Nelson Ruiz
Chemist, MS, PhD
Animal nutritionist with emphasis in poultry, feed quality assurance and quality control. Over 40 years of experience in the industry in feed formulation, antinutritional factors, metabolic problems.
Chemist, MS, PhD
Participation in Forum on October 4, 2021
Narasimha raju. Dear Mr Raju, the Delta pH method is available for purchase from AOCS Web site click on "Attain Lab Services" then "Methods" there you can purchase individual methods. In this case it is Method Ba 9-58. For the European Method you need to find The Journal Officiel des Communautés européennes, page L155/36 where you ...
Participation in Forum on September 28, 2021
Dr. Corzo, thanks for the effort to further investigate the digestible arginine/digestible lysine ratio in broilers. However, I have a few questions: 1- How do you reconcile your Conclusions and Applications in the paper of Mejía et al. (2012) of which you are also a co-author and those in your paper of 2021? In 2012 working also with Ross 708 you concluded that a minimum ratio of 110% was ...
Participation in Forum on August 24, 2021
Brendon Muko. Apparently I have not been clear: there is a correlation between urease activity and trypsin inhibitors in SOYBEAN MEAL. There is no such a relationship across different processing methods for FULL-FAT SOYBEANS.
Participation in Forum on August 17, 2021
Dear Dr. Albin, I am glad that you bring the issue of urease activity and trypsin inhibitors because it is clearly established in the work of several authors [McNaughton and Reece (1980); Mustakas et al., (1981); Ruiz (2012); Liu and Ruiz (2021)] that a high correlation exists between urease activity (delta pH) and trypsin inhibitors (expressed either as mg/g or TUI/mg) for SOYBEAN MEAL, particul ...
Participation in Forum on August 16, 2021
Rama Prasad Chakraborty Yes, absolutely, I also appreciate your opinion. However, unfortunately many in the industry have not explored the advantages of full-fat soybeans (FFSB) not only from the energy content standpoint of view, but also, as I wrote, from the opportunity to considerably decrease residual trypsin inhibitors to almost zero by proper processing. It is not easy to overprocess FFSB ...
Participation in Forum on July 29, 2021
Dear Dr. Koushik De. I find interesting your discussion on trypsin inhibitors and their role as antinutritional factors in broiler nutrition. It would be nice however, if you add a list of all the literature cited and provide credit where credit is due. Havenstein et al. (2003) didn't discuss trypsin inhibitors in their comparison of the 1957 and 2001 genetics, the slide that you have in your pape ...
Participation in Forum on February 13, 2021
Hashaam Chaudhry. Hello Hashaam, thank you for your participation. Of course not, fermented SBM under current economics is not going to be cost effective for massive production, that is not the purpose of fermented SBM. Fermented SBM is an opportunity to add value to specific fragments of the feed market where it will be justified, and where there will be a return on investment. Let´s say for e ...
Participation in Forum on December 14, 2020
Christoph Hutter. Dear Mr. Hutter, Absolutely, fermented soy bean meal with very low levels of both heat-labile and heat-stable anti-nutritional factors is an alternative to manage soy anti-nutritional factors in general, and in particular to manage rapid feed passage (a form of disbacteriosis in European terms) in broilers. We presented at the virtual Poultry Science Association meeting this year ...
Participation in Forum on October 28, 2020
Two quick responses: 1- Although we have not analyzed residual hexane in lots of commercial soybean meals involved in rapid feed passage in the field, there is not much justification to do that. First, hexane has been the main solvent used in the solvent-extraction process well before the 1990's when rapid feed passage started to be observed worldwide. Second, oilseed processing plants are quite e ...
Participation in Forum on October 12, 2020
Dear Mr. Hutter: Thank you for your comments. Here is in brief my response: 1- Yes indeed, rapid feed passage is observed mostly around 21 days of age and older in broilers depending on the actual concentration of trypsin inhibitors in the feed. Those trypsin inhibitors in the feed are derived either from soybean meal, or full-fat soybeans or both. However, in our experience, in several markets im ...
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Location:Atlanta, Georgia, United States
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Professional Title: Chemist, MS, PhD
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