Imants Jansons, Lilija Degola, Vita Sterna

Last modified: 02.05.2021


The aim of study was to estimate the processing technology of soybeans produced in Latvia and to compare the possibilities of using the obtained soybean cake with imported soybean meal in the feeding of lactating sows and their offspring. From soybeans, which were processed into animal feed, we obtained a product with a high content of protein. The control group of sows and fattening pigs received the imported soybean meal mixed into the compound feed, but the trial groups compound feed was mixed with soybean cake grown and processed in Latvia. Fattening pigs were weighed regularly. Feed consumption was counted and feed conversion was calculated. Was determined meat quality, carcases weight, carcases length. The chemical composition of the manure was analysed. Statistical analysis of data was performed with SAS / STAT 9.22 software package. The inclusion of soy cakes grown and processed in Latvia in lactating sow feed increased sow milk yields traits by 3.9% at 21 day of piglet age. At the end of experiment higher live weight by 3.42% were found in the trial group. Carcass quality indicators and chemical composition of meat did not show significant differences. Was observed a tendency to decrease in manure the content of organic matter in the trial group by 3.25%, decrease levels of total phosphorus and ammonium nitrogen compared to the control group. Using soybean cakes grown and processed in Latvia is possible to develop feed rations that showed similar pig growth results to imported soybean meal.


extrusion technology, soybean cakes, pig feeding


Navicha, W.B., Y. Hua, K. Masamba and C. Zhang. ” Effect of roasting temperatures and times on test parameters used in determination of adequacy of soybean processing“. Adv. J. Food Sci. Technol. 13, 2017, pp. 22-28. [Online]. Available: https://www.researchgate.net/publication/318254957_Optimization_of_soybean_roasting_parameters_in_developing_nutritious_and_lipoxygenase_free_soymilk [Accessed March 16, 2021]

P. Florou-Paneri, E. Christaki, I. Giannenas, E. Bonos, I.  Skoufos, A. Tsinas, A. Tzora and  J. Peng. “Alternative protein sources to soybean meal in pig diets”. Journal of Food, Agriculture & Environment . Vol.12 (2): 2014, pp. 655-660. [Online]. Available: https://www.cabdirect.org/cabdirect/abstract/20143310441. [Accessed March 18, 2021].

H. H. Stein, J. A. Roth, K. M. Sotak and O. J. Rojas. “Nutritional Value of Soy Products Fed to Pigs”. University of Illinois, Urbana-Champaign 'Swine Focus'. 01 August 2013

[Online]. Available. https://www.thepigsite.com/articles/nutritional-value-of-soy-products-fed-to-pigs [Accessed March 16, 2021].

N. Javed, M. T. Javed, M. A. Mirza, G. Saleem, B. Aslam, F. Manzoor, A. Rehman, M. Aslam, M. N. Bhutta, S. Faizan “Pathological effect of replacement of solvent extracted soybean meal with expeller extracted soybean meal in broilers”. Chemistry Pakistan Journal of Agricultural Sciences. V. 57(4); 2020, pp. 969-973.

G. S. Gilani, K. A. Cockell, E. Sepehr. “Effects of antinutritional factors on protein digestibility and amino acid availability in foods”. J. AOAC Int.; 88.1989, pp.967–987. [Online]. Available: https://pubmed.ncbi.nlm.nih.gov/16001874/ [Accessed March 16, 2021].

G. Grant. ”Antinutritional effects of soybean  a  review”. Prog. Food Nutr. Sci. (Oxford) 1989; 13(3-4) :317–348. [Online]. Available: https://pubmed.ncbi.nlm.nih.gov/2699045/

[Accessed March 17, 2021].

M. Ramos. Why Extrude Soybeans. November 3, 2016. [Online]. Available: https://www.insta-pro.com/en/blog/nutritionandtechnologies/why-extrude-soybeans/ [Accessed Mart 10, 2021].

R. Yasothai. “ Antinutritional factors in soybean meal and its deactivation”. International Journal of Scie nce, Environment and Technology. ISSN  2278-3687 (O), Vol. 5, No 6, 2016, pp. 3793 – 3797.

