Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, 41635-1314, Iran.
Sci Rep. 2022 Jul 19;12(1):12352. doi: 10.1038/s41598-022-16778-z.
The present study aimed to perform a meta-analysis using the three-level model to integrate published estimates of genetic parameters for methane emission traits [methane yield (METY), methane intensity (METINT), and methane production (METP)] in dairy cows. Overall, 40 heritability estimates and 32 genetic correlations from 17 papers published between 2015 and 2021 were used in this study. The heritability estimates for METY, METINT, and METP were 0.244, 0.180, and 0.211, respectively. The genetic correlation estimates between METY and METINT with corrected milk yield for fat, protein, and or energy (CMY) were negative (- 0.433 and - 0.262, respectively). Also, genetic correlation estimates between METINT with milk fat and protein percentages were 0.254 and 0.334, respectively. Although the genetic correlation estimate of METP with daily milk yield was 0.172, its genetic correlation with CMY was 0.446. All genetic correlation estimates between METP with milk fat and protein yield or percentage ranged from 0.005 (between METP-milk protein yield) to 0.185 (between METP-milk protein percentage). The current meta-analysis confirmed the presence of additive genetic variation for methane emission traits in dairy cows that could be exploited in genetic selection plans.
本研究旨在使用三级模型进行荟萃分析，整合已发表的奶牛甲烷排放性状（甲烷产量[METY]、甲烷强度[METINT]和甲烷生产[METP]）遗传参数的估计值。本研究共使用了 2015 年至 2021 年期间发表的 17 篇论文中的 40 个遗传力估计值和 32 个遗传相关系数。METY、METINT 和 METP 的遗传力估计值分别为 0.244、0.180 和 0.211。METY 和 METINT 与校正乳脂、蛋白和（或）能量产量（CMY）的遗传相关系数估计值为负值（分别为-0.433 和-0.262）。此外，METINT 与乳脂和蛋白百分率的遗传相关系数估计值分别为 0.254 和 0.334。虽然 METP 与日产量的遗传相关系数估计值为 0.172，但它与 CMY 的遗传相关系数为 0.446。METP 与乳脂和蛋白产量或百分率的所有遗传相关系数估计值均在 0.005（METP-乳蛋白产量之间）到 0.185（METP-乳蛋白百分率之间）之间。本次荟萃分析证实了奶牛甲烷排放性状存在加性遗传变异，可以在遗传选择计划中加以利用。
