Distribution of α- and γ-tocopherols within blood fractions of ruminants

Senaidy, Abdulrahman M. Al

doi:10.1016/0300-9629(96)00052-7

Cited by 9 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The uptake of plasma BC and VE by the mammary gland may depend on lipoprotein lipase activity, as reported for α-tocopherol in the rat (Martinez et al, 2002). This may explain the low extraction rate because only a minor part of these molecules are associated with very low density lipoproteins or chylomicrons in ruminants, in which transport in the blood of cattle has been reported to mainly occur via high-density lipoproteins and LDL for BC (Yang et al, 1992) and tocopherol (Al Senaidy, 1996). It should be pointed out that, although plasma and milk BC and VE concentrations were positively correlated (P < 0.0001), plasma concentration accounted for only 20 and 19% of variation in milk concentration of BC (residual standard error = 0.05) and VE (residual standard error = 0.29), respectively.…”

Section: Extraction Of Carotenoids and Vitamins From Plasma To Milkmentioning

confidence: 99%

Variations in Carotenoids, Fat-Soluble Micronutrients, and Color in Cows’ Plasma and Milk Following Changes in Forage and Feeding Level

Nozière

Grolier²,

Durand

et al. 2006

Journal of Dairy Science

View full text Add to dashboard Cite

The main aim of this work was to assess factors affecting the secretion of carotenoids in cows' milk. Our objectives were 1) to determine the kinetics of the decrease in carotenoids in plasma, milk, and adipose tissues following a switch from a high- to a low- carotenoid diet; and 2) to specify whether, during lipomobilization, the restitution of these compounds stored in the adipose tissues is sufficient to modify their secretion in milk. During the preexperimental period, 32 cows in midlactation were fed a grass silage-based diet, and were then assigned to 4 groups; 2 groups were maintained on the grass silage diet and 2 were switched to a late hay diet. For each forage diet, one group was fed according to net energy for lactation and nitrogen requirements, and the other was submitted to an energetic underfeeding, with similar forage and carotenoid intake between groups. Variations in concentration of carotenoids and color index (CI) of plasma and milk were monitored over 8 wk. Other components of nutritional interest; i.e., vitamin E (VE), vitamin A, and fatty acids, were also measured. The switch from grass silage to hay diet induced a rapid decrease in concentration of betal-carotene (BC) and VE and in the CI of plasma and milk during the first 2 wk. Pools of BC in adipose tissues also decreased by 40%. Concentrations of BC at the end of the experiment for silage and hay groups were 5.10 and 1.71 microg/mL in plasma and 0.17 and 0.07 microg/mL in milk, respectively. The energetic underfeeding did not affect BC concentration in plasma and induced a small increase in milk BC concentration, related to a decreased milk yield. In the silage group, the energetic underfeeding after 3 to 4 wk induced a decrease in CI and VE of plasma, but not of milk. The fatty acid profile in milk was modified by the change from grass silage to hay diet (C10 to C14 and linoleic acid increased; stearic and linolenic acid percentages decreased) and by underfeeding (oleic, vaccenic, and rumenic acid percentages increased). This study shows that BC and VE levels persist in midlactation cows' plasma and milk for about 2 wk. The results could not confirm a release of BC by bovine adipose tissue, but the level of underfeeding was moderate in this trial. The concentration of BC explained 58 and 40% of variation in CI of plasma and milk, respectively. These CI appear to be valuable tools for diet traceability (i.e., silage vs. hay).

show abstract

Section: Extraction Of Carotenoids and Vitamins From Plasma To Milkmentioning

confidence: 99%

Variations in Carotenoids, Fat-Soluble Micronutrients, and Color in Cows’ Plasma and Milk Following Changes in Forage and Feeding Level

