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Table 3 Comparison of fertility results using different packages and thawing temperatures. P values and chi-squared (25-days NR- and lambing rates) for the comparison of fertility results using different packages and thawing temperatures after vaginal insemination of 719 ewes, aged between six months and six-and-a-half years, with 200 × 106 frozen-thawed spermatozoa collected from 7 mature rams.

From: Comparison of fertility results after vaginal insemination using different thawing procedures and packages for frozen ram semen

  

Chi-Square

P

Comparison between minitubes and mini straws

Degrees of freedom

NR

Lambing

NR

Lambing

T 70 – S 50

1

1.2

0.3

0.3

0.6

T 70 – S 35

1

0.1

0.5

0.8

0.5

S 50 – S 35

1

0.7

1.6

0.4

0.2

  1. T70 = Minitubes thawed at 70°C for 8 sec
  2. S50 = Mini straws thawed at 50°C for 9 sec
  3. S35 = Mini straws thawed at 35°C for 12 sec
  4. NR = 25-days non-return