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Effect of omitting teat preparation on bacterial levels in bulk tank milk
Irish Journal of Agricultural and Food Research ( IF 1.5 ) Pub Date : 2016-12-01 , DOI: 10.1515/ijafr-2016-0017
David Gleeson , Paul Edwards , Bernadette O’Brien

Abstract The objective of this study was to investigate the effect of omitting teat preparation prior to milking on the bacterial levels in milk directly after milking and after a period of milk storage. Eighty Holstein–Friesian dairy cows were assigned to two pre-milking teat preparation treatments: (i) washing of teats and drawing of foremilk, followed by drying with paper towels and (ii) no teat preparation. Individual cow measurements included individual quarter somatic cell count (SCC) and teat swabs for the presence of Bacillus cereus sensu lato. On seven monthly occasions, all milk produced over a 24 h period from each treatment group was segregated into a separate tank and sampled. Sub-samples of this milk were stored at 4 °C for 0, 24, 48 and 72 h, and the milk was analysed for total bacterial count (TBC), thermoduric bacterial count and the presence of B. cereus s. I. Individual quarter SCCs were numerically higher for unprepared teats (159,000 cells/mL) compared with those for prepared teats (133,000 cells/mL; P < 0.09). A similar trend was observed for bulk tank SCC, with the unprepared teat treatment tending to have a higher SCC (155,857 cells/mL) compared to the prepared teat treatment (102,286 cells/mL; P< 0.09). The TBC was not significantly higher from unprepared teats (3,152 cfu/ mL) compared with milk from prepared teats (1,678 cfu/mL) (P< 0.10). Milk TBC was significantly higher after storage for 72 h compared with that after 0, 24 and 48 h (P< 0.01). The results of this study indicate that under good hygienic conditions in an outdoor grazing situation, the omission of pre-milking teat preparation has a minimal effect on TBC and SCC.

中文翻译:

省略乳头准备对散装罐牛奶中细菌水平的影响

摘要 本研究的目的是研究在挤奶前省略乳头准备对挤奶后和牛奶储存一段时间后牛奶中细菌水平的影响。80 头荷斯坦-弗里斯兰奶牛被分配进行两种挤奶前乳头准备处理:(i) 清洗乳头和吸取前奶,然后用纸巾擦干和 (ii) 不准备乳头。个别奶牛测量包括个别四分之一体细胞计数 (SCC) 和乳头拭子是否存在蜡样芽孢杆菌。在七个月的时间里,每个处理组在 24 小时内生产的所有牛奶都被隔离到一个单独的罐中并取样。这种牛奶的子样本在 4°C 下储存 0、24、48 和 72 小时,然后分析牛奶的总细菌计数 (TBC),耐热细菌计数和蜡状芽孢杆菌的存在。I. 与制备好的乳头(133,000 个细胞/mL;P < 0.09)相比,未制备乳头的单个四分之一 SCC 在数值上更高(159,000 个细胞/mL)。对于大罐 SCC,观察到类似的趋势,与准备好的乳头处理(102,286 个细胞/mL;P < 0.09)相比,未经处理的乳头处理往往具有更高的 SCC(155,857 个细胞/mL)。与来自制备乳头的牛奶 (1,678 cfu/mL) 相比,来自未制备乳头 (3,152 cfu/mL) 的 TBC 并未显着升高 (P < 0.10)。与储存 0、24 和 48 小时相比,储存 72 小时后的牛奶 TBC 显着升高(P < 0.01)。这项研究的结果表明,在户外放牧环境中,在良好的卫生条件下,
更新日期:2016-12-01
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