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The aim of the study was to evaluate the effects of lycopene and vitamin E on cloacal temperature (CT), thyroid hormones and performance indices in laying hens (Gallus domesticus) during the hot-dry season. The dry-bulb temperature and temperature-humidity index in the pen and CT were measured in all hens twice weekly and thyroid hormones for five consecutive weeks. Ovarian and follicular activities were assessed at the end of the study after slaughter. The CT values in control hens at 0900 h, 1200 h and 1500 h (41.20 ± 0.07 °C, 41.84 ± 1
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