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Table 3 Bt status of seeds in samples from fields of Bt cotton

From: Bt cotton seed purity in Burkina Faso: status and lessons learnt

 

Cry1Ac

Cry2Ab

Cry1Ac + Cry2Ab

Number of sample

349

349

349

Share of samples with presencea of the concerned Cry gene /%

95.7

94.3

92.6

Presence rateb of Cry1Ac /%

 Mean

88.1

 

88.8

 Std. deviation

11.9

 

11.2

Presence rateb of Cry2Ab /%

 Mean

 

86.5

86.6

 Std. deviation

 

12.2

12.1

  1. a Presence is claimed when observed on no less than 6 seeds out of 11 of each sample
  2. b Rate of presence in samples where the presence was observed according to the retained criterion, calculated from the number of seeds with Bt gene detected out of eleven