求翻译：淮北灰驴是安徽省的一个历史悠久、分布较广的优良小型驴种，随着农业机械化程度的提高，淮北灰驴饲养量呈现大幅下降，纯种淮北灰驴处濒危边缘。为了进一步发展安徽省养驴业，充分利用淮北灰驴这一品种资源，应加强选种选育，增加数量，同时不断改善其饲养管理条件，提高其生产性能，提高其肉用性能和繁殖性能，使之由役用逐步向肉役兼用或肉用方向发展。是什么意思？

The Huaibei gray donkey is the Anhui Province has a long history, the wider distribution of the fine small donkey, with the degree of mechanization in agriculture to improve the the Huaibei gray donkeys feeding a great fall, pure the Huaibei gray donkey at the Endangered edge. To further the develop

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The Huaibei ash donkey is a Anhui Province's history glorious, the distributed broad fine small donkey plants, along with the mechanization of agriculture degree enhancement, the Huaibei ash donkey raising quantity presents the large drop, the purebred Huaibei ash donkey place is in imminent danger

Huaibei Anhui Province, grey donkey is one with a long history and a wider distribution of fine small ass kind, as the improving level of agricultural mechanization, Huaibei grey donkey feeding and sharp decline in volume rendering, purebred Huaibei endangered edge gray donkey. In order to further d