8/2/2023 0 Comments Hp dmi tool 2018The relationship between CPR and DMI, and between CPR and BW was both positive and linear, for the heifers and also for the steers. Feed efficiency traits studied included feed conversion ratio ( FCR) and residual feed intake ( RFI). Other traits studied included carbon dioxide yield ( CY CPR/DMI) and intensity ( CI CPR/BW) and 5 forms of residual carbon dioxide production ( RCP), which is a measure of actual minus predicted CPR. The corresponding mean CPR was 5760 ± 644 g/d for heifers and 8939 ± 1212 g/d for steers. The data were from 119 Angus heifers over 15 d on a roughage diet and 326 Angus steers over 70 d on a feedlot diet. In both projects, the GreenFeed Emission Monitoring system, which provides multiple short-term breath measures of carbon dioxide production, was used as a tool to measure CPR. Angus cattle from 2 beef cattle projects on which carbon dioxide production rate ( CPR) was measured were used in this study to examine the relationships among BW, DMI, and carbon dioxide traits of beef cattle fed ad libitum on a roughage diet or a grain-based feedlot diet, and to evaluate potential proxies for DMI and feed efficiency.
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