My figures would be 4.0, 4.25, 4.5, and 4.75 lbs per pig per day for weeks 17, 18, 19, and 20. After that 5 lbs per pig per day. This comes to 122 lbs (55.6 kgs) for the first 4 weeks, 140 lbs (63.5 kgs) for weeks 21 to 24.
So the total per pig from 17 to 24 weeks is 120 kg. My feed is more expensive than Mandy's, £7.00 for a 20 kg bag, so the total comes to £42 per pig, £84 for 2 pigs. Every week over 24 weeks old is another 35 lbs (15.9 kgs) per pig = £5.60 per pig per week at my feed prices. However, in another post on "fatty pigs", Chickenfeed talks about cutting back during the last 2 weeks - this is a new one on me and something I have not tried before. Our slaughter costs are £21 per pig, and fuel at whatever it costs. HTH Tamsaddle