Supplementation of cattle fed tropical grasses with microalgae increases microbial protein production and average daily gain

Costa, D. F. A., Quigley, S. P., Isherwood, P., McLennan, S. R. and Poppi, D. P. (2016) Supplementation of cattle fed tropical grasses with microalgae increases microbial protein production and average daily gain. Journal of Animal Science, 94 5: 2047-2058. doi:10.2527/jas.2016-0292


Author Costa, D. F. A.
Quigley, S. P.
Isherwood, P.
McLennan, S. R.
Poppi, D. P.
Title Supplementation of cattle fed tropical grasses with microalgae increases microbial protein production and average daily gain
Journal name Journal of Animal Science   Check publisher's open access policy
ISSN 0021-8812
1525-3163
Publication date 2016-05
Sub-type Article (original research)
DOI 10.2527/jas.2016-0292
Open Access Status Not yet assessed
Volume 94
Issue 5
Start page 2047
End page 2058
Total pages 12
Place of publication Champaign, IL, United States
Publisher American Society of Animal Science
Collection year 2017
Language eng
Formatted abstract
A series of 3 experiments were conducted to evaluate the use of microalgae as supplements for ruminants consuming low-CP tropical grasses. In Exp. 1, the chemical composition and in vitro protein degradability of 9 algae species and 4 protein supplements were determined. In Exp. 2, rumen function and microbial protein (MCP) production were determined in Bos indicus steers fed speargrass hay alone or supplemented with Spirulina platensis, Chlorella pyrenoidosa, Dunaliella salina, or cottonseed meal (CSM). In Exp. 3, DMI and ADG were determined in B. indicus steers fed speargrass hay alone or supplemented with increasing amounts of NPN (urea combined with ammonia sulfate), CSM, or S. platensis. In Exp. 1, the CP content of S. platensis and C. pyrenoidosa (675 and 580 g/kg DM) was highest among the algae species and higher than the other protein supplements evaluated, and Schizochytrium sp. had the highest crude lipid (CL) content (198 g/kg DM). In Exp. 2, S. platensis supplementation increased speargrass hay intake, the efficiency of MCP production, the fractional outflow rate of digesta from the rumen, the concentration of NH3N, and the molar proportion of branched-chain fatty acids in the rumen fluid of steers above all other treatments. Dunaliella salina acceptance by steers was low and this resulted in no significant difference to unsupplemented steers for all parameters measured for this algae supplement. In Exp. 3, ADG linearly increased with increasing supplementary N intake from both S. platensis and NPN, with no difference between the 2 supplements. In contrast, ADG quadratically increased with increasing supplementary N intake from CSM. It was concluded that S. platensis and C. pyrenoidosa may potentially be used as protein sources for cattle grazing low-CP pastures.
Keyword Algae
Cattle
Microbial protein
Rumen function
Tropical grasses
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Agriculture and Food Sciences
Queensland Alliance for Agriculture and Food Innovation
 
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