The effect of incremental levels of dietary nitrate on methane emissions in Holstein steers and performance in Nelore bulls

Author(s)
Newbold, J R
van Zijderveld, S M
Hulshof, R B A
Fokkink, W B
Leng, Ronald
Terencio, P
Powers, W J
van Adrichem, P S J
Paton, N D
Perdok, H B
Publication Date
2014
Abstract
Two experiments were conducted to study effects of dietary nitrate on enteric methane production, blood methemoglobin concentration, and growth rate in cattle. In Exp. 1, 36 Holstein steers (288 ± 25 kg BW) were fed increasing levels of dietary nitrate (6 levels; 0 to 3.0% of feed DM) in corn silage–based total mixed rations. Nitrate was introduced gradually in a 25-d adaptation period before methane production was determined in environmentally controlled rooms. In the rooms, feed intake was restricted and similar among all treatments. Methane production (g/d) decreased linearly as dietary nitrate concentration increased (P <0.01). The apparent efficiency (measured methane reduction divided by potential methane reduction) with which enteric methane was mitigated was 49%. Blood methemoglobin levels increased with increasing nitrate dose. In Exp 2, 300 Nelore bulls (392 ± 28 kg) were fed increasing levels of nitrate (6 levels; 0 to 2.4% of feed DM) in highconcentrate total mixed rations offered ad libitum. Feed intake decreased linearly with increasing level of dietary nitrate(P <0.01). However, ADG was not affected by nitrate dose (P = 0.54), resulting in a linear improvement in G:F (P = 0.03) as dietary nitrate level increased. Carcass dressing percentage showed a quadratic response to incremental dietary nitrate, reaching the highest value at 0.96% of NO3/kg DM (P = 0.04).
Citation
Journal of Animal Science, 92(11), p. 5032-5040
ISSN
1525-3163
0021-8812
Link
Publisher
American Society of Animal Science
Title
The effect of incremental levels of dietary nitrate on methane emissions in Holstein steers and performance in Nelore bulls
Type of document
Journal Article
Entity Type
Publication

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