Why do sheep get horny in winter? Because the light is baaad, says study

Study may reveal why melatonin affects breeding, horn growth and coat thickness - and allow farmers to change the timing of lambing season

The mystery of why sheep get horny in the winter might have been solved, according to new research.

Scientists say they have uncovered the key to the mechanism by which changes in the length of the day prompt certain animals to begin breeding, trigger the growth of horns and even change the thickness of their coat.