Protein and Carbohydrate Fractions in Warm-Season Pastures: Effects of Nitrogen Management Strategies
| Autor: | Ricardo Andrade Reis, Abmael da Silva Cardoso, Robert M. Boddey, Luis O Tedeschi, Andressa Scholz Berça, Ana Cláudia Ruggieri, Vanessa Zirondi Longhini |
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| Přispěvatelé: | Universidade Estadual Paulista (Unesp), Texas A&M Univ, Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_element
Arachis pintoi herbage mass Fractionation chemistry.chemical_compound Animal science Human fertilization pintoi peanut Legume Completely randomized design biology Brachiaria brizantha 0402 animal and dairy science Agriculture 04 agricultural and veterinary sciences biology.organism_classification 040201 dairy & animal science Nitrogen Neutral Detergent Fiber chemistry 040103 agronomy & agriculture Urea 0401 agriculture forestry and fisheries mixed pastures Agronomy and Crop Science |
| Zdroj: | Agronomy, Vol 11, Iss 847, p 847 (2021) Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP Agronomy Volume 11 Issue 5 |
| ISSN: | 2073-4395 |
| Popis: | Nitrogen (N) management affects herbage production and chemical composition however, information on the impact of tropical herbage on N and carbohydrate fractions is scarce. A two-year study was conducted to investigate the potential use of pintoi peanut (Arachis pintoi) compared with N fertilization of palisade grass (Brachiaria brizantha cv. Marandu) by evaluating the herbage chemical composition (fractionation of protein and carbohydrate), herbage mass and accumulation rate, herbage disappearance rate, and stocking rate of pastures. The experiment was conducted in a completely randomized design with three treatments, and four replications (paddocks) were used with twenty-one non-lactating crossbred dairy heifers. Treatments consisted of pastures of palisade grass without a N source (control), fertilized with urea (150 kg/ha/year fertilized), or mixed with pintoi peanut (mixed). Inclusion of the legume increased concentrations of fractions A (p = 0.009), which is the soluble N compound, and B3 (p < 0.001), which is slowly degraded true protein, compared with pastures fertilized with N and non-fertilized pastures. Nitrogen fertilization increased fraction B1 + B2 (p = 0.046), mainly true proteins, and decreased fraction C (p = 0.0007), indigestible protein, and neutral detergent fiber concentrations (p = 0.0003), contributing to increasing the nutritive value of the herbage. Additionally, N fertilization increased herbage mass (p = 0.004) and herbage allowance (p = 0.0001). Both N fertilization and biologically fixed N increased herbage allowance (p = 0.02) and accumulation rate (p = 0.02), as well as the crude protein content of herbage (p < 0.0001) compared with non-fertilized pastures. Nitrogen fertilization increased true protein and decreased indigestible protein of herbage and promoted a greater herbage mass production, while the inclusion of legumes increased soluble protein and decreased the slowly degraded true protein of herbage. Both N management strategies increased herbage allowance and accumulation rate. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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