Proxies to adjust methane production rate of beef cattle when the quantity of feed consumed is unknown (2024)

Herd, R. M., Velazco, J. I., Arthur, P. F., & Hegarty, R. (2016). Proxies to adjust methane production rate of beef cattle when the quantity of feed consumed is unknown. Animal Production Science, 56(3), 231-237. https://doi.org/10.1071/an15477

Herd, Robert M ; Velazco, J I ; Arthur, P F et al. / Proxies to adjust methane production rate of beef cattle when the quantity of feed consumed is unknown. In: Animal Production Science. 2016 ; Vol. 56, No. 3. pp. 231-237.

@article{9c07351077a5414b8233da8a521aea83,

title = "Proxies to adjust methane production rate of beef cattle when the quantity of feed consumed is unknown",

abstract = "The aim of the present experiment was to evaluate the utility of carbon dioxide production rate (CPR; g CO₂/ day) and animal weight (WT) data as proxies for feed intake to adjust methane production rate (MPR; g CH₄/day) in situations where dry-matter intake (DMI) is not known. This experiment measured individual-animal DMI, MPR and CPR in the feedlot, and then again on restricted quantities of grain and roughage diets in open-circuit respiration chambers. Of the 59 cattle tested in the feedlot, 41 had MPR and CPR recorded, and 59 and 57 had test results on the restricted grain and roughage rations. Methane production relative to DMI by individual animals was calculated as CH₄ yield (MY; MPR/ DMI) and as residual CH₄ production (RMPDMI; calculated as MPR less predicted MPR based on DMI). A second form of RMP: RMPCO₂ , was calculated by regressing MPR against CPR to determine whether animals were producing more or less CH₄ than predicted for their CPR. Carbon dioxide production rate was positively associated with DMI in all three test phases (R2 = 0.25, 0.45 and 0.47; all P < 0.001). The associations for MY with MPR : CPR were moderate and positive, as follows: R2 = 0.49 in the feedlot test; R2 = 0.37 in the restricted-grain test; and R2 = 0.59 in the restricted-roughage test, and with RMPCO₂ , values of R2 were 0.57, 0.34 and 0.59 in the three test phases (all P < 0.001). The R2 for RMPDMI with MPR : CPR in all three tests were 0.50, 0.79 and 0.69, and with RMPCO₂ , values of R2 were 0.68, 0.79 and 0.68 (all P < 0.001). The high R2 for MY with MPR : CPR and RMPCO2 and even higher R2 for RMPDMI with MPR : CPR and RMPCO₂ in all three test phases showed that CPR can be used to adjust MPR data for DMI when DMI is not recorded. In the feedlot test, where animal WT data were recorded over 70 days, MPR adjusted for WT and WT gain had R2 with MY and RMPDMI of 0.60 and 0.83, respectively (P < 0.001), offering the possibility that animal WT data determined over an extended time period could also be used as a proxy for DMI in adjustment of MPR.",

keywords = "Animal Nutrition",

author = "Herd, {Robert M} and Velazco, {J I} and Arthur, {P F} and Roger Hegarty",

year = "2016",

doi = "10.1071/an15477",

language = "English",

volume = "56",

pages = "231--237",

journal = "Animal Production Science",

issn = "1836-0939",

publisher = "CSIRO Publishing",

number = "3",

}

Herd, RM, Velazco, JI, Arthur, PF & Hegarty, R 2016, 'Proxies to adjust methane production rate of beef cattle when the quantity of feed consumed is unknown', Animal Production Science, vol. 56, no. 3, pp. 231-237. https://doi.org/10.1071/an15477

Proxies to adjust methane production rate of beef cattle when the quantity of feed consumed is unknown. / Herd, Robert M; Velazco, J I; Arthur, P F et al.
In: Animal Production Science, Vol. 56, No. 3, 2016, p. 231-237.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Proxies to adjust methane production rate of beef cattle when the quantity of feed consumed is unknown

