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动物委员会特邀综述:基于基因组学的牛应对气候变化的改良

Animal board invited review: Genomic-based improvement of cattle in response to climate change.

作者信息

Strandén I, Kantanen J, Lidauer M H, Mehtiö T, Negussie E

机构信息

Natural Resources Institute Finland (Luke), 31600 Jokioinen, Finland.

Natural Resources Institute Finland (Luke), 31600 Jokioinen, Finland.

出版信息

Animal. 2022 Dec;16(12):100673. doi: 10.1016/j.animal.2022.100673. Epub 2022 Oct 31.

Abstract

Climate change brings challenges to cattle production, such as the need to adapt to new climates and pressure to reduce greenhouse emissions (GHG). In general, the improvement of traits in current breeding goals is favourably correlated with the reduction of GHG. Current breeding goals and tools for increasing cattle production efficiency have reduced GHG. The same amount of production can be achieved by a much smaller number of animals. Genomic selection (GS) may offer a cost-effective way of using an efficient breeding approach, even in low- and middle-income countries. As climate change increases the intensity of heatwaves, adaptation to heat stress leads to lower efficiency of production and, thus, is unfavourable to the goal of reducing GHG. Furthermore, there is evidence that heat stress during cow pregnancy can have many generation-long lowering effects on milk production. Both adaptation and reduction of GHG are among the difficult-to-measure traits for which GS is more efficient and suitable than the traditional non-genomic breeding evaluation approach. Nevertheless, the commonly used within-breed selection may be insufficient to meet the new challenges; thus, cross-breeding based on selecting highly efficient and highly adaptive breeds may be needed. Genomic introgression offers an efficient approach for cross-breeding that is expected to provide high genetic progress with a low rate of inbreeding. However, well-adapted breeds may have a small number of animals, which is a source of concern from a genetic biodiversity point of view. Furthermore, low animal numbers also limit the efficiency of genomic introgression. Sustainable cattle production in countries that have already intensified production is likely to emphasise better health, reproduction, feed efficiency, heat stress and other adaptation traits instead of higher production. This may require the application of innovative technologies for phenotyping and further use of new big data techniques to extract information for breeding.

摘要

气候变化给养牛业带来了挑战,比如需要适应新的气候条件以及减少温室气体排放(GHG)的压力。总体而言,当前育种目标中性状的改良与温室气体排放的减少呈正相关。当前提高养牛生产效率的育种目标和工具已经降低了温室气体排放。用少得多的动物数量就能实现同样的产量。基因组选择(GS)可能提供一种经济高效的方式来采用高效育种方法,即使在低收入和中等收入国家也是如此。随着气候变化加剧热浪强度,适应热应激会导致生产效率降低,因此不利于减少温室气体排放的目标。此外,有证据表明母牛怀孕期的热应激会对产奶量产生多代的降低影响。适应和减少温室气体排放都是难以测量的性状,对于这些性状,基因组选择比传统的非基因组育种评估方法更高效、更适用。然而,常用的品种内选择可能不足以应对新挑战;因此,可能需要基于选择高效且高度适应性品种的杂交育种。基因组渐渗为杂交育种提供了一种高效方法,有望在低近亲繁殖率的情况下实现高遗传进展。然而,适应性良好的品种可能动物数量较少,从遗传生物多样性的角度来看这是一个令人担忧的问题。此外,动物数量少也限制了基因组渐渗的效率。在已经强化生产的国家,可持续的养牛生产可能会更强调更好的健康、繁殖、饲料效率、热应激及其他适应性状,而非更高的产量。这可能需要应用创新的表型分析技术,并进一步利用新的大数据技术来提取育种信息。

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