Table-2.
Methane emission by Sahiwal and Karan Fries heifers during two different feeding regimes.
| Parameters | Sahiwal | Karan Fries | ||
|---|---|---|---|---|
| Feed-1 | Feed-2 | Feed-1 | Feed-2 | |
| Body weight (kg) | 167.50±4.08 | 221.50±7.91** | 221.83±15.63 | 297.00±13.47** |
| Metabolic body weight (kg) | 46.54±0.85 | 57.38±1.53** | 57.34±3.05 | 71.47±2.43** |
| Basal metabolic rate (kg) | 3023.36±54.20 | 3710.45±96.89** | 3707.61±193.51 | 4599.94±153.66** |
| Mean% CH4 | 0.10±0.001 | 0.09±0.009 | 0.15±0.012 | 0.13±0.008 |
| VCH4 (ATPS) (L/min) | 0.05±0.001 | 0.04±0.005 | 0.08±0.008 | 0.07±0.009 |
| VCH4 (STPD) (L/min) | 0.04±0.001 | 0.03±0.004 | 0.06±0.007 | 0.06±0.007 |
| CH4 (L/day) | 62.20±1.74 | 56.93±7.01 | 100.55±10.59 | 92.49±11.32 |
| Energy loss as CH4 (kcal/min) | 0.40±0.01 | 0.37±0.04 | 0.65±0.06 | 0.60±0.07 |
| Energy loss as CH4 (kcal/day) | 587.81±16.46 | 538.03±66.32 | 950.26±100.12 | 874.06±107.00 |
| CH4*9.45 (kcal)/HP (kcal/min) | 10.04%±0.18 | 7.85%±0.81* | 12.36%±1.02 | 9.98%±0.91 |
*
p<0.05 and
**
p<0.01 differ significantly at 5% and 1% level, respectively, within breed.
STPD=Standard temperature and pressure, ATPS=Ambient temperature and pressure, HP=Heat production