Vitamin E and Linolenic Acid Content of Hay as Related to Different Drying Conditions

Thafvelin, B.; Oksanen, H. E.

doi:10.3168/jds.s0022-0302(66)87850-5

Cited by 29 publications

(16 citation statements)

References 7 publications

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“…The fact that vitamin E directly reacts with several free radicals (Machlin and Bendich, 1987), could be a likely explanation for its decrease in summer, when an increase in Table 3 The effect of season (spring and summer) and feeding regimen (P ¼ pasture, PC ¼ pasture þ 500 g per head per day of concentrate, HC ¼ hay þ500 g per head per day of concentrate) on some markers † of oxidative status of lactating goats ROMs concentration was observed; this observation is supported by the negative correlation observed between ROMs and a-tocopherol concentrations (r ¼ 20·58; P , 0·031). The reduction in plasma a-tocopherol, between spring and summer, could also be ascribed to its reduction with the ageing of the plant (Thafvelin and Oksanen, 1966;Munne-Bosch and Penuelas, 2003). Plasma albumin concentration was significantly reduced in summer.…”

Section: Discussionmentioning

confidence: 98%

The effect of hot season and nutrition on the oxidative status and metabolic profile in dairy goats during mid lactation

et al. 2006

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The aim of this study was to evaluate the effects of the hot season and nutrition on the oxidative status and metabolic\ud profile of lactating goats during mid lactation. Twenty-four Red Syrian goats were allocated into three groups that were\ud offered the following diets: natural pasture (P), pasture þ 500 g/h per day of concentrate (PC) and hay plus 500 g/h per\ud day of concentrate (HC). Blood samples were taken in spring (85 ^ 7 days in milk (DIM)) and summer (120 ^ 7 DIM)\ud and assayed for reactive oxygen metabolites (ROMs), a-tocopherol, glucose, triglycerides, cholesterol, non-esterified\ud fatty acids, total protein, albumin and globulin concentrations and glutathione peroxidase (GHS-Px) and superoxide\ud dismutase (SOD) activities. Milk yield and milk composition were also measured. SOD, GSH-Px and ROMs levels\ud increased during summer when temperature humidity index values were high. The increase in ROMs in the PC and HC\ud groups could be ascribed to the improved nutritional regime and to their higher production level. The markers of the\ud oxidative status and of the metabolic profile measured in this study indicate that goats may have experienced moderate\ud oxidative stress. It seems that, seasonal rather than nutritional factors have a more pronounced effect on oxidative\ud status markers. Concentrate supplementation sustained milk yield and may represent a useful means to extend the\ud lactation period in dairy goats during late spring and summer

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Section: Discussionmentioning

confidence: 98%

The effect of hot season and nutrition on the oxidative status and metabolic profile in dairy goats during mid lactation

et al. 2006

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“…Indeed, differences might vary due to e.g. stage of maturity at the time of cutting as mature plants have lower leaf:stem ratio than young plants and leaves contain higher levels of α‐tocopherol than stems (Thafvelin and Oksanen, 1966; McDowell et al., 1996; Müller et al., 2007). For logistic reasons, forages of the second experiment were cut in October, which does not reflect the composition of forages cut by farmers earlier in the season.…”

Section: Discussionmentioning

confidence: 99%

Monitoring of vitamin E status of dry, early and mid-late lactating organic dairy cows fed conserved roughages during the indoor period and factors influencing forage vitamin E levels

Beeckman

Vicca²,

Ranst³

et al. 2010

Journal of Animal Physiology and Animal Nutrition

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Analysis of blood plasma of 60 cows selected on six Flemish organic dairy farms revealed that on average 12% of all samples and on one farm up to 28% of the organic cows showed plasma vitamin E concentrations less than 3.0 μg/ml, which is considered the minimum level to avoid health risks due to vitamin E shortages. Furthermore, this study showed early lactating and dry cows to be more at risk in relation to animals in mid-late lactation. In European organic farming, vitamin supplements are only allowed if granted by the local authority to satisfy daily requirements. Therefore, the vitamin E content of the feedstuffs used on the farms was determined. Grass clover silage (GCS) and mixed silage had significantly more vitamin E than hay, maize or grain (p < 0.05) [mean (SD): 52 (35), 29 (20), 4.5 (1.7), 4.9 (4.4) and 7.1 (3.8) mg/kg DM, respectively]. Apparently, variation in the vitamin E content in the silage samples was huge. Hence, the vitamin E content of ryegrass, white and red clover was determined in a second lab scale experiment and the effects of wilting, DM content and supplementation of ensiling additives were investigated. Fresh ryegrass had a higher vitamin E content than white and red clover (p < 0.05) [156 (11.3), 49.3 (0.67) and 74.3 (5.73) μg/g DM, respectively]. These differences remained after the wilting or ensiling. Supplementation of formic acid or lactic acid bacteria at ensiling had no significant effect on the vitamin E content. Overall, it can be concluded that GCS is the most important source of vitamin E in organic dairy farming. A legal possibility for case-related supplementation should be retained in organic dairy farming as approximately 18% of all dry and early lactating cows were at risk of vitamin E shortage.

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“…This might indicate that low TBA values corresponding to the induction period of TBA were due to E vitamers' protective effects. TBA value or peroxide values have been low when decomposition rate of E vitamers or antioxidants was high (Thafvelin and Oksanen, 1966). Artz and Rao (1991) reported that corn starchsoybean oil extruded at 115 and 135ЊC showed no significant difference in peroxide values during 16 days of storage.…”

Section: Changes Of Vitamers and Oryzanol In Extruded Rice Bran Durinmentioning

confidence: 99%

Hydrolytic Stability and Changes in E Vitamers and Oryzanol of Extruded Rice Bran During Storage

Shin

Godber

Martin

et al. 1997

Journal of Food Science

136

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Rice bran was extruded at 110, 120, 130, and 140ЊC with post extrusion holding times of 0, 3, and 6 min and stored at ambient temperatures for 1 yr. Holding time had no effect (pϾ0.05) on hydrolytic stability whereas 110ЊC was slightly less effective in maintaining hydrolytic stability. Increased holding times reduced (pϽ0.05) total vitamin E content. Oryzanol concentration was lower (pϽ0.05) only after 6 min holding time. Oryzanol was relatively more stable to extrusion temperatures than vitamin E. The highest retentions of total vitamin E and oryzanol were found in raw rice bran during storage. Increased extrusion temperatures reduced the retention of vitamin E and oryzanol during storage.

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Vitamin E and Linolenic Acid Content of Hay as Related to Different Drying Conditions

Cited by 29 publications

References 7 publications

The effect of hot season and nutrition on the oxidative status and metabolic profile in dairy goats during mid lactation

The effect of hot season and nutrition on the oxidative status and metabolic profile in dairy goats during mid lactation

Monitoring of vitamin E status of dry, early and mid-late lactating organic dairy cows fed conserved roughages during the indoor period and factors influencing forage vitamin E levels

Hydrolytic Stability and Changes in E Vitamers and Oryzanol of Extruded Rice Bran During Storage

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