Bìol. Tvarin, 2016, Volume 18, Issue 3, pp. 23–29



T. A. Yeletska, N. V. Vasylevlsky, L. E. Berestova, G. V. Minenko, MSAbdulaeva

This email address is being protected from spambots. You need JavaScript enabled to view it.

Institute of Animal Science of the National Academy of Agricultural Science,
3 Syomoyi Gvardiyskoyi Armiyi
str., Kulynychi,Kharkiv District,Kharkiv Region, 62404, Ukraine, it_secrt@ukr.net

Transit dietary protein that has avoided rumen degradation is an important factor of the most efficient use of dietary protein by cattle. Such protein is referred to as ‘bypass protein’ so that it could be distinguished from general available dietary digestible protein and from one that is fermented in the rumen of dairy cattle.

In the research on Red-and-White heifers with rumen and duodenal fistulas implanted, provision of the animals with energy, digestibility, availability and assimilation rate of separate dietary substances in the rumen, small intestine and throughout the entire gastrointestinal tract with a conventional diet and a diet including bypass product were determined.

It was established that including bypass product in the conventional mixed feed for dairy cattle diet has increased both overall nutritional value and assimilation rate of nutrients by animal bodies. Provision of animals with energy, when bypass product diet was used, significantly increased by 8.6 % due to improved digestibility of crude fibre and nitrogen-free extractive substances in the experimental cattle rumen. When the bypass product was included into the dairy cattle diet, availability of raw protein for digestion in the small intestine increased significantly by 9.1 %. Feeding the bypass product diet increased apparent digestibility of practically all nutrients, raw fat and raw protein significantly by 14.5 % and 16.95 %, respectively, throughout the gastro-intestinal tract.


1. Orskov E. R. Protein nutrition in ruminants. Moscow, Agropromizdat, 1985, 183 p. (in Russian)
2. Kalashnikov A. P., Fisinin V. I., Shcheglov V. V., Kleimenov N. I. Norms and rations of feeding of agricultural animals (3rd ed). Moscow, 2003, 456 p. (in Russian)
3. Kurilov N. V., Sevastianov N., Korshunov V. N. The study of digestion in ruminants: a method. decree. Science works of VNIIFBiP, Borovsk, 1987, 105 p. (in Russian)
4. Kalnitsky B. D. Kalashnikov V. V. Results and prospects of research in the field of biology of farm animals. Problems of biology productive animals, RAAS, 2007, no. 1, pp. 6–11. (in Russian)
5. Kharitonov E. L. Comprehensive study of processes of cicatricial and intestinal digestion at ruminants in connection with forecasting of formation of end products of digestion of forages Dr. biological sci. autoref. diss., Borovsk, 2003, 51 p. (in Russian)
6. Kharitonov E. L., Kalnitsky B. D. Optimization of a feed of cows in the beginning of the lactation wish count of quantity and the ratio of end products of digestion of the forage. J. of animal science, Sofia, 5, 2005, pp. 32–38.
7. Kharitonov E. L. Physiological substantiation of optimal substrates relations as part of the exchange energy for dairy cows. Science works of VNIIFBiP, 2004, vol. 43, pp. 83–92. (in Russian)
8. Poghosyan D. G. Protected protein in the diets of fattening. Niva Povolzhya, 2011, no. 2, pp. 94–99. (in Russian)
9. Grigoriev N. G., Volkov N. P. Biological value of feed. Moscow, Agropromizdat, 1989, 287 p. (in Russian)
10. Kalnitsky B. D., Zabolotnov L. A., Materikin A. M.. Kharitonov E. L. New approaches to the assessment of nutritional feed ration and regulation of feeding ruminant animals. Bulletin of the RAAS, 2000, no. 2. pp. 12–15. (in Russian)
11. Ryadchikov V. G. Fundamentals of nutrition and feeding of agricultural animals. Krasnodar, KGAU, 2014, pp. 29–50. (in Russian)
12. Araba M, Dale N. M. Evaluation of protein solubility as an indicator of over processing soybean meal. Poultry Science, 1990, vol. 69, pp. 76–83. https://doi.org/10.3382/ps.0690076
13. Parand E, Vakili A, Mesgaran M. D., van Duinkerken G, Yu P. Truly Absorbed Microbial Protein Synthesis, Rumen Bypass Protein, Endogenous Protein, and Total Metabolizable Protein from Starchy and Protein-Rich Raw Materials: Model Comparison and Predictions. J. Agric Food Chem., 2015, vol. 63 (29), pp. 6518–6524. https://doi.org/10.1021/jf505961e
14. Theodoridou K, Yu P. Metabolic characteristics of the proteins in yellow-seeded and brown-seeded canola meal and presscake in dairy cattle: comparison of three systems (PDI, DVE, and NRC) in nutrient supply and feed milk value (FMV). J. Agric Food Chem., 2013, vol. 61 (11), pp. 2820–2830. https://doi.org/10.1021/jf305171z
15. Miller G. L. Protein determination for large numbers of samples. Anal. Chem., 1999, vol. 31, no. 5, pp. 964–966.
16. Ferguson J. D. Milk Urea Nitrogen. Center for Animal Health and Productivity, University of Pennsylvania, 2001. Available at: http://cahpwww.vet.upenn.edu/mun/mun.html.
17. Ipharraguerre I. R., Clark J. H., Freeman D. E. Varying protein and starch in the diet of dairy cows. I. Effects on ruminal fermentation and intestinal supply of nutrients. J. Dairy Sci., 2005, vol. 88 (7), pp. 2537–2555. https://doi.org/10.3168/jds.S0022-0302(05)72931-3
18. Ipharraguerre I. R., Clark J. H., Freeman D. E. Rumen fermentation and intestinal supply of nutrients in dairy cows fed rumen-protected soy products. J. Dairy Sci., 2005, vol. 88 (8), pp. 2879–2892. https://doi.org/10.3168/jds.S0022-0302(05)72969-6
19. Burroughs W., Trenkle A. H. & Vetter R. L. Principles for the use of non-protein nitrogen and by-pass proteins in diets of ruminants. Vet. Med. Small Anim. Clin., 1971, vol. 66, 238 p.
20. Sinclair K. D., Garnsworthy P. C., Mann G. E., Sinclair L. A. Reducing dietary protein in dairy cow diets: implications for nitrogen utilization, milk production, welfare and fertility. Animal, 2014, vol. 8 (2), pp. 262–274. https://doi.org/10.1017/S1751731113002139
21. Vasilevskyi N. V. The Availability of crude protein for digestion in the small intestine and the flow of endogenous nitrogen in the complex stomach of calves. Dr. philosophyl sci. diss., Kharkiv, 1993, 127 p. (in Russian)
22. Nehring K., Schiemann R., Hoffman L. A new system of onergetic evaluation of food on basis of net energy for fattening. Metabolism of Farm Animals, London, Oriel Press, 1969, 360 p.






WorldCat Logo