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- W3013257985 abstract "This study quantified methane (CH 4 ) and carbon dioxide (CO 2 ) production from beef heifers and cows classified for residual feed intake adjusted for off-test backfat thickness (RFI fat ) and reared in drylot during cold winter temperatures. Individual performance, daily feed intake, and RFI fat were obtained for 1068 crossbred and purebred yearling heifers (eight trials) as well as 176 crossbred mature cows (six trials) during the winters of 2015–2017 at two locations. A portion of these heifers (147 high RFI fat ; 167 low RFI fat ) and cows (69 high RFI fat ; 70 low RFI fat ) was monitored for enteric CH 4 and CO 2 emissions using the GreenFeed Emissions Monitoring (GEM) system (C-Lock Inc., Rapid City, SD, USA). Low RFI fat cattle consumed less feed [heifers, 7.80 vs. 8.48 kg dry matter (DM) d −1 ; cows, 11.64 vs. 13.16 kg DM d −1 ] and emitted less daily CH 4 (2.5% for heifers; 3.7% for cows) and CO 2 (1.4% for heifers; 3.4% for cows) compared with high RFI fat cattle. However, low RFI fat heifers and cows had higher CH 4 (6.2% for heifers; 9.9% for cows) and CO 2 yield (7.3% for heifers; 9.8% for cows) per kilogram DM intake compared with their high RFI fat pen mates. The GEM system performed at air temperatures between +20 and −30 °C. Feed intake of heifers and mature cows was differently affected by ambient temperature reduction between +20 and −15 °C and similarly increased their feed intake at temperatures below −15 °C. In conclusion, low RFI fat animals emit less daily enteric CH 4 and CO 2 , due mainly to lower feed consumption at equal body weight, gain, and fatness." @default.
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- W3013257985 date "2020-09-01" @default.
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- W3013257985 title "Methane and carbon dioxide emissions from yearling beef heifers and mature cows classified for residual feed intake under drylot conditions" @default.
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- W3013257985 doi "https://doi.org/10.1139/cjas-2019-0032" @default.
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