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Table 1 Differences between variables on mare fertility after AI with fresh extended versus cooled transported semen

From: A retrospective cohort study on fertility in the Norwegian Coldblooded trotter after artificial insemination with cooled, shipped versus fresh extended semen

Semen used

No. of mares

1st cycle pregnancy rate

Seasonal pregnancy rate

Pregnancy loss rate

Foaling rate

Fresh

Cooled

Fresh

Cooled

Fresh

Cooled

Fresh

Cooled

Fresh

Cooled

Mare age

 Younger (2–10)

625

271

57.4a

46.7b

87.0c

70.9d

4.6

4.1

82.4e

66.8f

 Mature (11–15)

416

193

55.5a

38.3b

84.1c

64.8d

5.5

4.2

78.6e

60.6f

 Older (16–24)

216

91

47.7a

37.4a

77.3c

59.3d

5.6

3.3

71.8e

56.0f

Stud

 A

763

389

51.4a

44.0b

83.6c

69.4d

5.9

3.3

77.7e

66.1f

 B

158

54

58.2a

20.4b

87.3c

51.9d

3.2

3.7

84.2e

48.2f

 C

131

46

58.0a

50.0a

87.0c

76.1c

3.0

6.5

84.0e

69.6e

 D

205

58

64.9a

44.8b

83.4c

60.3d

4.9

6.9

78.5e

53.5f

 E

0

8

37.5

37.5

0.0

37.5

Year

 2006

137

75

54.0a

44.0a

81.8c

65.3d

4.4

5.3

77.4e

60.0f

 2007

243

81

47.3a

46.9a

84.0c

69.1d

4.1

2.5

79.8e

66.7f

 2008

368

103

57.9a

28.2b

84.0c

57.3d

4.6

1.6

79.4e

55.3f

 2009

297

158

58.9a

51.9a

86.5c

76.6d

4.4

7.0

82.2e

69.6f

 2010

212

138

54.7a

37.7b

84.4c

62.3d

8.5

2.2

75.9e

60.1f

Overall

1257

555

55.1a

42.2b

84.4c

66.9d

5.1

4.0

79.3e

62.9f

  1. All numbers are given in %. Values between fresh and cooled semen on fertility parameters within a row with different superscripts vary significantly