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Table 5 The percentage of horses in a group showing increased vigilance during the first 30 s of a test period

From: The intensity of physiological and behavioral responses of horses to predator vocalizations

Horse

pedigree group

Prestimulus period

Stimulus period

Poststimulus period

Wolf sound

Head oriented towards the source of the sound

  ¾TB

-

33ax

17ay

  ½TB

-

71bx

28aby

  ¼TB

-

50abx

33bx

Elevated neck

  ¾TB

0ax

50ay

17ay

  ½TB

0ax

43ay

14az

  ¼TB

0ax

67ay

33cz

Elevated tail

  ¾TB

0ax

33ay

0ax

  ½TB

0ax

28ay

0ax

  ¼TB

0ax

0bx

0ax

Vocalization – alarm snort

  ¾TB

0ax

0ax

0ax

  ½TB

0ax

0ax

0ax

  ¼TB

0ax

0ax

0ax

Leopard sound

Head oriented towards the source of the sound

  ¾TB

-

83ax*

50ay*

  ½TB

-

86ax

100bx*

  ¼TB

-

100ax*

67by*

Elevated neck

  ¾TB

0ax

50ay

33ay*

  ½TB

0ax

100by*

100by*

  ¼TB

0ax

83by

33az

Elevated tail

  ¾TB

0ax

0ax*

0ax

  ½TB

0ax

28by*

14bxy

  ¼TB

0ax

33by*

17bz*

Vocalization – alarm snort

  ¾TB

0ax

0ax

0ax

  ½TB

0ax

14by*

0ax

  ¼TB

0ax

33cy*

0ax

  1. ¾TB, ½TB, ¼TB – horse groups with 75%, 50% and 25% Thoroughbred ancestry within the parental and grandparental generations, respectively
  2. (-) lack of stimulus at the prestimulus period
  3. Percentages marked with different letters significantly differ (according to Parker’s test) at p < 0.05: a, b, c - in columns (between different horse pedigree groups exposed to the same predator sound); x, y, z - in rows (between the same horse pedigree group at different test periods); *between the same horse pedigree group exposed to different predator sounds in analogical period of the test