Australorp and White Leghorn pullets were compared with their Fl, F2 and F3 crossbred offspring for a range of egg production variables. 2. The substantial hybrid vigour for efficiency of food conversion, hen‐housed egg production, hen‐day egg production and total egg mass of the F1 crossbred populations was lost in the F2 and F3 crossbred populations.
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Sheridan et al. (1977) studied this question.
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