Tag Archives: nitrogen balance

164–178 D.C. Santos, A.J.V. Pires, F.F. Silva, A.S. Ribeiro, W.R. Andrade, M.L. Albuquerque, I.C. Dutra, G.R.S. Oliveira, M.P. Sousa, R.B. Mendes, M.L.S. Santos and M.V. Amaral
TMR silage with sugarcane bagasse and urea: effects on intake, digestibility, and feeding behavior in dairy heifers
Abstract |

TMR silage with sugarcane bagasse and urea: effects on intake, digestibility, and feeding behavior in dairy heifers

D.C. Santos*, A.J.V. Pires, F.F. Silva, A.S. Ribeiro, W.R. Andrade, M.L. Albuquerque, I.C. Dutra, G.R.S. Oliveira, M.P. Sousa, R.B. Mendes, M.L.S. Santos and M.V. Amaral

State University of Southwest of Bahia, BR45700-000, Itapetinga, Bahia, Brazil
*Correspondence: amanda.s.ri@hotmail.com

Abstract:

This study evaluated the effects of total mixed ration (TMR) silage containing two levels of sugarcane bagasse (40% and 50% of dry matter), with or without urea inclusion (2.5%), on intake, nutrient digestibility, nitrogen balance, microbial protein synthesis, and feeding behavior of dairy heifers. Eight crossbred heifers were assigned to two simultaneous 4×4 Latin squares in a 2×2 factorial arrangement. Urea inclusion reduced (P < 0.05) dry matter and neutral detergent fiber intake but improved dry matter and crude protein digestibility. Increasing bagasse level to 50% reduced (P < 0.05) intake and digestibility of nutrients, reflecting the higher fiber content and lower energy density of the diets. Nitrogen balance and microbial protein synthesis were not affected by treatments. Higher bagasse levels increased rumination time per unit of NDF and the number of ruminal boli, indicating greater physical demand for fiber processing. Overall, TMR silage containing 40% sugarcane bagasse without urea provided the best balance between intake and nutrient utilization. These results highlight the importance of optimizing fiber levels and nitrogen sources in TMR silage to improve efficiency in dairy heifer feeding systems under tropical conditions.

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601–611 S. Tanchyk, D. Litvinov, A. Butenko, O. Litvinova, O. Pavlov, A. Babenko, N. Shpyrka, V.Onychko, I. Masyk and T. Onychko
Fixed nitrogen in agriculture and its role in agrocenoses
Abstract |
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Fixed nitrogen in agriculture and its role in agrocenoses

S. Tanchyk¹, D. Litvinov¹, A. Butenko²*, O. Litvinova³, O. Pavlov¹, A. Babenko¹, N. Shpyrka¹, V.Onychko⁴, I. Masyk⁵ and T. Onychko⁴

¹National University of Life and Environmental Sciences of Ukraine, Agrobiological faculty, Department of Agriculture and herbology, Heroyiv Oborony 12, UA03041 Кyiv, Ukraine
²Sumy National Agrarian University, Faculty of agricultural technologies and environmental, Plant growing Department, H. Kondratieva 160, UA40021 Sumy, Ukraine
³National University of Life and Environmental Sciences of Ukraine, Agrobiological faculty, Department of Agricultural chemistry and quality of plant products, Heroyiv Oborony 12, UA03041 Кyiv, Ukraine
⁴Sumy National Agrarian University, Faculty of agricultural technologies and environmental, Department of Selection and seeds named after M.D. Honcharov, H. Kondratieva 160, UA40021 Sumy, Ukraine
⁵Sumy National Agrarian University, Faculty of agricultural technologies and environmental, Department of Agriculture, soil and agrochemistry, H. Kondratieva 160, UA40021 Sumy, Ukraine
*Correspondence: andb201727@ukr.net

Abstract:

On typical low-humus black soils in short crop rotations with legumes (25–33%) and without them, it was found that depending on the set of crops in crop rotation and application of fertilizer rates, nitrogen yield per crop is from 355 kg ha-1 to 682 kg ha-1. The recommended fertilization system provided nitrogen compensation for crop yields by only 31–76%. Hence, in the plant-fertilizer system nitrogen deficiency varies from 161 to 370 kg ha-1. The greatest nitrogen deficiency in the soil is observed in crop rotation without the use of fertilizers with the following crop rotation: peas-winter wheat-grain maize-spring barley. The main source of nitrogen for plants is soil nitrogen. In crop rotations with legumes, biological nitrogen is supplied from the air, which in quantitative terms per rotation in crop rotations with peas is 109–288 kg ha-1, with soybeans 264–312, and with alfalfa 486 kg ha-1. Biological nitrogen in crop rotations with peas and soybeans is reimbursed from 25 to 62%, in crop rotation without legumes – 9% (non-symbiotic nitrogen fixation), and in crop rotation with alfalfa – 89% of the total nitrogen removal with the crop.

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