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Table 5 Number of days from calving to first insemination, number of days open and number of AI until conception for all cows in treatment groups A, B and C.

From: Effects of a single administration of prostaglandin F2alpha, or a combination of prostaglandin F2alpha and prostaglandin E2, or placebo on fertility variables in dairy cows 3–5 weeks post partum, a randomized, double-blind clinical trial

Calving to first insemination all cows Group of cows without CL p-value
A 65 ± 24 62 ± 18 all cows: p = 0.306
without CL:
p = 0.034
B 68 ± 23 71 ± 20  
C 64 ± 19 67 ± 16 A-B: p = 0.024*
A-C: p = 0.406*
B-C: p = 0.953*
Days open    
A 95 ± 46 93 ± 44 all cows: p = 0.947
without CL:
p = 0.802
B 97 ± 49 98 ± 45  
C 100 ± 53 97 ± 44  
Number of AI until conception    
A 1.8 ± 1 1.7 ± 0.9 all cows: p = 0.582
without CL:
p = 0.915
B 1.8 ± 1 1.7 ± 1  
C 1.9 ± 1.2 1.7 ± 1  
  1. A is (PGF + E2), B is placebo and C is PGF alone (mean ± SD) for all cows and group of cows without CL. Level of significance is p = 0.05 and with Bonferroni adjustment p < 0.017. * indicates the p-values for pairwise group comparisons of cows without CL.