Rate of Milk Secretion in Dairy Cattle in the Intervals between Consecutive Milkings

Bailey, George; Clough, P. A.; Dodd, F. H.

doi:10.1038/173404a0

Cited by 8 publications

(6 citation statements)

References 3 publications

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“…He suggested that after milking intervals of more than 12 h the rate of secretion in the succeeding interval may be depressed. This preceding interval effect has been demonstrated by Bailey et al (1955) and was mentioned by Elliott & Brumby (1955).…”

supporting

confidence: 70%

“…As a result the yield of milk obtained should be equivalent to the true amount secreted (cf. Bailey et al 1955).…”

Section: Resultsmentioning

confidence: 99%

“…He found that the carryover of residual fat was in direct proportion to the amount of milk in the udder before milking. This was confirmed by Bailey, Clough & Dodd (1954. Turner (1953Turner ( , 1955a has provided evidence that this is also true of residual milk.…”

mentioning

confidence: 79%

“…More recently direct measurements of the relationship between the quantity of milk secreted and the length of the milking interval have been made by Bailey et al (1954Bailey et al ( , 1955, Turner (19556) and Elliott & Brumby (1955). Bailey et al concluded that the relationship was curvilinear over a period of 18 h though the deviation from linearity was negligible up to 12 h. Turner, covering a much wider range of milking intervals, found that 'secretion would not be significantly affected by length of interval up to at least 16 h'.…”

mentioning

confidence: 99%

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Variations in the rate of milk secretion in milking intervals of 2–24 hours

Elliott¹,

Dodd²,

Brumby³

1960

Journal of Dairy Research

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The rates of secretion of milk, fat and solids-not-fat have been measured over milking intervals of 2-24 h in a series of experiments using thirty cows at various stages of lactation. To ensure that the results were not biased by a carryover of residual milk and fat the residual milk was removed after intravenous injections of 'Pitocin'. The biases that can be caused by previous interval effects and lactation trends were eliminated by the balanced Latin square design used.Milk and solids-not-fat secretion appeared to be linear with duration of milking interval up to 16 h, but with longer intervals there was, in some experiments, a decline in the rate of secretion. There was considerable variation between cows in the decline in secretion rate with increasing milking interval and part of this variation was associated with differences in milk yield. In all experiments fat secretion appeared to be almost linear with time over a 24 h period.After milking intervals of 20 and 24 h the rate of secretion of milk and solids-notfat, but not of fat, was depressed for at least 16 h. For many years it has been generally assumed that the rate of milk secretion into the udder progressively declines as milk accumulates in the udder and that this decline is appreciable even within the milking intervals that occur with twice-daily milking. This belief was based to a large extent on the experiment of Ragsdale, Turner & Brody (1924). It was also considered to be supported by the increase in milk yield that occurs when cows are milked three times a day rather than twice, as well as by the increases in yield believed to occur when cows are milked at equal rather than unequal milking intervals and also following more complete evacuation of the udder during milking. However, it is only possible to draw conclusions about the rate of milk secretion from the usual type of milk-yield data if it is assumed that the milk obtained at • Animal Health Trust Wellcome Research Fellow, 1956-58.

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supporting

confidence: 70%

“…As a result the yield of milk obtained should be equivalent to the true amount secreted (cf. Bailey et al 1955).…”

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 79%

mentioning

confidence: 99%

See 2 more Smart Citations

Variations in the rate of milk secretion in milking intervals of 2–24 hours

Elliott¹,

Dodd²,

Brumby³

1960

Journal of Dairy Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…They further suggest that, for practical farm recording purposes, rate of flow may be used satisfactorily instead of the more accurate peak flow measure ment and, if limited to a single observation, the optimum time 4 is between the 60th and 120th days of the first lactation. Dodd (1953), in one of many studies carried out at the National Institute for Research in Dairying in England on milk secretion, udder health and milking flow characteristics (Dodd and Foot, 1947, 1948, 1953Dodd and .Neave, 1951;Dodd et ai., 1957;Clough e_fc s al., 1953;Grossman et aJL., 1950;Baxter et al, 1950;Bailey et al, 1954Bailey et al, , 1955Bailey et al, 1953;Neave et al, 1950;Oliver et al,1956) presents data on milking rate of 141 cows recorded in 326 lactations. He found coefficients of variation among cows in the various measures of machine milking rate to fall usually within the range of 30 to 40 percent and within-cow variations to be of the order of 8 to 11 percent.…”

mentioning

confidence: 99%