Grazing systems and supplementation effects on tropical forage-based dairy systems in the dry season
| Autor: | Alyce R. M. Santos, Daniel de Paula Sousa, Nelcino Francisco de Paula, Karine D.V. Camargo, Carlos Eduardo Avelino Cabral, Carla Heloisa Avelino Cabral, Bruna Gomes Macedo, Rayanne Viana Costa, Isabela E.B. Zanette, Perivaldo Carvalho |
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| Přispěvatelé: | Universidade Federal de Mato Grosso do Sul (UFMS), Universidade de São Paulo (USP), Universidade Estadual Paulista (Unesp), Univ Fed Rondonopolis |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Protein supplementation Irrigation Forage Biology 03 medical and health sciences chemistry.chemical_compound Rumen Animal science Nitrogen fertilization Latin square Lactation Grazing medicine Dairy cattle Nitrogen metabolism Lactose Nitrogen cycle General Veterinary 0402 animal and dairy science food and beverages 04 agricultural and veterinary sciences 040201 dairy & animal science 030104 developmental biology medicine.anatomical_structure chemistry Animal Science and Zoology |
| Zdroj: | Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2021-06-25T12:37:03Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-11-01 In dairy production systems, the use of strategies to increase production can be used, however some care must be taken to avoid the loss of nitrogen in the system, which is directly related to the environmental impacts. The aim with this study was to evaluate and the effect of the use of CP levels in concentrate in intensive systems on the productive performance and nitrogen metabolism of dairy cows in a tropical forage-based system. Sixteen multiparous Holstein-Zebu crossbreed cows in the middle and final third of lactation were used in a replicated 4 x 4 Latin square design with a 2 x 2 factorial arrangement of treatments design with 2 grazing systems (traditional and intensive) and 2 CP levels (18 and 22% CP) in concentrate. In intensive system, fertilization and irrigation were performed, while in traditional system, there was no fertilization and irrigation. Grazing systems affected all milk yield and composition variables, except for milk protein and solids. Greater milk yield was observed for cows in intensive system. Milk solids content was greater for cows supplemented with 18% CP level. Milk fat, protein, lactose, and solids yield was greater for cows in intensive system. Nitrogen use efficiency was greater for cows in traditional system. Milk N excreted was similar between supplemented cows, however, it was greater for cows in intensive system compared to cows in traditional system as well as 22% CP level. There was a grazing systems effect for ruminal ammonia nitrogen concentration with lesser values for cows in traditional system. The 22% CP level increased ruminal ammonia nitrogen. The results obtained in this study showed that cows in pastures under intensive system showed protein and energy imbalance in the rumen. The increase in CP levels does not affect the productive characteristics of these animals, only resulting in higher costs and higher N excretion to the environment. Univ Fed Mato Grosso, Fac Agron & Zootecnia, Cuiaba, MT, Brazil Univ Sao Paulo, Ctr Energia Nucl Agr, Lab Nutr Anim, Piracicaba, SP, Brazil Univ Estadual Paulista, Dept Zootecnia, Fac Ciencias Agr & Vet, Jaboticabal, SP, Brazil Univ Fed Rondonopolis, Inst Ciencias Agr & Tecnol, Rondonopolis, MT, Brazil Univ Estadual Paulista, Dept Zootecnia, Fac Ciencias Agr & Vet, Jaboticabal, SP, Brazil |
| Databáze: | OpenAIRE |
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