Farmers in Britain have developed milk that they say is chemically proven to promote a full and restful night's sleep.

The milk is now being marketed to people who rely on other means of falling asleep, such as sleeping pills. It contains higher levels of melatonin, which was found in recent Finnish studies to promote sleep.

Meanwhile in New Zealand, scientists Garry Waghorn and Michael Tavendale from Palmerston North AgResearch have discovered that feeding cows with a legume that contains tannin can reduce methane emissions by 16%.

Cows produce methane during their digestive process, but the noxious gas generates over 50% of New Zealand's total greenhouse gas emissions.