Effect of incremental proportions of Desmanthus spp. in isonitrogenous forage diets on growth performance, rumen fermentation and plasma metabolites of pen-fed growing Brahman, Charbray and Droughtmaster crossbred beef steers

Author:

Mwangi Felista W.,Suybeng BenedicteORCID,Gardiner Christopher P.,Kinobe Robert T.ORCID,Charmley Edward,Malau-Aduli Bunmi S.ORCID,Malau-Aduli Aduli E. O.ORCID

Abstract

Desmanthus (Desmanthus spp.), a tropically adapted pasture legume, is highly productive and has the potential to reduce methane emissions in beef cattle. However, liveweight gain response to desmanthus supplementation has been inconclusive in ruminants. This study aimed to evaluate weight gain, rumen fermentation and plasma metabolites of Australian tropical beef cattle in response to supplementation with incremental levels of desmanthus forage legume in isonitrogenous diets. Forty-eight Brahman, Charbray and Droughtmaster crossbred beef steers were pen-housed and fed a basal diet of Rhodes grass (Chloris gayana) hay supplemented with 0, 15, 30 or 45% freshly chopped desmanthus forage on dry matter basis, for 140 days. Varying levels of lucerne (Medicago sativa) hay were added in the 0, 15 and 30% diets to ensure that all diets were isonitrogenous with the 45% desmanthus diet. Data were analyzed using the Mixed Model procedures of SAS software. Results showed that the proportion of desmanthus in the diet had no significant effect on steer liveweight, rumen volatile fatty acids molar proportions and plasma metabolites (P ≥ 0.067). Total bilirubin ranged between 3.0 and 3.6 μmol/L for all the diet treatments (P = 0.67). All plasma metabolites measured were within the expected normal range reported for beef cattle. Rumen ammonia nitrogen content was above the 10 mg/dl threshold required to maintain effective rumen microbial activity and maximize voluntary feed intake in cattle fed low-quality tropical forages. The average daily weight gains averaged 0.5 to 0.6 kg/day (P = 0.13) and were within the range required to meet the target slaughter weight for prime beef markets within 2.5 years of age. These results indicate that desmanthus alone or mixed with other high-quality legume forages can be used to supplement grass-based diets to improve tropical beef cattle production in northern Australia with no adverse effect on cattle health.

Funder

crc-p

Meat and Livestock Australia

Publisher

Public Library of Science (PLoS)

Subject

Multidisciplinary

Reference75 articles.

1. Meat & Livestock Australia (MLA). State of the industry report. The Australian red meat and livestock industry. Sydney, Australia; 2020. https://www.mla.com.au/globalassets/mla-corporate/prices—markets/documents/trends—analysis/soti-report/mla-state-of-industry-report-2020.pdf. Accessed 2020-03-23

2. Food and Agriculture Organization of the United Nations (FAO). Meat market review: Overview of global meat market developments in 2019. Rome, Italy; 2020. http://www.fao.org/3/ca8819en/CA8819EN.pdf. Accessed 2020-05-04

3. Challenges of beef cattle production from tropical pastures;DP Poppi;Rev Bras Zootec,2018

4. Correlation between production performance and feeding behavior of steers on pasture during the rainy-dry transition period;RKC Brandão;Trop Anim Health Prod,2018

5. Factors affecting the utilization of ‘poor-quality’ forages by ruminants particularly under tropical conditions;RA Leng;Nutr Res Rev,1990

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