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20世纪60年代以来,国际市场对牛肉需求日益增加,同时肉牛饲养管理所需劳力和建筑设备较少、成本低、获利大,肉牛业得到蓬勃发展,肉牛头数急剧增加,牛肉产量一直呈上升趋势[1]。加拿大肉牛产业发达,2008年世界牛肉人均占有量最多的国家分别是澳大利亚(250.8千克)、阿根廷(71.09千克)和美国(42.74千克),加拿大以人均41.25千克排名第四[2]。加拿大地广人稀,具有丰富的自然资源,为肉牛产业发展提供了得天
Since the 1960s, the demand for beef in the international market has been increasing. At the same time, the beef cattle raising and management requires less labor and construction equipment. The cost is low and the profit is great. The beef cattle industry has been booming. The number of beef cattle heads has sharply increased. Upward trend [1]. The beef cattle industry in Canada is developed. The world’s largest per capita amount of beef in 2008 was Australia (250.8 kg), Argentina (71.09 kg) and the United States (42.74 kg) respectively, with Canada ranking fourth in terms of per capita consumption of 41.25 kg [2]. Canada is sparsely populated and has abundant natural resources, providing a good day for the development of beef cattle industry