efeito da temperatura e do tempo de armazenamento sobre a contagem de células somáticas no leite effects of temperature and storage on somatic cell counts in milk

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2005
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Abstract
Avaliou-se o efeito da temperatura e do tempo de armazenamento sobre a contagem de células somáticas(CCS). Amostras de leite de 21 vacas, coletadas e armazenadas às temperaturas de 5, 27, 32 e 36ºC e analisadas no 1º, 3º, 5º e 7º dia após coleta, foram classificadas em três grupos (células/ml): baixa (236.000±164.000), média (624.000±356.000) e alta CCS (1.320.000±945.000). O delineamento experimental foi o de parcelas subdivididas. As médias da CCS foram iguais (P>0,05) para amostras mantidas à temperatura de 5ºC e analisadas entre o primeiro e o sétimo dias após a coleta e para aquelas mantidas às temperaturas 5, 27, 32 e 36ºC e analisadas no primeiro dia. Médias diferentes (P<0,05) da CCS foram observadas para amostras mantidas a 27, 32 e 36°C a partir do 5°, 5° e 3° dias, respectivamente. Foram observados decréscimos de 57,6%, 58,5% e 27,9% nos valores iniciais da CCS nas amostras classificadas como baixa, média e alta, respectivamente. Os resultados mostram a necessidade de se encaminhar as amostras de leite para CCS sob refrigeração e de ser feita análise até sete dias após a coleta.
Effects of temperature and storage duration on somatic cell counts (SCC) of milk samples were studied in a split plot design with seven replicates. Samples from 21 cows were maintained at 5, 27, 32 or 36ºC (plots) and analyzed after 1, 3, 5 and 7 days of storage (split plots). Based upon an initial analysis, samples were classified into three groups: low (236,000±164,000), medium (624,000±356,000) and high (1,320,000±945,000) SCC/ml. No significant differences in SCC (P>0.05) were observed among storage temperatures for milk samples tested after one day of storage. For milk samples stored at 5°C, SCC averages did not significantly change (P>0.05) until the seventh day after collection. On days 5, 5 and 3, respectively, average SCC decreased for milk samples stored at 27, 32 and 36°C. Reductions of 57.6% (from 236,000 to 100,000), 58.5% (from 624,000 to 259,000) and 27.5% (from 1,320,000 to 952,000) from initial numbers of somatic cells were observed for samples classified as low, medium and high, respectively. Milk samples must be kept under refrigeration until analysis, and SCC must be measured within 7 days of sample collection.
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Authors ;G.N. Souza;M.R. Silva;F.S. Sobrinho;R.O. Coelho;M.A.V.P. Brito;J.R.F. Brito
Journal Environmental research
Year 2005
DOI
10.1590/S0102-09352005000600020
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352005000600020
Keywords
milk quality somatic cell count bovine mastitis storage temperature mastite bovina storage durationanimal culture

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