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Table 3 Mean dates ± S.E.M. (in days) of beginning, end and durations of ovulatory inactivity in mares kept under the 3 experimental diets and under natural photoperiod.

From: Effects of nutritional cues on the duration of the winter anovulatory phase and on associated hormone levels in adult female Welsh pony horses (Equus caballus)

   Ovarian inactivity
1st winter
Ovarian inactivity
2nd winter
Ovarian inactivity
3rd winter
Mean duration (days)
(2) (3)
WF Beginning 21 Nov ± 12 31 Dec ± 10 14 Jan ± 25  
  End 22 March ± 17 28 March ± 12 26 April ± 23  
  Duration (1) 119 ± 37 (4/10) 87 ± 17 (4/9)* 103 ± 13 (3/9) 103.0 40.4
R Beginning 21 Nov ± 11 22 Sep ± 10 27 Oct ± 4  
  End 21 May ± 7 15 May ± 6 21 May ± 4  
  Duration (1) 180 ± 15 (8/10) 235 ± 13 (10/10) 206 ± 7 (10/10) 207.3 194.2
V Beginning 16 Nov ± 5 14 Nov ± 7 03 Nov ± 9  
  End 6 May ± 9 2 May ± 10 13 May ± 6  
  Duration (1) 171 ± 12 (8/10) 169 ± 15 (8/10) 193 ± 8 (8/10) 178.0 141.0
  1. (1) (Number of mares presenting winter ovarian inactivity/total number of mares).
  2. (2) With only the mares presenting winter inactivity taken into account.
  3. (3) With all the mares in the group taken into account.
  4. * After an accidental fracture, one mare was removed from the experiment.