Effect of Post-Ruminal Urea Supply on Growth Performance of Grazing Nellore Young Bulls at Dry Season
The objective of this study was to evaluate the effect of the use of post-ruminal urea on performance, nitrogen metabolism and the ruminal environment of Nellore cattle reared on pasture during the dry season. In experiment 1 (Exp. 1), nine ruminal-cannulated Nellore steers, 30 ± 2 months old (651 ±...
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MDPI AG
2023-01-01
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| Online Access: | https://www.mdpi.com/2076-2615/13/2/207 |
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| author | Irene Alexandre Reis Mailza Gonçalves de Souza Yury Tatiana Granja-Salcedo Isabela Pena Carvalho de Carvalho Marco Aurélio De Felicio Porcionato Laura Franco Prados Gustavo Rezende Siqueira Flávio Dutra De Resende |
| author_facet | Irene Alexandre Reis Mailza Gonçalves de Souza Yury Tatiana Granja-Salcedo Isabela Pena Carvalho de Carvalho Marco Aurélio De Felicio Porcionato Laura Franco Prados Gustavo Rezende Siqueira Flávio Dutra De Resende |
| author_sort | Irene Alexandre Reis |
| collection | DOAJ |
| description | The objective of this study was to evaluate the effect of the use of post-ruminal urea on performance, nitrogen metabolism and the ruminal environment of Nellore cattle reared on pasture during the dry season. In experiment 1 (Exp. 1), nine ruminal-cannulated Nellore steers, 30 ± 2 months old (651 ± 45 kg body weight (BW)), were allotted to a 3 × 3 Latin triple square. In experiment 2 (Exp. 2), 84 Nellore bulls, 18 ± 3 months old (315 ± 84 kg BW), were distributed in complete randomized blocks, by initial BW. Protein supplements were supplied daily, in the amount of 2 g/kg BW, and consisted of either CONT: protein + conventional urea (50% CP), PRU: protein + post ruminal urea (50% CP) and U + PRU: protein + urea conventional + post-ruminal urea (70% CP). The paddocks were composed of <i>Urochloa brizantha</i> cv. Marandu grass. In Exp. 1, there was no treatment effect for DM, OM, NDF, forage intake, and CP, but there was a higher intake for PRU (<i>p</i> < 0.005) and a higher digestibility for U+ PRU (<i>p</i> = 0.001). There was no effect on ruminal pH or NH<sub>3</sub>-N concentration (<i>p</i> ≥ 0.232), but there was an interaction between treatment and time for them (<i>p</i> < 0.039). Furthermore, there was a treatment effect on the total SCFA concentration, with CONT being higher than the others. A difference in the acetate:propionate ratio was found (<i>p</i> < 0.027), with a greater relationship for PRU and U + PRU. A treatment effect (<i>p</i> = 0.049) was found for the propionate proportion, with a higher proportion in the CONT. Nitrogen intake was consequently lower for the CONT and higher urinary excretion for the U + PRU (<i>p</i> = 0.002). Animals supplemented with CONT showed a tendency to have more Bacteria and fewer Archaea (<i>p</i> = 0.086). In Exp. 2, there was a treatment effect for the disappearance rate of the supplement (<i>p</i> < 0.001). Intake was faster for PRU and CONT, but performance was not affected by PRU (<i>p</i> = 0.311). The use of post-ruminal urea alters the microbial population, but does not affect performance. Therefore, supplementation with post-ruminal urea presented similar results compared to conventional urea. Ruminal and blood parameters and animal performance were not influenced by treatments. |
| first_indexed | 2024-03-09T13:49:41Z |
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| last_indexed | 2024-03-09T13:49:41Z |
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| spelling | doaj.art-ff7290a2cba1419190e88ca9290c088f2023-11-30T20:52:43ZengMDPI AGAnimals2076-26152023-01-0113220710.3390/ani13020207Effect of Post-Ruminal Urea Supply on Growth Performance of Grazing Nellore Young Bulls at Dry SeasonIrene Alexandre Reis0Mailza Gonçalves de Souza1Yury Tatiana Granja-Salcedo2Isabela Pena Carvalho de Carvalho3Marco Aurélio De Felicio Porcionato4Laura Franco Prados5Gustavo Rezende Siqueira6Flávio Dutra De Resende7Department of Animal Sciences, São Paulo State University “Júlio de Mesquita Filho” (UNESP), Jaboticabal 14884-900, SP, BrazilDepartment of Animal Sciences, São Paulo State University “Júlio de Mesquita Filho” (UNESP), Jaboticabal 14884-900, SP, BrazilCorporación