Lindemann: The new NRC makes adjustments to the recommended amount of trace element zinc
NRC is related to the nutritional needs of sows for trace elements. In fact, in the past 50 years, before 1988, the amount of copper recommended in sow feed has not changed much. Among the commonly used trace elements, the only change is iron. In the past 50 years, the iron and sodium ratios of the 79 and 98 versions have probably increased by a factor of two, and the recommended amounts of other trace elements are not. What a big change.
From the data, there is not much change. Can we have 100% confidence in the data, or is there absolutely no problem or confidence in these additions? This must be based on a large amount of research data. If these studies show that the data is reasonable, then we are convinced that the data is correct. The actual scenario is that we have studied the demand for trace elements in sows for the past 50 years. Here we give an example. In the past 50 years, there were only 4 articles about copper in sow nutrition. Research report. The study of other trace elements is almost a report made 30 or 40 years ago.
In the case of animal trace element requirements, we need a lot of research reports to support our arguments. In terms of the nutritional needs of copper in commercial pigs, there are more than 150 such research reports to prove that the current standards are credible. Because we have more than 150 research reports to support the current recommended amount of copper on the hog.
We know that the NRC may review the entire nutritional needs of pigs every 10 years or so. We have organized such a committee of experts to discuss some of the latest research results. Do we need to make some new adjustments to the nutritional needs of pigs? The data we can get for sow nutrition is very limited.
Last June, the new edition of the 11th edition of the NRC Nutritional Needs, which was also summarized by the Expert Committee in some of the research reports over the past decade, has made some updates on the pig NRC standard.
Lindemann is the editor-in-chief of the 11th edition of the NRC for vitamins and trace elements in pig nutrition and is the first contributor and editor. In fact, from the 2011 and 2012 editions of NRC, the research reports on trace elements in pigs and breeding pigs are rare. In general, the recommended amount of vitamins and trace elements is not much in the 2012 edition. Variety.
Among them, only the recommended amount of three trace elements made some changes in the NRC version regarding the nutritional needs of the sow.
The old version, the 98 version of the NRC's recommended amount of copper in sow nutrition is 5PPM. Last year's new NRC certification increased the demand during pregnancy to 10ppm, and the demand during lactation increased to 20ppm, a fourfold increase. .
In fact, between the years of 1998 and 2012, there was no research on copper in sows. The change in these data was because they reinterpreted the copper nutrition in sows before 1998. Some research reports analyze the content. These analyses show that the recommended amount of NRC copper in version 98 is low. In 2012, the recommended amount of NRC copper in the sow nutrition was re-trimmed.
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