What impact did the severe winters of 1865 and 1866 have on the cattle kingdom have?

It was actually the Great Winter of 1886-87 that affected the cattle kingdom. Thousands and thousands of cattle died during this Great Winter due to starvation. Many ranchers failed to put up winter feed for their cattle, and they also did not have adequate knowledge of stocking rates or carrying capacity for the grasslands that they had their cattle grazing on, so instead of having lots of pasture for winter, there was no pasture for winter because the grasslands had been overgrazed so bad. Ranchers suffered greatly in the huge losses of their cattle herds, and the cattle suffered from lack of feed.