Development of Climate Master Cattle: A New Climate Resilient High-Value Wagyu Composite Beef Breed for Use in Temperate Environments

热应激是引起北美普通牛肉牛生产中死亡和产量损失的一个新兴原因。尽管极端热浪发生在加拿大牧场，有很少的热应激研究在这些设置进行。随着加拿大西部的热浪和夏季气温预计将急剧上升，越来越需要开发和选择新的耐热牛品种，用于在温带环境中生产牛肉。此外，由于极地涡旋活动的预期增加，牛必须仍然能够同时执行/应对严重的寒冷应激;否则该行业将面临冬季饲养需求增加导致的生产成本增加，这是加拿大奶牛/小牛部门最大的财政投入成本。为了应对这一挑战，我们将开发一种新的复合牛肉品种，相信它能够应对极端气候，同时提供前所未有的动物性能，上级胴体产量/质量和优化的牛肉营养属性。我们将联合收割机完全独特的牛品种与新的和自然发生的基因组突变独立出现在非常不同的全球地理位置。我们将开发的复合牛肉品种，暂称为气候大师，将为加拿大和全球的现代美食牛肉消费者提供豪华的牛肉食用体验，同时提高养牛业的弹性和国家肉牛群的可持续性，面对前所未有的无情气候变化。

Heat stress is an emerging cause of mortality and production loss in Bos taurus beef cattle production in North America. Despite extreme heat waves that occur in Canadian rangelands, there is very little heat stress research conducted in these settings. As heat waves and summer temperatures are projected to increase dramatically in Western Canada, there is a growing need to develop and select new heat-tolerant breeds of cattle for beef production in temperate environments. Additionally, due to anticipated increases in polar vortex activity, cattle must still be capable of performing/coping with severe cold stress simultaneously; or the industry will face increased production costs resulting from rising winter-feeding requirements, the single largest financial input cost to the cow/calf sector in Canada. To meet this challenge, we will develop a new composite beef breed believed capable of dealing with climatic extremes, while delivering unprecedented animal performance, superior carcass yield/quality and optimized beef nutritional attributes. We will combine totally unique Bos taurus breeds with novel and naturally occurring genomic mutations arising independently in very distinct global geographical locations. The composite beef breed we will develop, tentatively called the Climate Master, will provide the marketplace with a luxury beef eating experience for the modern gourmet beef consumer both in Canada and globally, while improving cattle industry resilience and sustainability of the national beef herd, in the face of unprecedented and unrelenting climate change.