Abstract
The efficiency of polyethylenoglicol (PEG) and Co-EDTA was evaluated on the estimate of the main parameters that characterize the liquid phase’s kinetics of Holstein x Zebu cows’ rumen. Significant differences were not observed (P>0,05) among the markers for estimates of ruminal volume (l), passage rate (l/h), retention time (h), outflow rate (l/h) and recycling rate (cycles/d). However, Co-EDTA was the most suitable marker and presented more stability than PEG did. When the spectrophotometry (Co-EDTA methodology of analysis) became impossible, the marker PEG can be a cheap alternative and it supplies satisfactory results, since, the meticulousness of the turbidimetric technique is respected.KEYWORDS: Co-EDTA, liquid phase, outflow rate, polyethylenoglicol, ruminal volume.
Highlights
Co-EDTA was the most suitable marker and presented more stability than PEG did
CoEDTA was evaluated on the estimate of the main parameters that characterize the liquid phase's kinetics
Apesar de a técnica de turbidimetria apresentar grande variação na leitura e induzir a erros, no presente estudo a estimativa do volume ruminal obtida com o PEG (102,55 litros) não diferiu (P>0,05) daquela obtida com o Co-EDTA (95,67 litros), ainda considerado o mais estável dos indicadores de fase líquida
Summary
Janaina Januário da Silva, Eloísa Oliveira Simões Saliba, Luiz Januário Magalhães Aroeira, Norberto Mário Rodriguéz e André Guimarães Maciel Silva. 1. Zootecnista, doutora pela Escola de Veterinária da UFMG. Professora do Departamento de Zootecnia da Escola de Veterinária da UFMG 3. Professor do Departamento de Zootecnia da Escola de Veterinária da UFMG 5. Doutorando em Zootecnia na Escola de Veterinária da UFMG. Neste estudo avaliou-se a eficiência do polietilenoglicol (PEG) e do Co-EDTA na estimativa dos principais parâmetros que caracterizam a cinética de fase líquida do rúmen em vacas Holandês x Zebu. Não foi observada diferença significativa (P>0,05) entre os dois indicadores para os parâmetros volume ruminal (l), taxa de passagem (l/h), tempo de retenção (h), taxa de fluxo (l/h) e taxa de reciclagem (ciclos/d). Entretanto, o Co-EDTA mostrou ser o indicador mais adequado, por apresentar maior estabilidade que o PEG. PALAVRAS-CHAVES: Co-EDTA, fase líquida, polietilenoglicol, taxa de passagem, volume ruminal
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