Are results of Crib Opening Test connected with efficacy of training horses in a round-pen?

It took the TB horses significantly longer to open the crib than it took the AA horses (306 s vs 191 s, respectively). Numerous statistically significant correlations were found between the results of Crib Opening Test and the results of Saddling Test performed by the TB fillies and AA horses: positive with HR, and negative with some HRV parameters. Correlations between the results of Crib Opening Test and Mounting Test were negative with HR and positive with beat-to-beat time (RR) for the PA and AA fillies. It seems that the horses which quickly succeed in Crib Opening Test are calm during the first phase of the initial training until saddling, but they do not willingly accept mounting. However, the relationship between the time of opening the crib and response to the training should be analysed separately in particular horse breeds and sexes.