New norms for sodium and chloride
Experiments with piglets have shown that higher levels of sodium and chloride than the previous norms have positive effect on piglets feed intake, growth, feed utilization and protein digestibility in the first three weeks after weaning.
In particular, a high content of chloride appears to be beneficial for protein digestibility. This is probably due to the fact that chloride is needed for the pigs hydrochloric acid production in the stomach.
Trials have shown the biggest effect of more sodium and chloride levels on the piglets from 6 to 9 kg.
For slaughter pigs the norm has not been changed, where as a little more is recommended in case of phase feeding, sodium and chloride in starter mixes and slightly less in final mixes.
The norm for sows is unchanged. Amount theoretical calculation indicate that the current norm ensures sufficient sodium and chloride in relation to the need of milk production.
|Tab 1. Effect from adding of NaCl to feed for weaners. Weight of piglets after weaning is 6,5 kg.|
|Na content, g/FUpig||1,7||2,3||3,0||3,7|
|Daily gain, 0-7 days*||168||188||214||210|
|Daily gain, 7-14 days*||329||374||411||414|
|Daily gain, 14-21 days||481||515||508||508|
|FCR, FUpig/kg growth, 0-7 days**||2,09||1,72||1,63||1,71|
|FCR, FUpig/kg growth, 7-14 days**||1,99||1,74||1,72||1,62|
|FCR, FUpig/kg growth, 14-21 days||1,90||1,75||1,91||1,87|
*Significant linear effect, P <0,01. **Significant effect according to 2nr degree function, P <0,01
Data from the trial demonstrate positive effect on feed for weaners with 2,5 g Na and 4,1 g Cl right after weaning. Positive effect is reachable with bigger amounts of Na and Cl.
Based on literature studies, the norms for sodium and chloride are calculated according to the amount of feed animal can consume. On the first stages of life piglets eat less per kg of growth.
Source: SEGES svineproduktion, note 1820.