FOOD RESOURCES 2017. Issue N 8. Article 10

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Створено: П'ятниця, 11 січня 2019, 11:52
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10. Comparison of biological value calculation methods of organic and conventional milk protein
 
P. Petrov, Ya. Zhukova, F. Lystopad
Pages: 69-80
 
Abstract
Due to the rapid development of organic milk and dairy products’ production in Ukraine and in the world, the impact of the organic management type on the biological value of milk protein is becoming urgent. The aim of this work was to compare the effects of cattle feeding rations and season on studied organic and conventional farms on the amino acid composition of milk and biological value of milk protein. In the study two approaches to assess the protein’s biological value – PDCAAS (Protein Digestibility Corrected Amino Acid Score, 1991) and DIAAS (Digestible Indispensable Amino Acid Score, 2013), both approved by the joint Expert Commission of The Food and Agriculture Organization and The World Health Organization were used. The calculation methodology by PDCAAS showed similar values – 0.72 and 0.71 – in the indoor period for organic and conventional milk and 0.53 and 0.49 respectively during the outdoor period. The calculation methodology by DIAAS indicated that the values were lower compared to those of PDCAAS, and were 0.68 and 0.67 in the indoor period for organic and conventional milk, respectively, and 0.50 and 0.43 during the outdoor period. Thus, a novel approach for calculating protein biological value, DIAAS, , could assess the biological value of a protein more accurately comparing to previous type of calculation, due to using of ileal digestibility coefficient.
 
Key words: amino acid composition, organic milk, evaluation of biological value of a protein, DIAAS, PDCAAS.
 
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