Velazco, J I; Herd, Robert M; Cottle, David; Hegarty, Roger

Author(s)

Velazco, J I

Herd, Robert M

Cottle, David

Hegarty, Roger

Publication Date

2017

Abstract

As daily methane production (DMP; g CH₄/day) is strongly correlated with dry matter intake (DMI), the breeding of cattle that require less feed to achieve a desired rate of average daily gain (ADG) by selection for a low residual feed intake (RFI) can be expected to reduce DMP and also emission intensity (EI; g CH₄/kg ADG). An experiment was conducted to compare DMP and EI of Angus cattle genetically divergent for RFI and 400-day weight (400dWT). In a 6-week grazing study, 64 yearling-age cattle (30 steers, 34 heifers) were grazed on temperate pastures, with heifers and steers grazing separate paddocks. Liveweight (LW) was monitored weekly and DMP of individual cattle was measured by a GreenFeed emission monitoring unit in each paddock. Thirty-nine of the possible 64 animals had emission data recorded for 15 or more days, and only data for these animals were analysed. For these cattle, regression against their mid-parent estimated breeding value (EBV) for post-weaning RFI (RFI-EBV) showed that a lower RFI-EBV was associated with higher LW at the start of experiment. Predicted dry matter intake (pDMI), predicted DMP (pDMP) and measured DMP (mDMP) were all negatively correlated with RFI-EBV (P < 0.05), whereas ADG, EI, predicted CH₄ yield (pMY; g CH₄/kg DMI) were not correlated with RFI-EBV (P > 0.1). Daily CH₄ production was positively correlated with animal LW and ADG (P < 0.05). The associations between ADG and its dependent traits EI and pMY and predicted feed conversion ratio (kg pDMI/kg ADG) were strongly negative (r = -0.82, -0.57 and -0.85, P < 0.001) implying that faster daily growth by cattle was accompanied by lower EI, MY and feed conversion ratio. These results show that cattle genetically divergent for RFI do not necessarily differ in ADG, EI or pMY on pasture and that, if heavier, cattle with lower RFI-EBV can actually have higher DMP while grazing moderate quality pastures.

Citation

Animal Production Science, 57(4), p. 627-635

ISSN

1836-5787

1836-0939

Link

https://hdl.handle.net/1959.11/20932

Publisher

CSIRO Publishing

Title

Daily methane emissions and emission intensity of grazing beef cattle genetically divergent for residual feed intake

Type of document

Journal Article

Entity Type

Publication

Author(s)	Velazco, J I Herd, Robert M Cottle, David Hegarty, Roger
Publication Date	2017
Abstract	As daily methane production (DMP; g CH₄/day) is strongly correlated with dry matter intake (DMI), the breeding of cattle that require less feed to achieve a desired rate of average daily gain (ADG) by selection for a low residual feed intake (RFI) can be expected to reduce DMP and also emission intensity (EI; g CH₄/kg ADG). An experiment was conducted to compare DMP and EI of Angus cattle genetically divergent for RFI and 400-day weight (400dWT). In a 6-week grazing study, 64 yearling-age cattle (30 steers, 34 heifers) were grazed on temperate pastures, with heifers and steers grazing separate paddocks. Liveweight (LW) was monitored weekly and DMP of individual cattle was measured by a GreenFeed emission monitoring unit in each paddock. Thirty-nine of the possible 64 animals had emission data recorded for 15 or more days, and only data for these animals were analysed. For these cattle, regression against their mid-parent estimated breeding value (EBV) for post-weaning RFI (RFI-EBV) showed that a lower RFI-EBV was associated with higher LW at the start of experiment. Predicted dry matter intake (pDMI), predicted DMP (pDMP) and measured DMP (mDMP) were all negatively correlated with RFI-EBV (P < 0.05), whereas ADG, EI, predicted CH₄ yield (pMY; g CH₄/kg DMI) were not correlated with RFI-EBV (P > 0.1). Daily CH₄ production was positively correlated with animal LW and ADG (P < 0.05). The associations between ADG and its dependent traits EI and pMY and predicted feed conversion ratio (kg pDMI/kg ADG) were strongly negative (r = -0.82, -0.57 and -0.85, P < 0.001) implying that faster daily growth by cattle was accompanied by lower EI, MY and feed conversion ratio. These results show that cattle genetically divergent for RFI do not necessarily differ in ADG, EI or pMY on pasture and that, if heavier, cattle with lower RFI-EBV can actually have higher DMP while grazing moderate quality pastures.
Citation	Animal Production Science, 57(4), p. 627-635
ISSN	1836-5787 1836-0939
Link	https://hdl.handle.net/1959.11/20932
Publisher	CSIRO Publishing
Title	Daily methane emissions and emission intensity of grazing beef cattle genetically divergent for residual feed intake
Type of document	Journal Article
Entity Type	Publication

Daily methane emissions and emission intensity of grazing beef cattle genetically divergent for residual feed intake

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