The following are recommendedlevels and maximum inclusion rates of protein source ingredients in the rationsfor pigs.
SoyBeans and By-Products:
Soy protein has a very highlysine content, which make this protein source very valuable. It also containsan Anti-Trypsin Factor (ATF), a growth stunting component that disturbs theprotein digestion. It can be eliminated by toasting the soybean. It’s crude protein content ranges from 36%-43 % depending on the varieties and other environmental factors.
Sow can take up to 15%,Fatteners not more than 10%, to avoid soft bacon weaners and piglets can takeup to 10%.
Soybean meal: This is a byproduct after oil extraction by chemicalmethod and its price is always higher than of soy bean. It has a high proteincontent of good quality (about 45%), additionally a high lysine content (2.5-3%) all other oil seed by products are far low.
Sows and fatteners can take as much as is needed to meet their protein and lysine requirements (10-30%). For sows the soy protein may be some animal protein; fatteners do not need animal protein.
Soy bean meal contain somesugars that piglets find hard to digest. In cases of much diarrhea it issuggested to keep the soy bean meal below 15% and add a synthetic lysine. Also,piglets must have some animal protein in their feed since Soy bean meal has lowin methionine amino acid.
Cottonseed cake/ expeller: The CP of it is around 35%. It has moderateamount of lysine and methionine amino acids. Pigs should not take more than 10%of a good quality, due to the high content of crude fiber, and the negativeinfluence on bacon color
Sunflower cake; it has about29% CP, and high content of methionine (1.1%). Generally, no more than 10%, dueto high crude fiber and soft fat property.
Coconutcake: This has crude protein level of 21%, high level ofaflatoxin as well as crude fiber.
Sows take maximum 7.5%, for itscrude fiber rate. But it has a positive effect on fat quality, and it is verytasty. Piglets preferably none; they do not tolerate it very well.
Productsof Animal Origin
The nutritional quality ofanimal protein is higher than that of vegetable protein. Most animal proteinsare rich in minerals and vitamins.
Fishmeal: it’s unfortunate that the protein content of it variessignificantly depending on a number of factors some of which have remained undisclosed! Disclosed factors include the source, the storage and preservationmethods to mention a few because some people go ahead and adulterate it.
The CP of fish meal rangesfrom 50% to 75% and therefore need great attention. It has reasonable amount oflysine (about 5%).
Sows can take maximum 5%. Fishmeal has a positive effect on sow fertility. Fatteners can take maximum 5%.more may put a fish flavor on the meat. As a matter of fact, fatteners can dovery well on a complete vegetable feed. Piglets should get 1-5% fish meal if noother animal proteins are added.
Bloodmeal: This is rich in protein, including a lot of lysine (8.5%),rich in Fe, poor in Ca and P
In compound feed, no more than2% should be mixed. High level of it affects taste and appetite, and maydevelop cannibalism.