06^a

953 ± 6.93^c

898 ± 9.81^b

0.0001