Intake, retention time in the rumen and microbial protein production of Bos indicus steers consuming grasses varying in crude protein content

Panjaitan, T., Quigley, S. P., McLennan, S. R., Swain, T. and Poppi, D. P. (2010) Intake, retention time in the rumen and microbial protein production of Bos indicus steers consuming grasses varying in crude protein content. Animal Production Science, 50 5-6: 444-448. doi:10.1071/AN09197


Author Panjaitan, T.
Quigley, S. P.
McLennan, S. R.
Swain, T.
Poppi, D. P.
Title Intake, retention time in the rumen and microbial protein production of Bos indicus steers consuming grasses varying in crude protein content
Journal name Animal Production Science   Check publisher's open access policy
ISSN 1836-0939
1836-5787
Publication date 2010-01-01
Sub-type Article (original research)
DOI 10.1071/AN09197
Volume 50
Issue 5-6
Start page 444
End page 448
Total pages 5
Place of publication Melbourne, Australia
Publisher CSIRO Publishing
Collection year 2011
Language eng
Abstract Feed intake, rumen function, microbial protein (MCP) production and the efficiency of MCP production were determined in steers fed four different forage hays varying markedly in crude protein content. Low quality tropical forage (speargrass and Mitchell grass) hays had lower crude protein content, higher neutral detergent fibre content and lower digestibility than a medium quality tropical forage (pangola grass) hay and a temperate forage (ryegrass) hay. Steers fed speargrass and Mitchell grass hays had lower MCP production (80 and 170 g MCP/day, respectively) and efficiency of MCP production [78 and 79 g MCP/kg digestible organic matter (DOM), respectively] than steers fed pangola grass (328 g MCP/day; 102 g MCP/kg DOM) and ryegrass (627 g MCP/day; 135 g MCP/kg DOM) hays, which was directly related to the supply of DOM and rumen degradable protein. Intake was greatest for ryegrass hay, followed by pangola grass, Mitchell grass and speargrass hays [17.6, 15.6, 10.1 and 5.5 g DM/kg W.day, respectively]. The retention time of DM in the rumen was 72.1, 47.7, 28.6 and 19.1 h for speargrass, Mitchell grass, pangola grass and ryegrass hays, respectively, with a similar trend apparent for the retention time of neutral detergent fibre, lignin, chromium-EDTA and ytterbium labelled digesta. The difference in the protein : energy ratio of absorbed substrates (measured as efficiency of MCP production) did not appear to account for all the differences in intake, nor did a purely physical mechanism.
Keyword Cattle
Digestibility
Food intake
Grass
Hay
Lignin
Microbial activity
Organic matter
Protein
Substrate
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Issue title: Animal Production in Australia - Livestock Production in a Changing Environment: Proceedings of the Australian Society of Animal Production Twenty-Eighth Biennial Conference

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Agriculture and Food Sciences
 
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Created: Wed, 08 Dec 2010, 23:57:51 EST by Stephen White on behalf of School of Animal Studies