Nozière

Grolier²,

Durand

et al. 2006

Journal of Dairy Science

View full text Add to dashboard Cite

show abstract

“…Cholesterol contents were slightly higher in LPF2 than LPF3 and the highest vitamin E concentration was found in LPF2. Vitamin E is reported by others to be circulating in the highest concentration in HDL in cattle or at least in even concentrations between LDL and HDL in ruminants (Herdt & Smith, 1996; Senaidy, 1996; Ametaj et al 2000). Hence it appears that satisfactory separation of plasma fractions was obtained.…”

Section: Discussionmentioning

confidence: 97%

25-hydroxyvitamin D circulates in different fractions of calf plasma if the parent compound is vitamin D₂or vitamin D₃, respectively

Hymøller

Jensen

2015

Journal of Dairy Research

View full text Add to dashboard Cite

Vitamin D has become one of the most discussed nutrients in human nutrition, which has led to an increased interest in milk as a vitamin D source. Problems related to fortifying milk with synthetic vitamin D can be avoided by securing a high content of natural vitamin D in the milk by supplying dairy cows with sufficient vitamin D. However, choosing the most efficient route and form of supplementation requires insight into how different vitamin D metabolites are transported in the body of cattle. There are two forms of vitamin D: vitamin D2 (D2) and vitamin D3 (D3). Vitamin D2 originates from fungi on roughage. Vitamin D3 originates either from endogenous synthesis in the skin or from feed supplements. Vitamin D2 is chemically different from, and less physiologically active than, D3. Endogenous and dietary D3 is chemically similar but dietary D3 is toxic, whereas endogenous D3 appears well regulated in the body.

show abstract

“…Plasma vitamin E is transported in association with lipoproteins (Lp) in ruminants (A1 Senaidy 1996), humans (McCormick et al 1960, Behrens et al 1982) and rats (Peake et al 1972. The HDL are the major plasma Lp (more than 80% of total Lp) in neonatal calves (Bauchart et al 1989, Forte et al 1981, Jenkins et al 1988) and adult ruminants (Raphael et al 1973).…”

Section: Introductionmentioning

confidence: 99%

Study of immune response and uptake of lipid-soluble vitamins by dairy cattle

Ametaj

View full text Add to dashboard Cite

This manuscript has been reproduced from the microfilm master. UMI films the text directly from the original or copy submitted. Thus, some thesis and dissertation copies are in typewriter face, while others may be from any type of computer printer.The quality of this reproduction is dependent upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment can adversely affect reproduction.In the unlikely event that the author did not send UMI a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion. (e.g., maps, drawings, charts) are reproduced by sectioning the original, beginning at the upper left-hand comer and continuing from left to right in equal sections with small overlaps. Each original is also photographed in one exposure and is included in reduced form at the back of the book. Oversize materials

show abstract

Distribution of α- and γ-tocopherols within blood fractions of ruminants

Cited by 9 publications

References 17 publications

Variations in Carotenoids, Fat-Soluble Micronutrients, and Color in Cows’ Plasma and Milk Following Changes in Forage and Feeding Level

Variations in Carotenoids, Fat-Soluble Micronutrients, and Color in Cows’ Plasma and Milk Following Changes in Forage and Feeding Level

25-hydroxyvitamin D circulates in different fractions of calf plasma if the parent compound is vitamin D₂or vitamin D₃, respectively

Study of immune response and uptake of lipid-soluble vitamins by dairy cattle

Contact Info

Product

Resources

About

Distribution of α- and γ-tocopherols within blood fractions of ruminants

Cited by 9 publications

References 17 publications

Variations in Carotenoids, Fat-Soluble Micronutrients, and Color in Cows’ Plasma and Milk Following Changes in Forage and Feeding Level

Variations in Carotenoids, Fat-Soluble Micronutrients, and Color in Cows’ Plasma and Milk Following Changes in Forage and Feeding Level

25-hydroxyvitamin D circulates in different fractions of calf plasma if the parent compound is vitamin D2or vitamin D3, respectively

Study of immune response and uptake of lipid-soluble vitamins by dairy cattle

Contact Info

Product

Resources

About

25-hydroxyvitamin D circulates in different fractions of calf plasma if the parent compound is vitamin D₂or vitamin D₃, respectively