Perfil metabólico e emissão de metano em vacas leiteiras submetidas a sistemas de pastejo extensivo e intensivo
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Data
2015-07-31
Autores
Almeida, Leonardo Campos
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Universidade Federal do Espírito Santo
Resumo
The objective was to assess the feasibility of inte nsification of grassland in milk production systems, on productivity, metabolic status of animals, mitigation capacity in the emission of methane and the chemical composition of the forage. For this purpose we used 15 cows of Holstein and Holstein x Jersey , submitted at random to two treatments: intensive Panicum maximum cultivate Tanzania and extensive grazing of Brachiaria decumbens, Cynodon cultivate nlenfuensis. The average milk production was compared between treatments throughout lactation. The measur ement of methane was performed using the technique of internal tracer gas sulfur hexafluoride (SF6). In assessing the metabolic profile were determined components: energy, protein and minerals. And the emission of methane was correlated with the components of the energy profile. The components of the pastures were analyzed and quantified in chemical analysis. Comparing the average milk production, there were no statistical differences between the systems, contundo milk production per hectare was found value s of 46.6 and 228 liters / ha in extensive and intensive grazing, respectively. In analyzing the components of the metabolic profile was observed significant difference in cholesterol concentration between treatments, with higher values in animals irri gated system. The mineral components: magnesium, potassium, copper, iron and manganese forage, were statistically higher in the intensive system. The correlation between the emission of methane and the concentration of the components of the energy metaboli c profile of the animals was found a positive correlation between the values of ß - hydroxybutyrate and methane emission rate. It was found in chemical analysis statistically higher values in intensive system of variables: MS, MM (magnesium, potassium, c opper, iron and manganese) and NDIN. NDF and C were significantly higher in the extensive system. Higher serum levels of cholesterol and lower urea were found in animals of intensive grazing. Contacted negative correlation between calcium forage and serum magnesium animals. The correlation energy profile and methane emission (g / cow / day), positive correlation was found of ß - hydroxybutyrate with the emission. It completed this study that the intensification of the milk system was not able to influence sta tistically in the production of milk (cow / day) and methane emissions from animals. However the intensive system was competent to increase mineral concentrations of the herbage and the milk yield per hectare used. The intensive system also promoted increa sed plasma cholesterol concentrations.
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Palavras-chave
Chemical Analysis , Metabolic profile , Methane , Análise Bromatológica , Metano , Perfil metabólico