Cercetătorii de la Facultatea de Medicină Veterinară din Viena, Austria, au realizat un studiu, ale cărui rezultate le-au prezentat marţi, în urma căruia au concluzionat că găinile stresate fac ouă mai mici. Oamenii de ştiinţă au luat mai multe înaripate şi pe unele dintre ele le-au injectat cu corticosteron, pentru a le provoca stres în mod artificial.
După o lună de „tratament”, acestea au făcut ouă mai mici, spre deosebire de găinile care nu au fost influenţate în nici un fel. Ulterior, după ce ouăle au fost clocite, din ele au ieşit pui mai firavii decât în mod normal.
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