Colombiana de Investigación Agropecuaria (AGROSAVIA), Centro de Investigación El Nus, San Roque, Antioquia 053030, ColombiaTrouw Nutrition R&D, 3811 Amersfoort, The NetherlandsTrouw Nutrition R&D, Campinas 13080-650, SP, BrazilAgência Paulista de Tecnologia dos Agronegócios (APTA), Colina 14770-000, SP, BrazilDepartment of Animal Sciences, São Paulo State University “Júlio de Mesquita Filho” (UNESP), Jaboticabal 14884-900, SP, BrazilDepartment of Animal Sciences, São Paulo State University “Júlio de Mesquita Filho” (UNESP), Jaboticabal 14884-900, SP, BrazilThe objective of this study was to evaluate the effect of the use of post-ruminal urea on performance, nitrogen metabolism and the ruminal environment of Nellore cattle reared on pasture during the dry season. In experiment 1 (Exp. 1), nine ruminal-cannulated Nellore steers, 30 ± 2 months old (651 ± 45 kg body weight (BW)), were allotted to a 3 × 3 Latin triple square. In experiment 2 (Exp. 2), 84 Nellore bulls, 18 ± 3 months old (315 ± 84 kg BW), were distributed in complete randomized blocks, by initial BW. Protein supplements were supplied daily, in the amount of 2 g/kg BW, and consisted of either CONT: protein + conventional urea (50% CP), PRU: protein + post ruminal urea (50% CP) and U + PRU: protein + urea conventional + post-ruminal urea (70% CP). The paddocks were composed of <i>Urochloa brizantha</i> cv. Marandu grass. In Exp. 1, there was no treatment effect for DM, OM, NDF, forage intake, and CP, but there was a higher intake for PRU (<i>p</i> < 0.005) and a higher digestibility for U+ PRU (<i>p</i> = 0.001). There was no effect on ruminal pH or NH<sub>3</sub>-N concentration (<i>p</i> ≥ 0.232), but there was an interaction between treatment and time for them (<i>p</i> < 0.039). Furthermore, there was a treatment effect on the total SCFA concentration, with CONT being higher than the others. A difference in the acetate:propionate ratio was found (<i>p</i> < 0.027), with a greater relationship for PRU and U + PRU. A treatment effect (<i>p</i> = 0.049) was found for the propionate proportion, with a higher proportion in the CONT. Nitrogen intake was consequently lower for the CONT and higher urinary excretion for the U + PRU (<i>p</i> = 0.002). Animals supplemented with CONT showed a tendency to have more Bacteria and fewer Archaea (<i>p</i> = 0.086). In Exp. 2, there was a treatment effect for the disappearance rate of the supplement (<i>p</i> < 0.001). Intake was faster for PRU and CONT, but performance was not affected by PRU (<i>p</i> = 0.311). The use of post-ruminal urea alters the microbial population, but does not affect performance. Therefore, supplementation with post-ruminal urea presented similar results compared to conventional urea. Ruminal and blood parameters and animal performance were not influenced by treatments.https://www.mdpi.com/2076-2615/13/2/207performanceefficient nitrogen utilizationnon-protein nitrogenpost-rumen supplementation |
| spellingShingle | Irene Alexandre Reis Mailza Gonçalves de Souza Yury Tatiana Granja-Salcedo Isabela Pena Carvalho de Carvalho Marco Aurélio De Felicio Porcionato Laura Franco Prados Gustavo Rezende Siqueira Flávio Dutra De Resende Effect of Post-Ruminal Urea Supply on Growth Performance of Grazing Nellore Young Bulls at Dry Season Animals performance efficient nitrogen utilization non-protein nitrogen post-rumen supplementation |
| title | Effect of Post-Ruminal Urea Supply on Growth Performance of Grazing Nellore Young Bulls at Dry Season |
| title_full | Effect of Post-Ruminal Urea Supply on Growth Performance of Grazing Nellore Young Bulls at Dry Season |
| title_fullStr | Effect of Post-Ruminal Urea Supply on Growth Performance of Grazing Nellore Young Bulls at Dry Season |
| title_full_unstemmed | Effect of Post-Ruminal Urea Supply on Growth Performance of Grazing Nellore Young Bulls at Dry Season |
| title_short | Effect of Post-Ruminal Urea Supply on Growth Performance of Grazing Nellore Young Bulls at Dry Season |
| title_sort | effect of post ruminal urea supply on growth performance of grazing nellore young bulls at dry season |
| topic | performance efficient nitrogen utilization non-protein nitrogen post-rumen supplementation |
| url | https://www.mdpi.com/2076-2615/13/2/207 |
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