AU - Herd, Robert M

AU - Velazco, J I

AU - Arthur, P F

AU - Hegarty, Roger

PY - 2016

Y1 - 2016

N2 - The aim of the present experiment was to evaluate the utility of carbon dioxide production rate (CPR; g CO₂/ day) and animal weight (WT) data as proxies for feed intake to adjust methane production rate (MPR; g CH₄/day) in situations where dry-matter intake (DMI) is not known. This experiment measured individual-animal DMI, MPR and CPR in the feedlot, and then again on restricted quantities of grain and roughage diets in open-circuit respiration chambers. Of the 59 cattle tested in the feedlot, 41 had MPR and CPR recorded, and 59 and 57 had test results on the restricted grain and roughage rations. Methane production relative to DMI by individual animals was calculated as CH₄ yield (MY; MPR/ DMI) and as residual CH₄ production (RMPDMI; calculated as MPR less predicted MPR based on DMI). A second form of RMP: RMPCO₂ , was calculated by regressing MPR against CPR to determine whether animals were producing more or less CH₄ than predicted for their CPR. Carbon dioxide production rate was positively associated with DMI in all three test phases (R2 = 0.25, 0.45 and 0.47; all P < 0.001). The associations for MY with MPR : CPR were moderate and positive, as follows: R2 = 0.49 in the feedlot test; R2 = 0.37 in the restricted-grain test; and R2 = 0.59 in the restricted-roughage test, and with RMPCO₂ , values of R2 were 0.57, 0.34 and 0.59 in the three test phases (all P < 0.001). The R2 for RMPDMI with MPR : CPR in all three tests were 0.50, 0.79 and 0.69, and with RMPCO₂ , values of R2 were 0.68, 0.79 and 0.68 (all P < 0.001). The high R2 for MY with MPR : CPR and RMPCO2 and even higher R2 for RMPDMI with MPR : CPR and RMPCO₂ in all three test phases showed that CPR can be used to adjust MPR data for DMI when DMI is not recorded. In the feedlot test, where animal WT data were recorded over 70 days, MPR adjusted for WT and WT gain had R2 with MY and RMPDMI of 0.60 and 0.83, respectively (P < 0.001), offering the possibility that animal WT data determined over an extended time period could also be used as a proxy for DMI in adjustment of MPR.

AB - The aim of the present experiment was to evaluate the utility of carbon dioxide production rate (CPR; g CO₂/ day) and animal weight (WT) data as proxies for feed intake to adjust methane production rate (MPR; g CH₄/day) in situations where dry-matter intake (DMI) is not known. This experiment measured individual-animal DMI, MPR and CPR in the feedlot, and then again on restricted quantities of grain and roughage diets in open-circuit respiration chambers. Of the 59 cattle tested in the feedlot, 41 had MPR and CPR recorded, and 59 and 57 had test results on the restricted grain and roughage rations. Methane production relative to DMI by individual animals was calculated as CH₄ yield (MY; MPR/ DMI) and as residual CH₄ production (RMPDMI; calculated as MPR less predicted MPR based on DMI). A second form of RMP: RMPCO₂ , was calculated by regressing MPR against CPR to determine whether animals were producing more or less CH₄ than predicted for their CPR. Carbon dioxide production rate was positively associated with DMI in all three test phases (R2 = 0.25, 0.45 and 0.47; all P < 0.001). The associations for MY with MPR : CPR were moderate and positive, as follows: R2 = 0.49 in the feedlot test; R2 = 0.37 in the restricted-grain test; and R2 = 0.59 in the restricted-roughage test, and with RMPCO₂ , values of R2 were 0.57, 0.34 and 0.59 in the three test phases (all P < 0.001). The R2 for RMPDMI with MPR : CPR in all three tests were 0.50, 0.79 and 0.69, and with RMPCO₂ , values of R2 were 0.68, 0.79 and 0.68 (all P < 0.001). The high R2 for MY with MPR : CPR and RMPCO2 and even higher R2 for RMPDMI with MPR : CPR and RMPCO₂ in all three test phases showed that CPR can be used to adjust MPR data for DMI when DMI is not recorded. In the feedlot test, where animal WT data were recorded over 70 days, MPR adjusted for WT and WT gain had R2 with MY and RMPDMI of 0.60 and 0.83, respectively (P < 0.001), offering the possibility that animal WT data determined over an extended time period could also be used as a proxy for DMI in adjustment of MPR.

KW - Animal Nutrition

U2 - 10.1071/an15477

DO - 10.1071/an15477

M3 - Article

SN - 1836-0939

VL - 56

SP - 231

EP - 237

JO - Animal Production Science

JF - Animal Production Science

IS - 3

ER -

Herd RM, Velazco JI, Arthur PF, Hegarty R. Proxies to adjust methane production rate of beef cattle when the quantity of feed consumed is unknown. Animal Production Science. 2016;56(3):231-237. doi: 10.1071/an15477