Efficiency of rumen microbial protein synthesis in cattle grazing tropical pastures as estimated by a novel technique
| Autor: | Maree K. Bowen, Dennis P. Poppi, Stuart R. McLennan |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Bothriochloa bladhii
geography geography.geographical_feature_category biology 0402 animal and dairy science food and beverages 04 agricultural and veterinary sciences Lolium multiflorum biology.organism_classification 040201 dairy & animal science Pasture Rumen Agronomy Grazing Dry season Heteropogon contortus 040103 agronomy & agriculture Environmental management system 0401 agriculture forestry and fisheries Animal Science and Zoology Food Science |
| Zdroj: | Animal Production Science. 57:1702 |
| ISSN: | 1836-0939 |
| DOI: | 10.1071/an15535 |
| Popis: | The efficiency of microbial protein synthesis (EMPS) in cattle grazing a range of tropical pasture types was examined using a new method of intra-jugular infusion of chromium–EDTA to estimate urinary excretion of purine derivatives. Seven pasture types were studied in south-eastern Queensland, Australia, over a 13-month period. These included native tropical grass (C4) pasture (major species Heteropogon contortus and Bothriochloa bladhii) studied in the early wet, the wet–dry transition and the dry season; introduced tropical grass (C4) pasture (Bothriochloa insculpta) in the mid-wet season; two introduced tropical legume species (C3; Lablab purpureus and Clitoria ternatea); and the temperate-grass (C3) pasture, ryegrass (Lolium multiflorum). There was a large range in EMPS across pasture types, with a range of 26–209 g microbial crude protein per kilogram digestible organic matter intake (DOMI). Estimated rumen-degradable protein (RDP) supply (42–525 g/kg DOMI) was the major factor associated with EMPS across the range of pasture types studied. EMPS in steers grazing all tropical grass pastures was low ( |
| Databáze: | OpenAIRE |
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