Milk composition in relation to rumen metabolism

Rook, J. A. F.

doi:10.1079/pns19590031

Cited by 24 publications

(8 citation statements)

References 16 publications

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“…Low roughage diets, which cause a fall in the concentrations of acetate and ,8-hydroxybutyrate in blood, also cause a specific fall in the concentration of short-chain fatty acids in milk. The infusion of butyrate into the rumen of a normal cow causes the concentration of 8-hydroxybutyrate (but not of acetate) in blood to rise, and also the concentrations of these fatty acids in milk to rise (Rook, 1959 ;Storry & Rook, 1961). Again, when acetate is withheld from the fluid perfusing the excised gland of a goat, milk continues to be secreted in which only the fat concentration is reduced.…”

Section: Precursors I N Blood Of the Components Of Milk A N D Of The mentioning

confidence: 99%

A Quantitative Balance Between Substrates and Metabolic Products of the Mammary Gland

Barry

1964

Biological Reviews

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Summary 1. An attempt has been made to assess from published experiments, and largely for the goat, the principal compounds that are absorbed from the blood by the lactating mammary gland, the quantities of each that are absorbed during the formation of 100 ml. of milk, and the proportion of each of the major components of milk, and of the carbon dioxide expired by the gland, which is derived from each of the components of blood. 2. An assessment has first been made of which compounds of blood could, and which could not, be quantitatively significant metabolites of the gland. This has been done by calculating the maximum amount of each compound which would be available to the gland during the formation of 100 ml. of milk, from its concentration in blood together with the rate of blood flow through the gland. 3. For components of blood which could be quantitatively significant metabolites of the gland, it should be possible to discover whether or not they are absorbed in significant amounts by making arterio‐venous measurements. Those measurements which have been made are considered, and rough calculations have been made of the quantity of each compound which is absorbed from the blood of the goat during the formation of 100 ml. of milk. 4. From this information, and from the results of experiments with isotopic tracers, an attempt has then been made to assess the proportion of each of the major components of milk, and of the carbon dioxide expired by the lactating gland, which is derived from each of the components of blood. 5. It is realized that the calculations made in this article are approximate. In conclusion, possible improvements in technique are briefly considered which would enable a balance of this kind to be made accurately.

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Section: Precursors I N Blood Of the Components Of Milk A N D Of The mentioning

confidence: 99%

A Quantitative Balance Between Substrates and Metabolic Products of the Mammary Gland

Barry

1964

Biological Reviews

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“…The loose faeces may be associated with a reduction in the dry-matter output rather than an increase in water output. Rook & Balch (1959) showed that the decline in dry-matter content of faeces from 13 to 9y0, when cattle were changed from a diet of silage, hay and concentrates to one of young Cocksfoot herbage, was associated with an actual decline in faecal water output and an even greater fall in faecal drymatter output.…”

Section: Diarrhoea In the Ruminantmentioning

confidence: 99%

Diarrhoea of nutritional origin

Roy¹

1969

Proc. Nutr. Soc.

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“…In the lactating dairy cow, PAA concentrations have been shown to influence the synthesis of milk protein (97). The supply of propionate absorbed from thc rumen may thus control the overall degradation and synthesis of amino acids in the liver and, hence, the PAA level.…”

Section: Introductionmentioning

confidence: 99%

Chemical Factors and Their Relation to Feed Intake Regulation in Ruminants: A Review

Jones¹

1972

Can. J. Anim. Sci.

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The subject is reviewed with respect to the role of nutrient metabolism upon the regulation of ruminant feed intake. Chemical factors associated with changes in dietary or nutrient composition and their metabolism within the reticulorumen or animal body, or both, are emphasized. The importance of physical, physiological or metabolic, and sensory regulatory mechanisms are discussed in relation to their effects upon the formation of various metabolites known to be related to feeding. These include volatile fatty acids, amino acids, and blood glucose. Various tissues are discussed in relation to their relative importance for activation of a feedback signal associated with satiety. A general hypothesis is postulated for the integration of various factors, known to influence feed intake regulation, into a complex system.

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Milk composition in relation to rumen metabolism

Cited by 24 publications

References 16 publications

A Quantitative Balance Between Substrates and Metabolic Products of the Mammary Gland

A Quantitative Balance Between Substrates and Metabolic Products of the Mammary Gland

Diarrhoea of nutritional origin

Chemical Factors and Their Relation to Feed Intake Regulation in Ruminants: A Review

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