Fresh and ensiled forages as a source of estrogenic equol in bovine milk: a review

Kalač, Pavel

doi:10.17221/6859-cjas

Cited by 18 publications

(19 citation statements)

References 34 publications

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“…Feeding animals on forages with high isoflavone concentrations have desirable impact on quicker weight gain of lambs, as well as on cows' milk production [18,19]. A strong association between formononetin intake and equol concentration in plasma was demonstrated, so that cows' milk can be considered as a source of equol in human nutrition [20][21][22][23][24][25]. On the other hand, consumption of forages with high concentrations of formononetin and coumestrol has shown to cause temporary or permanent reproductive problems in some ruminants, mostly in sheep and cattle [26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Variation of Phytoestrogen Content and Major Agronomic Traits in Alfalfa (Medicago sativa L.) Populations

et al. 2020

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Alfalfa is the main perennial legume and a rich source of phytoestrogens. Variation of phytoestrogen content and agronomic traits was evaluated in twenty alfalfa populations over two consecutive years. The most dominant phytoestrogen in alfalfa populations was genistein, while slightly lower levels were found for kaempferol and coumestrol. Several populations (Af 1, 12, 18, 19, 20) showed superior agronomic performance, especially high forage yield (up to 71.93 t ha−1). These populations were also characterized by a lower (Af 1, 12, 18, 20) or high (Af 1, 19) content of total and individual phytoestrogens, including Af 8 population with the highest total content (2637.10 μg g-1 of DM) and content of most of the individual phytoestrogens and favorable agronomic properties. Ward hierarchical clustering method grouped the twenty evaluated populations into four distinct clusters. Identified materials provide a valuable source of germplasm for further breeding programs in order to develop new high-yielding cultivars with either low (for forage use) or high (for possible pharmaceuticals/nutraceuticals industries) phytoestrogen content.

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Section: Introductionmentioning

confidence: 99%

Variation of Phytoestrogen Content and Major Agronomic Traits in Alfalfa (Medicago sativa L.) Populations

et al. 2020

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“…The highest concentrations are found in plants of the Fabaceae family, such as soybean ( Glycine max L.) and clover ( Trifolium pratense L.) (Ko 2014 ; Mostrom and Evans 2012 ). In plants, isoflavones are usually found in conjugated forms as glucosides, acetylglucosides, and malonylglucosides (Kalač 2013 ; Mostrom and Evans 2012 ). When ingested by cows, isoflavones appear to be metabolized mainly in the rumen, and the main route of excretion is through feces and urine, with only a small proportion being excreted in milk (Njåstad et al 2014 ).…”

Section: Introductionmentioning

confidence: 99%

“…1 . Biochanin A (BA) is demethylated mainly into genistein (GE) and via a ring cleavage into para -ethyl phenol (a compound that apparently has no estrogenic activity) and organic acids (Njåstad et al 2014 ; Kalač 2013 ; Mostrom and Evans 2012 ). Formononetin (FO) is demethylated into daidzein (DA) and then reduced via hydrogenation and ring scission to equol (EQ) (a microbial metabolite of isoflavone with high estrogenic activity).…”

Section: Introductionmentioning

confidence: 99%

Analytical methods used to quantify isoflavones in cow’s milk: a review

Daems

Romnee

Heuskin

et al. 2016

Dairy Sci. & Technol.

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This paper provides an update and comprehensive review of the analytical methods used for quantifying isoflavones and their metabolites in cow’s milk. Isoflavones are secondary plant metabolites that are similar to 17 β-estradiol in chemical structure. They form one of the most common categories of phytoestrogens. Numerous health benefits have been attributed to isoflavones, but many of these compounds are also considered to be endocrine disruptors, with adverse effects on health. These contradictory trends offer an attractive prospect for future research, and therefore, sensitive and reliable analytical methods are required to clarify various issues about isoflavones. For this review, a structured methodology was used to select 26 relevant articles published between 2005 and 2015 from the Scopus and CAB Abstract databases. The review discusses individual steps of the analytical procedures described in these articles, including sample preparation, instrumental analysis and validation. The most commonly used analytical procedure is sample preparation involving liquid-liquid extraction and an enzymatic hydrolysis step followed by liquid chromatography with mass spectrometry analysis. Currently, however, there is no standardized procedure for the sample preparation and analysis of isoflavones in milk.

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“…Phytoestrogens represent a family of plant compounds showing both estrogenic and antiestrogenic properties. They may potentially confer health benefits related to cardiovascular diseases or cancer (particularly of breast and prostate) (Kalac 2013). Free-range systems of chicken rearing are based on a slowly-(or medium-to slowly-) growing vital chicken genotype with a resistance to diseases and that is well-adapted to rearing outside of a hall.…”

Section: Introductionmentioning

confidence: 99%

A mobile system for rearing meat chickens on pasture

Skřivan¹,

Pickinpaugh²,

Pavlů³

et al. 2015

CZECH J ANIM SCI

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ABSTRACT:The effect of grazing on the productive performance and meat quality was evaluated for chickens (Ross 308, n = 192). Chickens were kept in two pens on wooden shavings (2 × 96) from one day of age. On day 23 of age, one group was moved to a pasture and kept in a portable floorless pen with an area of 0.11 m 2 per chicken. The field portion of the experiment was conducted from the 1 st till the 18 th of June 2013. A control group was kept in the original pen until the end of the experiment at 6 weeks of age. Both groups were fed the same pelleted feed ad libitum. For the pasture-reared group, the moveable shelter was moved twice daily around the pasture with a predominance of grass species. The herbage intake of chickens was indirectly assessed by compressed sward height measurement after each cage movement, which employed a rising plate-meter. In the pasture, chickens preferred grass over clover. There was no significant effect of grazing observed on chicken body weight. The mortality of chickens in the grazing group was lower than that in the control group. Pasture treatment improved meat flavour by 9% (P = 0.014), produced breast meat with significantly higher (P = 0.009) redness, and almost doubled the concentration of α-tocopherol (P < 0.001). There were no significant effects of grazing on the dry matter, fat, cholesterol or pH of the meat. The production of TBARS in the breast meat of the pasture group after storage at 4°C for 5 days was lower (P = 0.013) than that in the breast meat of the control chickens. Although the differences between K, Ca, P, Mg, and N concentrations in pasture and soil before and after grazing reached 20%, these differences were not significant.

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Fresh and ensiled forages as a source of estrogenic equol in bovine milk: a review

Cited by 18 publications

References 34 publications

Variation of Phytoestrogen Content and Major Agronomic Traits in Alfalfa (Medicago sativa L.) Populations

Variation of Phytoestrogen Content and Major Agronomic Traits in Alfalfa (Medicago sativa L.) Populations

Analytical methods used to quantify isoflavones in cow’s milk: a review

A mobile system for rearing meat chickens on pasture

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