Light (II): How much and for how long?

Pig Progress’ resident expert on ‘Pig Management’, John Gadd, takes the subject of light 1 step further in this series of 4 and talks about the amount of light needed for sows – and for how long. [([002_432_rb-image-2816872.jpeg])]   In my last column I dealt with the effect of too much light from spring sunshine on outdoor and yarded sows, and then instruments for measuring light accurately which the farm staff can use. Where is sufficient light least understood? Pr