Dry matter intake of dairy cows grazing irrigated perennial pastures estimated by three methods

dc.contributor	Williams, YJ
dc.contributor	Wales, WJ
dc.contributor	Doyle, PT
dc.contributor	Heard, JW
dc.date.accessioned	2012-01-25T12:39:40Z
dc.date.available	2012-01-25T12:39:40Z
dc.date.issued	2002
dc.identifier.citation	Proc. Aust. Soc. Anim. Prod. (2002) 24: 265-268
dc.identifier.uri	http://livestocklibrary.com.au/handle/1234/9245
dc.description.abstract	Dry matter intake of dairy cows grazing pasture based on perennial ryegrass (Lolium perenne L.) pasture at low or high herbage allowances was estimated from pre- and post-grazing pasture masses (PMM), using n-alkanes or by calculations based on cow performance and published estimates of energy requirements (PERM). Pasture intakes were lower (14.1 vs 17.1 kg DM/day) (p<0.05) at low compared to high herbage allowance when estimated using PMM, PERM and C31/C32 alkanes. When C33/C32 alkanes were used, there was no difference in intake between the 2 allowances (18.5 vs 18.6 kg DM/day). The estimates of intake using n-alkanes were higher (p<0.05) than for PMM or PERM. Sources of error and uncertainty with each method are discussed.
dc.publisher	ASAP
dc.source.uri	http://www.asap.asn.au/livestocklibrary/2002/williams1B.pdf
dc.subject	alkanes
dc.subject	pasture mass
dc.subject	pasture intake
dc.subject	herbage allowance
dc.title	Dry matter intake of dairy cows grazing irrigated perennial pastures estimated by three methods
dc.type	Research
dc.identifier.volume	24
dc.identifier.page	265-268