You have the following data: Daily milk yield records of close relatives of a bull used to sire F1s: 24.4, 19.8, 23.0, 22.6, 20.2 kg, Daily milk yield records for cows: 18.1, 20.4, 17.5, 16.2, 25.2, 14.2 kg, Daily milk yield records for F1s: 31.0, 24.6, 25.4, 32.7, 26.3 kg. Calculate the heterosis (hybrid vigour) for this trait

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