Since the arrival of the swine epidemic diarrhea (PED) virus in the United States in April 2013, nearly 10 million piglets have died so far. Such huge data has sounded an alarm on the pig production chain and has to be widely valued. “This is not just a simple problem of swine epidemic diarrhea, but a biosafety issue. We need to strengthen our defenses at all levels, especially in the feed industry.†R.B. Baker·DVM, Senior Doctor, Iowa State University, USA MS said. As the saying goes, the disease is from the mouth, and the feed is the first line of defense against swine epidemic diarrhea.
It is reported that the PED virus will grow especially in cold weather. What kind of mitigation measures should the feed mill take to reduce the risk of transmission of ?
Cleaning and disinfection must be two separate steps, focusing on cleaning will first improve the disinfection of the product. “There are a lot of disinfectants on the market that claim to inactivate the PED virus. I personally think it can be trusted, but when using a disinfectant to inactivate the PED virus, adequate exposure and sufficient time are the focus,†Baker said. “This virus is It is not difficult to deal with."
This is a very critical part of raw material procurement. Therefore, when purchasing the feed, the buyer of the feed mill must inquire about the feed supplier in detail, where they get the raw materials, and ensure the quality of these raw materials.
The storage environment should ensure that the feed products and raw materials are properly stored in an isolated, dry and temperature-friendly environment, which is the key to preventing the contamination of feed products and raw materials. Be sure to clean and disinfect the empty storage compartment when you are not storing your feed. Storing a larger number of products, storing them for more than a week, or storing them in a high temperature environment can reduce the risk of infectious virus survival.
Six-day rule In general, PED virus is difficult to survive in feed for more than 6 days under dry conditions. Therefore, storing the feed for more than 6 days may inactivate the PED virus. It is recommended that the manufacturer reserve more storage time when ordering the feed. Baker said that the technology came from the United States, and that before the eradication of pseudorabies, people used to deal with the pseudorabies virus. That is, before the corn is pulverized into feed, it is placed in a dry, well-ventilated silo for 30 days to evaporate the water in the corn and inactivate the virus.
High temperature antivirus PED virus is inactivated when the feed is properly heated. It is recommended to continue heating the feed to 200 ° C to inactivate the PED virus.
Piglet feed, if the feed temperature of the piglet is low, will increase the chances of survival. The normal feed granulation process is heated to 160 ° C ~ 200 ° C, less than a minute. However, there is a problem that the palatability of piglets will be reduced in the case of increased heat in the feed mill. There is no better solution. The key is to ensure that these feeds are properly managed, stored and transported after delivery to prevent contamination.
Sampling inspection This is a very safe and effective way for the feed mill to prove to the customer that the feed produced by the factory is free of PEDV. Therefore, in order to gain customer trust, feed mills should consider a wide range of sampling, including environmental sampling, feed ingredient sampling and vitamin feed sampling. However, it should be emphasized that in order to prove that the PED virus is negative, the difficulty is relatively large, and it is necessary to have enough sampling statistics. Some people say that the polymerase chain reaction (PCR) test can verify the presence of PED virus, but this method will produce inconsistencies when testing feed ingredients. Therefore, the use of PCR technology to analyze feed samples and ingredients can lead to false positives and false negatives, which in turn increases the risk.
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