A roof-ridge skylight is very important in livestock buildings as it provides ventilation and lighting. It is assumed that the three main factors affecting milk yield of cows are: sufficient lighting, correct ventilation and lack of stress. The skylights we use are made of polycarbonate and are framed in aluminium. In the Polish climatic conditions, we usually use open skylights on pitched roof structures. On the client's request, we can deliver a hinged skylight (operated manually or electrically) or a fixed skylight in the shape of a chimney.