Physicochemical composition and fatty acid profile of milk from F1 Holstein x Zebu cows fed with increasing concentrations of urea
| Autor: | José Reinaldo Mendes Ruas, Luciana Albuquerque Caldeira, Dante Pazzanese Duarte Lanna, Vanice Mendes de Souza, Ana Cássia Rodrigues de Aguiar, Criszoel Ferreira Souza, Ana Paula da Silva Antunes, Vicente Ribeiro Rocha Júnior |
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| Přispěvatelé: | UNIMONTES, EPAMIG, Universidade Estadual Paulista (UNESP) |
| Rok vydání: | 2015 |
| Předmět: |
Soybean meal
Composição físico-química Farelo de soja chemistry.chemical_compound fluids and secretions Animal science Latin square Casein Food science lcsh:Agriculture (General) Lactose Dairy cattle Physicochemical composition chemistry.chemical_classification Non-protein nitrogen food and beverages Fatty acid Zebu lcsh:S1-972 Nitrogênio não protéico chemistry Biochemistry Urea General Agricultural and Biological Sciences Somatic cell count |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP Semina: Ciências Agrárias, Vol 36, Iss 6Supl2, Pp 4435-4446 (2015) |
| ISSN: | 1679-0359 1676-546X |
| DOI: | 10.5433/1679-0359.2015v36n6sup2p4435 |
| Popis: | Made available in DSpace on 2022-04-28T19:02:26Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-01-01 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) We evaluated the physicochemical composition and fatty acid profile of milk from F1 Holstein × Zebu cows that were fed increasing levels of urea (0%, 33%, 66% and 100%, corresponding to 0%, 0.92%, 1.84% and 2.77% CP as NPN) as a substitute for soybean meal. Eight lactating F1 Holstein × Zebu cows producing an average of 10 kg of milk per day corrected to 3.5% fat, were placed in two 4 × 4 Latin squares (4 animals, 4 diets and 4 periods). Each experimental period lasted 18 days. Milk samples from each cow were collected from morning and afternoon milkings and analyzed for composition and fatty acid concentration. Milk urea nitrogen increased linearly (P < 0.05) with increasing dietary urea. Other variables including fat content, protein, fixed mineral residues, lactose, total nonfat solids, acidity, density, casein, cryoscopic index, somatic cell count, and milk fatty acid concentrations, were not affected by treatment. Thus, urea provides a viable alternative to soybean meal that does not affect the characteristics of milk from primiparous F1 Holstein × Zebu cows, producing up to 10 kg of milk corrected to 3.5% fat day-1. Programa de Pós-Graduação em Zootecnia Universidade Estadual de Montes Claros UNIMONTES Campus de Janaúba Dept. de Ciências Agrárias UNIMONTES Campus de Janaúba Empresa de Pesquisa Agropecuária de Minas Gerais EPAMIG Universidade Estadual de São Paulo ESALQ Campus Piracicaba Universidade Estadual de São Paulo ESALQ Campus Piracicaba |
| Databáze: | OpenAIRE |
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