Y. Liu, O. J. Rojas, and H. H. Stein. “Effects of extrusion of corn and oats on the digestibility of energy and nutrients in diets fed to pigs”. J. Anim. Sci. 93(Suppl. 2): 2015, pp.134–135. [Online]. Available:  https://nutrition.ansci.illinois.edu/node/1014 [Accessed March 15, 2021].

O. J. Rojas, E. Vinyeta and H H Stein. “Effects of pelleting, extrusion, or extrusion and pelleting on energy and nutrient digestibility in diets containing different levels of fiber and fed to growing pigs”. J. Anim. Sci. 94: 2016, pp.1951–1960. [Online]. Available: Oxford Academic Online ttps://academic.oup.com/jas/article-abstract/94/5/1951/4701614 [Accessed March 18, 2021].


D. A. Rodriguez, S. A. Lee, M. R. C. de Godoy, H. H. Stein. “Extrusion of soybean hulls does not increase digestibility of amino acids or concentrations of digestible and metabolizable energy when fed to growing pigs”. Translational Animal Science, Volume 4, Issue 3, July 2020, txaa169.

[Online]. Available: Oxford Academic Online, https://academic.oup.com/tas/article/4/3/txaa169/5903553. [Accessed March 18, 2021]. https://doi.org/10.1093/tas/txaa169

D. Miladinovic. Optimising the extrusion process. 20-05-2019. [Online]. Available: https://www.allaboutfeed.net/author/dejan-miladinovic/

[Accessed March 18, 2021].

Pig welfare requirements Regulations of the Cabinet of Ministers No. 743. [Online]. Available: https://likumi.lv/ta/id/194745-cuku-labturibas-prasibas [Accessed March 16, 2021].

L. Degola, V. Sterna, I. Jansons, S. Zute. “The nutrition value of soybeans grown in Latvia for pig feeding”. Agronomy Research 17(5), 2019, pp. 1874–1880. [Online].Available:

http://dspace.emu.ee/xmlui/handle/10492/5099 [Accessed March 18, 2021].


B. Grisdale, , L. L. Christian.; H. R Cross; D. J. Meisinger, M. F. Rothschild and R. G. Kauffman. "Revised Approaches to Estimate Lean of Pork Carcasses of Known Age or Days on Test". Animal Science Publications. 1984, pp. 312.

Rules for the classification of animal carcase. Regulations of the Cabinet of Ministers No. 416. [Online]. Available https://likumi.lv/ta/id/300432-dzivnieku-liemenu-klasifikacijas-noteikumi [Accessed March 16, 2021].

I. Jansons, L. Degola, V. Sterna and S. Zute. “Influence of local extruded soybean cake and imported soybean meal on fattening pig productivity and pork quality”. Agronomy Research, 18 (Special Issue 2) 2020, pp. 1307-1315. [Online]. Available: https://dspace.emu.ee/xmlui/handle/10492/5700 [Accessed March 16, 2021]. https://doi.org/10.15159/AR.20.102

M. A. Ibáñeza, C. de Blasb, L. Cámarab, G. G. Mateosb. “Chemical composition, protein quality and nutritive value of commercial soybean meals produced from beans from different countries: A meta-analytical study”. Animal Feed Science and Technology. Volume 267, September 2020, 114531. [Online]. Available: https://www.sciencedirect.com/science/article/pii/S0377840120304351 [Accessed March 16, 2021].


F. Aherne. Feeding the lactating sow. Pork Information Gateway Factsheet PIG 07-01-05. 2005. [Online]. Available: https://porkgateway.org/resource/feeding-the-lactating-sow-2/ [Accessed March 15, 2021].

D. E. Reese, R. C. Thaler, M. C. Brumm, A. J. Lewis, P. S. Miller, and G. W. Libal. "Swine Nutrition Guide". Faculty Papers and Publications in Animal Science . 69. 2000. [Online]. Available: https://digitalcommons.unl.edu/animalscifacpub/694 [Accessed March 16, 2021].

S. J. Hawe, N. Scollan, A. Gordon, E. Magowan. “Impact of sow lactation feed intake on the growth and suckling behavior of low and average birthweight pigs to 10 weeks of age” Translational Animal Science, Volume 4, Issue 2, April 2020, pp. 655–665. [Online]. Available: Oxford Academic Online, https://academic.oup.com/tas/article/4/2/655/5835298 [Accessed March 12, 2021]. https://doi.org/10.1093/tas/txaa057




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