Kamalanathan Stephanie, Houlahan Kerry, Miglior Filippo, Chud Tatiane C S, Seymour Dave J, Hailemariam Dagnachew, Plastow Graham, de Oliveira Hinayah R, Baes Christine F, Schenkel Flavio S
Centre for Genetic Improvement of Livestock, Department of Animal Biosciences, University of Guelph, Guelph, ON N1G 2W1, Canada.
Lactanet Canada, Guelph, ON N1K 1E5, Canada.
Animals (Basel). 2023 Apr 11;13(8):1308. doi: 10.3390/ani13081308.
Genetic selection can be a feasible method to help mitigate enteric methane emissions from dairy cattle, as methane emission-related traits are heritable and genetic gains are persistent and cumulative over time. The objective of this study was to estimate heritability of methane emission phenotypes and the genetic and phenotypic correlations between them in Holstein cattle. We used 1765 individual records of methane emission obtained from 330 Holstein cattle from two Canadian herds. Methane emissions were measured using the GreenFeed system, and three methane traits were analyzed: the amount of daily methane produced (g/d), methane yield (g methane/kg dry matter intake), and methane intensity (g methane/kg milk). Genetic parameters were estimated using univariate and bivariate repeatability animal models. Heritability estimates (±SE) of 0.16 (±0.10), 0.27 (±0.12), and 0.21 (±0.14) were obtained for daily methane production, methane yield, and methane intensity, respectively. A high genetic correlation (rg = 0.94 ± 0.23) between daily methane production and methane intensity indicates that selecting for daily methane production would result in lower methane per unit of milk produced. This study provides preliminary estimates of genetic parameters for methane emission traits, suggesting that there is potential to mitigate methane emission in Holstein cattle through genetic selection.
基因选择可能是一种有助于减少奶牛肠道甲烷排放的可行方法，因为与甲烷排放相关的性状具有遗传性，且随着时间推移，遗传进展具有持续性和累积性。本研究的目的是估计荷斯坦奶牛甲烷排放表型的遗传力以及它们之间的遗传和表型相关性。我们使用了来自加拿大两个牛群的330头荷斯坦奶牛的1765条甲烷排放个体记录。使用GreenFeed系统测量甲烷排放，并分析了三个甲烷性状：每日产生的甲烷量（克/天）、甲烷产量（克甲烷/千克干物质摄入量）和甲烷强度（克甲烷/千克牛奶）。使用单变量和双变量重复性动物模型估计遗传参数。每日甲烷产量、甲烷产量和甲烷强度的遗传力估计值（±标准误）分别为0.16（±0.10）、0.27（±0.12）和0.21（±0.14）。每日甲烷产量与甲烷强度之间存在较高的遗传相关性（rg = 0.94 ± 0.23），这表明选择每日甲烷产量将导致每生产单位牛奶的甲烷排放量降低。本研究提供了甲烷排放性状遗传参数的初步估计，表明通过基因选择有潜力减少荷斯坦奶牛的甲烷排放。
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