02424nab a2200337 a 4500 AR-ReUNN 20260702002257.0 260630s1997 xxc|||||||||||||||||eng eng fre Mccaughey, W. P. 125527 Wittenberg, K. 125528 Corrigan, D. 125529 Methane production by steers on pasture / W. P. McCaughey; K. Wittenberg; D. Corrigan Ottawa Agricultural Institute of Canada 1997 6 p. Separata: Can J An Scs Ottawa : Agricultural Institute of Canada. Abstract In order to determine the quantity of methane (CH4) produced by steers on pasture, 16 steers with a mean weight of 356 +/- 25 kg were randomly selected from a larger group of cattle (n = 48) to evaluate the effects of grazing management and monensin controlled release capsule (CRC) administration on ruminal CH4 production using the sulphur hexafluoride (SF6) tracer-gas technique. Pasture management treatments consisted of two grazing systems (continuous stocking or 10-paddock rotational stocking) at each of two stocking rates (low, 1.1 steer ha-1 or high, 2.2 steers ha-1) with two replications of each pasture treatment. Half of the animals on each pasture treatment were administered a monensin CRC delivering 270 mg d-1, and untreated animals served as controls. During the 140-d grazing season, one steer from each treatment-replicate combination was sampled to determine daily intake and CH4 production on four occasions. The chemical composition of diets differed between grazing management treatments and sampling periods. Voluntary intake and CH4 production, adjusted for differences in body weight, were unaffected by grazing management, sampling period or by monensin CRC administration and averaged 0.69 +/- 0.1 L kg BW-1 d-1 across all grazing management treatments. The energy lost through eructation of CH4 averaged 4.5 +/- 1.4% of gross energy intake. Metano 116974 Producción 4624 Bovinos 6174 Pasturas 22902 Forrajes 10403 Digestion 114927 Alimentación de los Animales 2241 Eficacia 12357 Separatas 120950 Canadian Journal of Animal Science v. 76 n. 3 (1997) 223984 ART (AGROP)40652 217469 217469 217469 AR-ReUNN spa AR-ReUNN aacr2