| Feed stuff | DE (MJ/kg) | Order based on digestible energy | NE (MJ/kg) | Order based on net energy |
| Soybean meal | 14.7 | 1 | 8.1 | 4 |
| Wheat | 13.9 | 2 | 10.5 | 2 |
| Maize | 13.9 | 2 | 11.1 | 1 |
| Cassava | 12.6 | 3 | 10 | 3 |
| Wheat bran | 9.3 | 4 | 6.3 | 5 |
Protein-rich ingredients
It is evident that a protein-rich ingredient like soybean meal that ranks high in the list when ordered by DE content does not fare equally well in terms of NE. It is equally interesting to note that maize and wheat, which contain similar levels of digestible energy are quite different in net energy content. This is due to the higher level of protein and the presence of anti-nutritional factors, such as polysaccharides, in wheat.
How does this translate into practical terms? It makes little difference if you use GE or NE, or anything in between, as long as you always use the same cereals and protein sources and you're achieving maximal growth in your pigs.
But, when it comes to replacing one ingredient with the other or when trying to manipulate growth performance and carcass characteristics, anything but the NE system will result in inaccuracies, with over- or under-supply of energy in relation to other nutrients. This translates to lost profitability no less!
So, check your matrix again and make sure you have NE values in there!
1.Highly useful and excellent
Dr.R.Bhaskaran at 23-08-2008 17:54
2.hitherto I am using maize,ragi,polishricehusk, and other ingrediyats to my piglets. This costs Rs.100 per piglets and also vegetables. Do you have any other information than this.
harryfernandes at 25-08-2008 18:28
3.More than a comment, an inquire on the availability of information about energy requirements expressed in NE, as well as NE values of feedstuffs
Juan Kalinowski at 26-08-2008 15:32
4.can i use bird feather as alternative to soya bean in the feeding of pig
abiodun at 26-08-2008 21:00
5.Not all feed ingredients have published net energy values. Where can we get them?
Gerry at 29-08-2008 05:16
6.May I know if cassava contains any protein.
Kwame at 30-08-2008 22:19
7.Kwame, according to INRA2004 Tables, dried cassava root (70% starch, 97% dry matter) contains 2.5% crude protein.
Ioannis Mavromichalis at 06-10-2008 14:21
8.Juan, I use the INRA Tables. Check the Nottingham University Press or Wageningen Academic Publishers websites. These places sell this book (it's a green one!)
Ioannis Mavromichalis at 06-10-2008 14:22
9.Gerry, you're correct, not all ingredients have been tested for NE. Nevertheless, the French institute INRA has published well researched regression equations that predict fairly accurately the NE content in almost every feedstuff based on its chemical composition. Check my answer below to find where you can buy the Green book where you might find all the information you need.
Ioannis Mavromichalis at 06-10-2008 14:24
10.Abiodun, hydrolyzed feather meal is not as good a protein source as soybean meal. It is deficient in lysine AND histidine. It has very low palatability. Its protein is quite undigestible and it risks the problem of Salmonella contamination. I would only use it in diets for growing-finishing pigs and gestating sows adding no more than 2% in the final feed.
Ioannis Mavromichalis at 06-10-2008 14:28
11.Harry Fernanders, if you're satisfied with the performance of your piglets, then there is not much to add. If not, then you should consider adding some protein sources and balancing the amino acids. Also, adding some salt always helps...
Ioannis Mavromichalis at 06-10-2008 14:30
12.I think so that using NE is much accurate than ME. But on the other side, you think it is best to formulate based on digestible amino acis rather than total?
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