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

2014

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).

Journal of Animal Science, 92(11), p. 5032-5040

1525-3163

0021-8812

https://hdl.handle.net/1959.11/21889

en

American Society of Animal Science

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

Journal Article

Publication