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
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Publication Date |
2014
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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).
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Citation |
Journal of Animal Science, 92(11), p. 5032-5040
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ISSN |
1525-3163
0021-8812
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Link | |
Publisher |
American Society of Animal Science
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Title |
The effect of incremental levels of dietary nitrate on methane emissions in Holstein steers and performance in Nelore bulls
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Type of document |
Journal Article
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Entity Type |
Publication
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