Studies on udder evacuation in dairy cows

Johansson, Ivar; Korkman, N.; Nelson, Nils Joel

doi:10.1080/00015125209433244

Cited by 29 publications

(2 citation statements)

References 5 publications

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“…As shown by Bruckmaier et al (1994), milk needs to be continuously ejected during milking to get a good emptying of the udder. If milk ejection and/or udder emptying had been improved, a higher fat content of strip milk would have been expected, since it is well known that fat content in the milk increases during milking (Johansson et al 1952; Ontsouka et al 2003).…”

Section: Discussionmentioning

confidence: 99%

“…This effect seems to be independent of pulsation rate (Thomas et al 1991). It has also been shown that milk yield can be increased by increasing the pulsation ratio from 50:50 to 70:30 (Thomas et al 1991) or from 60:40 to 67:33 (Gleeson et al 2004), In the study by Thomas et al (1991), an increase in fat yield and 3·5% FCM was also found, indicating that the increase in milk yield may have been due to increased udder emptying, since fat content increases during milking (Johansson et al 1952; Ontsouka et al 2003).…”

mentioning

confidence: 99%

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The effect of pulsation ratio on teat condition, milk somatic cell count and productivity in dairy cows in automatic milking

Ferneborg

Svennersten-Sjaunja

2015

Journal of Dairy Research

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The pulsation ratio of a milking machine affects milk flow and milking time, and has also been reported to influence teat condition and milk somatic cell count (SCC). However, most studies comparing pulsation ratios have been performed on conventional cluster milking (whole-udder level), where effects such as deteriorated teat end condition and increased milk SCC are likely to be caused by over-milking on teats that are emptied faster than the other teats. When the teat cups are detached from each udder quarter separately which can be done in automatic milking systems (AMS), the risk of over-milking, especially in front teats, may be significantly reduced. This study investigated the effects of pulsation ratio on teat end condition, milk SCC, milk yield, milking time and milk flow in an automatic milking system where each udder quarter is milked separately. In total, 356 cows on five commercial farms were included in a split-udder design experiment comparing three pulsation ratios (60:40, 70:30 and 75:25) with the standard pulsation ratio (65:35) during 6 weeks. Pulsation rate was 60 cycles/min and vacuum level 46 kPa. The 70:30 and 75:25 ratios increased peak and average milk flow and the machine-on time was shorter with 75:25, while both peak and average milk flows were lower and machine-on time was longer with the 60:40 ratio. No negative effects on teat condition or milk SCC were observed with any of the pulsation ratios applied during the study. Thus it is possible that increased pulsation ratio can be used to increase milking efficiency in AMS where quarter milking is applied.

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Section: Discussionmentioning

confidence: 99%