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. 2020 Mar 15;100(4):1797-1805.
doi: 10.1002/jsfa.10217. Epub 2020 Jan 10.

Dietary supplementation of rumen-protected methionine decreases the nitrous oxide emissions of urine of beef cattle through decreasing urinary excretions of nitrogen and urea

Yuchao Zhao  1 , Md Sazzadur Rahman  1 , Guangyong Zhao  1 , Yu Bao  1 , Ke Zhou  1
Affiliations

Dietary supplementation of rumen-protected methionine decreases the nitrous oxide emissions of urine of beef cattle through decreasing urinary excretions of nitrogen and urea

Yuchao Zhao et al. J Sci Food Agric. .

Abstract

Background: Two consecutive trials were carried out to study the effects of dietary supplementation of rumen-protected methionine (RPM) on nutrient digestibility, nitrogen (N) metabolism (Trial 1), and consequently the nitrous oxide (N2 O) emissions from urine in beef cattle (Trial 2). Eight 24-month-old castrated Simmental bulls with liveweights of 494 ± 28 kg, and four levels of dietary supplementation of RPM at 0, 10, 20, and 30 g head-1 d-1 , were allocated in a replicated 4 × 4 Latin square for Trial 1 and the N2 O emissions from the urine samples collected in Trial 1 were measured using a static incubation technique in Trial 2.

Results: Supplementation of RPM at 0, 10, 20, and 30 g head-1 d-1 to a basal ration deficient in methionine (Met) did not affect the apparent digestibility of dry matter, organic matter, neutral detergent fiber, or acid detergent fiber (P > 0.05), but decreased the urinary excretions of total N (P < 0.05) and urea (P < 0.001), increased the ratio of N retention / digested N (P < 0.05) in beef cattle, and decreased the estimated cattle urine N2 O-N emissions by 19.5%, 23.4%, and 32.6%, respectively (P < 0.001).

Conclusion: Supplementation of RPM to Met-deficient rations was effective in improving the utilization rate of dietary N and decreasing the N2 O emissions from urine in beef cattle. © 2019 Society of Chemical Industry.

Keywords: beef cattle; methionine; nitrogen excretion; nitrous oxide; urine.

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