Whole-tract dry matter and nitrogen digestibility of lactating dairy cows selected for phenotypic divergence in residual feed intake

Thornhill, J. B., Marett, L. C., Auldist, M. J., Greenwood, J. S., Pryce, J. E., Hayes, B. J. and Wales, W. J. (2014) Whole-tract dry matter and nitrogen digestibility of lactating dairy cows selected for phenotypic divergence in residual feed intake. Animal Production Science, 54 9: 1460-1464. doi:10.1071/AN14200


Author Thornhill, J. B.
Marett, L. C.
Auldist, M. J.
Greenwood, J. S.
Pryce, J. E.
Hayes, B. J.
Wales, W. J.
Title Whole-tract dry matter and nitrogen digestibility of lactating dairy cows selected for phenotypic divergence in residual feed intake
Journal name Animal Production Science   Check publisher's open access policy
ISSN 1836-5787
1836-0939
Publication date 2014-07-23
Sub-type Article (original research)
DOI 10.1071/AN14200
Open Access Status Not yet assessed
Volume 54
Issue 9
Start page 1460
End page 1464
Total pages 5
Place of publication Clayton, Australia
Publisher CSIRO Publishing
Language eng
Formatted abstract
The objective of this experiment was to compare the whole-tract digestibility of dry matter (DM) and nitrogen (N) in Holstein-Friesian dairy cows selected for divergent feed conversion efficiency. The experiment used 16 primiparous Holstein-Friesian dairy cows selected based on their residual feed intake (RFI) measured as growing calves. The cows were housed in individual metabolism stalls and fed lucerne cubes ad libitum plus 6 kg DM per day of crushed wheat grain. Feed intake, milk yield, faecal and urine output were measured for 5 days. Rumen fluid was collected per os from each cow on one occasion. Milk production parameters and intakes of DM, organic matter, neutral detergent fibre, acid detergent fibre and N did not differ between RFI groups. Apparent whole-tract DM digestibility and N digestibility did not differ between RFI treatment groups. Rumen metabolites were also unaffected by RFI. In conclusion, divergence in RFI as calves was not associated with differences in whole-tract DM or N digestibility in lactating cows. Therefore, emphasis on selection for phenotypic divergence in RFI may not contribute to improved utilisation of consumed nutrients in Australian Holstein-Friesian dairy cows.
Keyword Digestion
Energy partioning
Feed conversion efficiency
Holstein-Friesian
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
 
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