Effect of pre-stimulation on milk flow pattern and distribution of milk constituents at a quarter level
Tancin, V.,Slovenske Centrum Polnohospodarskeho Vyskumu, Nitra (Slovak Republic) | Uhrincat, M.,Slovenske Centrum Polnohospodarskeho Vyskumu, Nitra (Slovak Republic) | Macuhova, L.,Slovenske Centrum Polnohospodarskeho Vyskumu, Nitra (Slovak Republic) | Bruckmaier, R.M.,University of Bern (Switzerland). Veterinary Physiology
The aim of this study was to investigate milk flow patterns and milk composition in relation to pre-milking udder stimulation. The milk of one quarter of each of the sixteen cows was removed separately and divided into six fractions (P - cisternal milk during milking without stimulation and the first 300 mL during milking with pre-stimulation, 0-25%, 25-50%, 50-75%, 75-100%, 75-100%, MS-machine stripping) and into five portions (25%, 50%, 75%, 100%, 100% + MS) during milking. Two milkings were performed during two consecutive evening milkings with or without manual stimulation. Pre-stimulation resulted in a reduction of milking time, duration of the increase and decline phase of milk flow, stripping yield, but it increased the peak flow rate as compared with milking without pre-stimulation (P less than 0.05). In both fractions and portions the content of fat increased steadily during milking and reached a maximum at MS. Lactose increased from P to 50-75% and then it decreased to MS. Significantly higher fat contents at 25% and 50% portions and in both protein and dry matter at 25% portions were found during milking with pre-stimulation as compared with no stimulation (P less than 0.05). The content of fat, protein and dry matter were also higher in both P and 0-25% fractions for milking with pre-stimulation (P less than 0.05). Pre-stimulation positively influenced the parameters of milk flow and therefore the efficiency of milk removal and contributed to better distribution of components in milk fractions during milking.
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