Effect of Feefing Protected Lipid on the Uptake of Precursors of Milk Fat by the Bovine Mammary Gland

Gooden, J. M.; Lascelles, A. K.

doi:10.1071/bi9731201

Cited by 44 publications

(11 citation statements)

References 8 publications

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“…The reduction in plasma concentration of βHBA as a result of oilseed supplementation might help to explain the lower plasma concentrations of short-chain fatty acids for ewes fed oilseed-supplemented diets relative to those fed CT (Table 5). Our results are in agreement with those of Gooden and Lascelles (1973), who found that feeding protected fat to dairy cows had no effect on mammary gland uptake of glucose and βHBA.…”

Section: Plasma Metabolitessupporting

confidence: 83%

Blood metabolites and fatty acid composition of milk and cheese from ewes fed oilseeds

Zhang¹,

Mustafa²,

Zhao³

2006

Can. J. Anim. Sci.

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X. 2006. Blood metabolites and fatty acid composition of milk and cheese from ewes fed oilseeds. Can. J. Anim. Sci. 86: 547-556. Sixteen lactating Dorset ewes were used in a completely randomized design to determine the effects of oilseed supplementation on milk yield and composition, blood metabolites, cheese yield and composition and fatty acid profile of milk and cheese. Four iso-nitrogenous diets were formulated: a control diet (CT) with no oilseed supplementation, a flaxseed supplemented diet (FS), a sunflower seed supplemented diet (SF), and a canola seed supplemented diet (CS). Oilseed-supplemented diets were formulated to contain 7% fatty acids. Feeding oilseeds had no effect on dry matter intake. Milk yield was similar for ewes fed CT, FS and SF and was higher (P < 0.05) than that of ewes fed CS. Ewes fed oilseed-supplemented diets produced milk with higher (P < 0.05) protein and total solid percentages than those fed CT. However, milk fat percentage was only higher (P < 0.05) in the milk of ewes fed FS and SF relative to those fed CT. Actual cheese yield was higher (P < 0.05) from milk of ewes fed oilseed-supplemented diets relative to those fed CT. However, cheese composition was not affected by dietary treatments. Plasma concentrations of fatty acids and cholesterol were increased (P < 0.05) while plasma concentration of β-hydroxybutyrate (βHBA) was decreased (P < 0.05) by oilseed supplementation. However, plasma concentrations of glucose and mammary extraction rate of plasma metabolites were not influenced by oilseed feeding. Oilseed supplementation increased (P < 0.05) concentrations of unsaturated fatty acids in milk fat. The order of increase was SF > FS > CS. Feeding SF, FS and CS increased (P < 0.05) conjugated linoleic acid (CLA) concentration in milk by 83.5, 39.2 and 16.5%, respectively. Concentration of linolenic acid in milk was only increased (P < 0.05) by feeding FS. Changes in milk fatty acid profiles were reflected in the cheese. Les auteurs ont recouru à seize brebis Dorset en lactation dans le cadre d'une expérience entièrement randomisée visant à préciser les conséquences d'un supplément d'oléagineux sur le rendement laitier et la composition du lait, sur les métabolites du sang, sur le rendement fromager ainsi que sur la composition et le profil des acides gras du lait et du fromage. À cette fin, ils ont préparé quatre rations iso-azotées : une ration témoin (RT) sans oléagineux, une ration enrichie de graines de lin (GL), une enrichie de graines de tournesol (GT) et une autre enrichie de graines de canola (GC). Les rations enrichies ont été formulées pour contenir 7 % d'acides gras. Les oléagineux n'ont aucune incidence sur l'ingestion de matière sèche. Les brebis nourries de RT, GL et GT avaient un rendement laitier analogue, plus élevé (P < 0,05) que celui des sujets recevant des GC. Les animaux engraissés avec une ration enrichie d'oléagineux ont donné un lait proportionnellement plus riche (P < 0,05) en protéines et en solides totaux que celui des brebis recevant la RT. Toute...

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Section: Plasma Metabolitessupporting

confidence: 83%

Blood metabolites and fatty acid composition of milk and cheese from ewes fed oilseeds

Zhang¹,

Mustafa²,

Zhao³

2006

Can. J. Anim. Sci.

