Can sheep roll across cattle grids?
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Hungry sheep on the Yorkshire moors have taught themselves to roll 8ft (3m) across hoof-proof metal cattle grids – and raid villagers’ valley gardens. The crafty animals have also perfected the skill of hurdling 5ft (1.5m) fences and squeezing through 8in (20cm) gaps.
How does a cattle grid work?
Electric cattle grids use electricity to deter animals from crossing the fence line. There are different designs. One uses high-tensile wire run across the roadway, about 3 to 4 inches (8 to 10 cm) off the ground, attached to a power source on one side. The primary advantage is cost and ease of installation.
Why do sheep roll over?

The sheep rolls over to give it a rub just like a dog but once on their back they can’t get back onto its feet again. So they are stuck.
Can sheep roll?
Why does it happen? During lambing season, pregnant sheep are more vulnerable to falling over. They also tend to have a full fleece which can become so heavy that they tip over and roll on to their back. Sheep with their bodies in this position can find it difficult to get up.
How deep is a cattle grid?
250mm
What is the depth of a cattle or deer grid? The depth of a grid should be a minimum of 250mm and not greater than 450mm. From the point of view of animal deterrance, there is no need for a pit to be deeper than 250mm. This is considered a preferred dimension in terms of animal welfare.

Do cattle gaps work?
Cattle Guards are not effective for all animals Even small hoofed animals such as sheep and goats will usually be able to trot right across without much effort. Here, a gate has been shown to be the most effective.
What does it mean if a sheep is on its back?
According to the Working Sheepdog Website , a sheep is at risk of getting stuck on its back if it is heavily pregnant, it has a heavy, possibly wet fleece or it’s simply too fat. But once stuck on its back, it’s vulnerable to attack from predators such as crows.