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The hatchability of the free standing (FS) eggs compared with that of the eggs positioned at θ = +13° (**, P < 0.01). A single experiment was conducted with four plots of around 25 eggs each, depending on the egg-angle and egg-turning. Values are means ± SEM of 5 experiments. The eggs positioned at θ = +13° were encased individually in a paper frame and tilted. Egg turning was performed manually every 12 h.
