Effects of insoluble grit on the productive performance of ten white leghorn strains1

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Abstract
1. White Leghorn chicks of 10 strains were reared, on wire, to 140 d with or without insoluble grit and then were housed in laying cages where grit and no grit treatments were superimposed on the rearing treatments. 2. During rearing the feeding of grit had no effect on the body weight or food conversion ratio but there were small treatment effects on mortality between three commercial strains. 3. During laying the grit treatments had no direct effects on food consumption, mortality, final body weights, age at first egg, egg production, Haugh units or total blood spots. 4. Egg weight and specific gravity at 450 d were affected by grit treatment but the differences were small.