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“…Although the present investigations showed that there were no dietary effects on the overall concentrations of the major plasma lipids at higher intakes of tallow and polyunsaturated fatty acid containing diets, increased concentrations of ruminant plasma lipids have been observed (21,(39)(40)(41). As a result of feeding diet B in the present experiment, the concentration of triglycerides within the VLDL fraction was considerably increased and there was a compensatory decrease in the proportion of cholesteryl esters.…”

Section: Discussioncontrasting

confidence: 70%

“…Thus, in the ruminant animal, it is generally accepted (42.43) that the provision of long chain fatty acids for milk fat production occurs predominantly through the triglycerides contained within the lipoproteins of density less than 1.006. Furthermore, it has been shown that the changes in the 18:2 concentrations within the milk fat which occurred as a result of feeding a "protected" PUFA diet could be accounted for specifically by the changes produced in the concentration and 18:2 content elicited within the triglycerides of the VLDL and chylomicron classes (39). Conversely, the failure of an unprotected PUFA diet to produce any effect on milk fat composition has in turn been associated with an inability to influence, for any length of time, the 18:2 concentration of this plasma lipoprotein fraction.…”

Section: Discussionmentioning

confidence: 99%

The effect of dietary fats on the plasma lipid composition of sheep

Noble

Vernon

Christie

et al. 1977

Lipids

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This study reports on the plasma lipid compositions of sheep fed either a control diet (C), a control diet supplemented with tallow (A) or polyunsaturated fatty acid (B) that had been protected against hydrolysis and hydrogenation in the rumen, or a control diet supplemented with maize oil (D). Diet B considerably increased the 18∶2 content of all the major plasma lipid fractions. Although the feeding of diet D also resulted in an increase in the 18∶2 contents within the cholesteryl ester, unesterified fatty acid, and phospholipid fractions the increases were considerably less than those observed with diet B; the levels of 18∶2 within the triglyceride fraction remained similar to that for the sheep which received the control diet. The effect of feeding diet A was confined solely to the triglyceride fraction where the concentrations of 16∶0 and 18∶1 were increased. The lipoproteins of the plasma were separated into very low density lipoproteins (d<1.006), low density lipoproteins (1.006

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“…About half of the fatty acids, restricted to the long chain fatty acids, are derived from blood plasma lipids of dietary origin and to a lesser extent from mobilisation of body lipid stores3132. This explains why milk fat composition can be highly variable depending on the diet and the nutritional status3334. Because all cows in this study shared the same genetic background and were farmed together, the observed differences in the fatty acid composition must have been generated by de novo fat synthesis in the mammary gland.…”

Section: Discussionmentioning

confidence: 94%

Increased gene dosage for β- and κ-casein in transgenic cattle improves milk composition through complex effects

Laible

Smolenski

Wheeler

et al. 2016

Sci Rep

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We have previously generated transgenic cattle with additional copies of bovine β- and κ casein genes. An initial characterisation of milk produced with a hormonally induced lactation from these transgenic cows showed an altered milk composition with elevated β-casein levels and twofold increased κ-casein content. Here we report the first in-depth characterisation of the composition of the enriched casein milk that was produced through a natural lactation. We have analyzed milk from the high expressing transgenic line TG3 for milk composition at early, peak, mid and late lactation. The introduction of additional β- and κ-casein genes resulted in the expected expression of the transgene derived proteins and an associated reduction in the size of the casein micelles. Expression of the transgenes was associated with complex changes in the expression levels of other milk proteins. Two other major milk components were affected, namely fat and micronutrients. In addition, the sialic acid content of the milk was increased. In contrast, the level of lactose remained unchanged. This novel milk with its substantially altered composition will provide insights into the regulatory processes synchronizing the synthesis and assembly of milk components, as well as production of potentially healthier milk with improved dairy processing characteristics.

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Effect of Feefing Protected Lipid on the Uptake of Precursors of Milk Fat by the Bovine Mammary Gland

Cited by 44 publications

References 8 publications

Blood metabolites and fatty acid composition of milk and cheese from ewes fed oilseeds

Blood metabolites and fatty acid composition of milk and cheese from ewes fed oilseeds

The effect of dietary fats on the plasma lipid composition of sheep

Increased gene dosage for β- and κ-casein in transgenic cattle improves milk composition through complex effects

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