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https://hdl.handle.net/1959.11/28029
Title: | Recent advances to improve nitrogen efficiency of grain-finishing cattle in North American and Australian feedlots | Contributor(s): | Cowley, Frances (author) ; Jennings, Jenny (author); Cole, Andy (author); Beauchemin, Karen (author) | Publication Date: | 2019-09-16 | Open Access: | Yes | DOI: | 10.1071/AN19259 | Handle Link: | https://hdl.handle.net/1959.11/28029 | Abstract: | Formulating diets conservatively for minimum crude-protein (CP) requirements and overfeeding nitrogen (N) is commonplace in grain finishing rations in USA, Canada and Australia. Overfeeding N is considered to be a low-cost and low-risk (to cattle production and health) strategy and is becoming more commonplace in the US with the use of high-N ethanol by-products in finishing diets. However, loss of N from feedlot manure in the form of volatilised ammonia and nitrous oxide, and nitrate contamination of water are of significant environmental concern. Thus, there is a need to improve N-use efficiency of beef cattle production and reduce losses of N to the environment. The most effective approach is to lower N intake of animals through precision feeding, and the application of the metabolisable protein system, including its recent updates to estimation of N supply and recycling. Precision feeding of protein needs to account for variations in the production system, e.g. grain type, liveweight, maturity, use of hormonal growth promotants and β agonists. Opportunities to reduce total N fed to finishing cattle include oscillating supply of dietary CP and reducing supply of CP to better meet cattle requirements (phase feeding). | Publication Type: | Journal Article | Source of Publication: | Animal Production Science, 59(11), p. 2082-2092 | Publisher: | CSIRO Publishing | Place of Publication: | Australia | ISSN: | 1836-5787 1836-0939 |
Fields of Research (FoR) 2008: | 070204 Animal Nutrition | Fields of Research (FoR) 2020: | 300303 Animal nutrition | Socio-Economic Objective (SEO) 2008: | 830301 Beef Cattle | Socio-Economic Objective (SEO) 2020: | 100401 Beef cattle | Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article School of Environmental and Rural Science |
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