The impact of controlling diseases of significant global importance on greenhouse gas emissions from livestock production

Table 4 Baseline swine performance parameters

Performance parameter	Value
Age at first farrowing (d)^a	367
Annual litters per sow^b	2.00
Annual pigs sold per sow (head)^c	19.4
Finished pig age at slaughter (mo)^d	8.40
Finished pig weight at slaughter (kg)^e	116
Finished pig carcass weight (kg)^e	83.6
Mean number of growing pigs in the herd per sow (head)^f	13.6
Proportion of sows in the population^g	0.07
Proportion of growing pigs in the population^h	0.93
Potential growing pigs lost per sow death (head)^j	19.4
GHGe per kg pigmeat (kg CO₂eq)^j	6.07
GHGe per kg pigmeat attributed to sows (kg CO₂eq)^k	1.15
GHGe per kg pigmeat attributed to growing pigs (kg CO₂eq)^k	4.92

^a[19, 20]
^b Based on 2.35 litters per sow in intensive systems and 1.65 litters per sow in extensive systems
^c[21,22,23]
^d Based on 170 d age at slaughter in intensive systems and 365 d age at slaughter in extensive systems
^e[17]
^f Based on the age at slaughter and number of pigs produced per sow annually
^g The reciprocal of the mean number of growing pigs in the population per sow
^h 1 – the reciprocal of the mean number of growing pigs in the population per sow
ⁱ Calculated from live pigs born per year. the pigs that would otherwise have been born in the time taken to rear a gilt to replace that sow (age at first farrowing) and the CW pigmeat yield per animal
^j[11]
^k Calculated based on data from [24] applied to that of[11]

ISSN: 2524-4655