A review of factors influencing litter size in Irish sows

Table 1.2 Gestation feed curve for gilts calculated from NRC [26] equations and using the feeding pattern proposed by Tokach et al. [43]¹.

¹ For a gilt of 140 kg, gaining 30 kg in body weight (above the normal weight increase due to uterine growth, uterine fluids, products of conception and mammary tissue; assumed to be 22.8 kg) during pregnancy and fed a diet containing 13 MJ DE/kg.
² Increase feed curve at each stage by (1 MJ DE per day) or approx 4% for each 10 kg in sow weight above 140 kg.
³ Increase curve at day 13-45 by 6.2 MJ/day for each additional 10 kg in body weight gain required during gestation.
Note:
1. The above curves should not be used without consulting the footnotes. If unsure of any of the details an advisor or nutritionist should be consulted.
2. Sows that are extremely thin or that have lost excessive condition during lactation should always be fed to condition from the beginning of pregnancy.
3. An additional 1 MJ DE per day should be fed where effective temperature drops below 18°C.
4. Sows with mange or other parasites will require additional food.
5. Sows' condition should always be closely monitored during gestaion. If expected weight gains are not achieved then adjustments in the curve may be necessary.

ISSN: 2046-0481