The Variation in the Composition of Milk During Successive Stages of Milk Removal from the Mammary Gland of the Cow

Mackenzie, D. D. S.; Lascelles, A. K.

doi:10.1071/bi9650379

Cited by 12 publications

(8 citation statements)

References 4 publications

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“…The possible effect of oxytocin on the composition of the milk secreted was discussed by Mackenzie and Lascelles (1965). It is not possible from the present data to attribute any specific effect of oxytocin on milk secretion.…”

Section: Discussionmentioning

confidence: 46%

“…Some water absorption probably occurred from the high sodium chloride solutions either as a result of the further lowering of the osmotic pressure by the absorption of sodium chloride or as a result of a closer link between the absorption of water and that of sodium. The failure to demonstrate significant absorption of water was unexpected since normal milk is isotonic with blood (Jenness and Patton 1959) and the results of the experiments by Mackenzie and Lascelles (1965) had indicated that the absorption of water from alveolar milk occurred as it passed through the ducts and cisterns.…”

Section: Discussionmentioning

confidence: 99%

“…Sodium, potassium, chloride, and lactose were determined as previously described by Mackenzie and Lascelles (1965). It was not possible to estimate chloride in the presence ofT~1824.…”

Section: (D) Estimation Of Fluid Volumementioning

confidence: 99%

“…Experiments have been described previously in which the composition of milk was determined in samples obtained from cows during the milking period and following successive injections of oxytocin (Mackenzie and Lascelles 1965). The concentration of sodium and chloride in whey increased with successive samples while the concentration of lactose in whey, and protein in skim milk decreased.…”

Section: Introductionmentioning

confidence: 99%

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The Movement of Solutes Across the Epithelium of the Ducts and Cisterns in the Mammary Gland of the Ewe

Mackenzie¹,

Lascelles²

1965

Aust. Jnl. Of Bio. Sci.

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SummaryThe role of the cisterns and large ducts in the overall process of milk secretion has been studied in experiments which have been carried out to determine the change in composition of solutions injected into the mammary gland cisterns of lactating and dry ewes. These solutions contained electrolytes, lactose, and a marker substance and were allowed to remain in the gland for periods of up to 4 hr. The concentration of sodium, potassium, chloride, and lactose in the solution injected into lactating glands approached with time that in milk. The data indicated that the rate of change in concentration of sodium, potassium, and chloride was more rapid than could be accounted for by the mixing of the injected solution with milk from the ducts. Sodium, potassium, and chloride ions were secreted into solutions in which the concentrations of these ions were lower than those in milk and sodium and chloride ions were absorbed from solutions in which their concentration was higher than that in milk. Water absorption occurred from the solutions containing sodium and chloride ata higher concentration than that in milk. In the dry gland the composition of the solutions injected approached with time that of involution secretion which has a higher sodium and chloride and lower potassium and lactose concentration than normal milk. Lactose was absorbed from dry glands but not from the lactating glands.

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Section: Discussionmentioning

confidence: 46%

Section: Discussionmentioning

confidence: 99%

“…Sodium, potassium, chloride, and lactose were determined as previously described by Mackenzie and Lascelles (1965). It was not possible to estimate chloride in the presence ofT~1824.…”

Section: (D) Estimation Of Fluid Volumementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Movement of Solutes Across the Epithelium of the Ducts and Cisterns in the Mammary Gland of the Ewe

Mackenzie¹,

Lascelles²

1965

Aust. Jnl. Of Bio. Sci.

Self Cite

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show abstract

“…In estimating the rate of secretion of milk, bias due to residual carry-over can be eliminated by removing the residual milk following injection of oxytocin at the end of the normal milking procedure so as to obtain a second ejection of milk. A limitation of this method is that the administered oxytocin may affect the rate of secretion of milk (Morag, 1968) or its composition (Mackenzie & Lascelles, 1965;Wheelock, Rook & Dodd, 1965a). However, Linzell (1967) considers that these results may be due to the high doses of oxytocin used since he found that in goats the composition of the milk was not affected by lower doses.…”

mentioning

confidence: 90%