![\"\"](\"https:\/\/veterinarska-stanica-journal.hr\/wp-content\/uploads\/2024\/09\/DrazenDURICIC.jpg\")
<\/p>\n<\/p>\n
D. \u0110uri\u010di\u0107<\/strong> and M. Sabli\u0107<\/strong>*<\/p>\n <\/a><\/p>\n <\/a> ▲<\/a><\/p>\n Silymarin is a mixture of flavonolignan fractions from the medicinal plant milk thistle, which is primarily used as a hepatoprotector in humans and animals, and acts as an antioxidant, anti-inflammatory, antifibrotic, and antiapoptotic agent. As a dietary supplement, it is increasingly used to treat various liver diseases, some intoxications, prevent side effects of chemotherapy and protect the kidneys in dogs, birds, poultry, rabbits, cats, horses and other animals. The use of silymarin in dairy cows showed an improved biochemical profile of cows, reduced occurrence of ketosis and increased milk production. In pigs, nutrient digestibility, total average daily feed intake, and average daily weight gain improved, while in sport horses, silymarin supplementation accelerated the return of cortisol levels to pre-exercise levels. Lipidosis of the liver or fatty liver disease is a common disorder among captive parrots. After long-term administration of 100\u2013150 mg\/kg silymarin in food every 8\u201312 hours, the health condition improved significantly according to the testimonies of parrot owners and veterinarians. In intensive poultry production systems, silymarin is used in broilers as a hepatotonic, to improve carcass characteristics, to boost the immune system and intestinal health, and as a growth promoter, and in laying hens to improve egg quality. In addition, it mitigated the negative effects of mycotoxins in broilers, chickens and Japanese quails. Although numerous studies are known about the effect of milk thistle and silymarin, their use on animals is not yet widespread.<\/p>\n Key words:<\/strong> application; exotic birds; domestic animals; milk thistle; pets; silymarin<\/em><\/p><\/blockquote>\n <\/a> ▲<\/a><\/p>\n Milk thistle (Silybum marianum<\/em>, L. Gaertn.) is a member of the Asteraceae<\/em> (Compositae<\/em>) family, which includes the daisies, artichokes, sunflowers, thistles, etc. The plant was named for the milky veins on the broad and toothed leaves. The flower has a large purple flower head. Although milk thistle is one of the oldest and thoroughly researched medicinal plants in the treatment of liver diseases (Radko and Cybulski, 2007), Dioscorides (a Greek physician and botanist) originally used it in the first century AD as a medicine for snake bites, while in the sixteenth century it was used to treat jaundice and gallstones (Bauer Petrovska, 2012).<\/p>\n Fruits and seeds of milk thistle contain: 1.3-3% of flavonolignans (silibinin and isosilibinin, silicristin and silidianin), flavonoids (flavones: apigenin, chrysoeriol, eriodictyol, and flavonols: taxifolin, kaempferol, quercetin), 20-30% fatty oils (linoleic and oleic acids, palmitic, linolenic, behenic and others), 0.2-0.6% phytosterols (\u03b2-sitosterol), and other compounds (British Herbal Compendium, 2006; EMA, 2018). The active extract from dried fruits and seeds of milk thistle is silymarin, which has exceptional antioxidant, hepatoprotective, anti-inflammatory, immunomodulating, antidiabetic, antiapoptotic, and anti-amyloidogenic properties that have been proven in extensive clinical trials (Vargas-Mendoza et al<\/em>., 2014; Surai, 2015; Saeed et al<\/em>., 2017; Haddadi et al<\/em>., 2020; Xiao et al<\/em>., 2024). Silymarin is a mixture of flavonolignans such as silibinin or silybin (A and B), isosilibinin or isosilybin (A and B), silychristin, silydianin, taxifolin (small amount) and other polyphenolic compounds (Haddadi et al<\/em>., 2020; Ranjan and Gautam, 2023; Jaffar et al<\/em>., 2024). Milk thistle and its derivatives are classified as neutraceuticals, a term that denotes the pharmaceutical effect of a compound or food product for which there is no scientifically confirmed or approved clinical benefit. Today, there is more evidence that the active ingredient silymarin has benefits for a variety of liver and gallbladder disorders in humans and as a medicine for animals.<\/p>\n <\/a> ▲<\/a><\/p>\n After an oral dose, the absorption of silibinin is low, as only 20-50% of crude silymarin extract is absorbed in the digestive tract (Fraschini et al<\/em>., 2002). The lipophilic structure facilitates absorption in the digestive tract after dissolution in lipid-rich environments. Limited solubility in water affects its bioavailability since water is the primary medium for nutrient absorption. To improve its bioavailability, new formulations obtained by the technique of micronisation and complexation of phospholipids are used (Mihailovi\u0107 et al<\/em>., 2023). A special combination of silymarin is administered orally in the form of capsules with a standard extract containing 70-80% silymarin. Silibinin (the main constituent of silymarin) takes 2-4 hours to reach its peak plasma concentration after consumption, with a plasma half-life of 6-8 hours (Zhu et al<\/em>., 2013). All components of silymarin are absorbed into liver cells via the digestive tract, and undergo biotransformation processes (Tighe et al<\/em>., 2020). Silibinin must be metabolised to be removed from the body through bile and faeces. About 80% of silibinin is eliminated as a water-soluble glucuronide and sulfate conjugate via bile, while 20\u201340% of bile containing silibinin conjugates is reabsorbed in the enterohepatic circulation. The acute toxicity of silymarin is very low, and was studied after IV administration in mice and rats (385-400 mg\/kg bw), rabbits and dogs (LD50 140 mg\/kg bw). <\/a> ▲<\/a><\/p>\n Silymarin protects liver cells by significantly reducing oxidative stress, capturing free radicals, slowing or preventing fibrogenesis, stimulating the transcription of RNA polymerase I and rRNA enzymes, inhibiting the catalytic activity of cytochrome P450 isoenzymes, and inhibiting membrane transport proteins. It protects healthy liver cells and those that have not yet been permanently damaged by significantly reducing oxidative stress, thereby mitigating cytotoxicity (Jaffar et al<\/em>., 2024). Extracts of many medicinal plants show inhibitory effects on the growth and proliferation of tumours, such as the extract of the plant Santolina chamaecyparissus<\/em> L. reduced the frequency, size and number of breast cancer tumours in Wistar rats (Azevedo et al<\/em>., 2024). Another example is the extract of Cytinus hypocistis<\/em> (L.) subspecies macranthus<\/em>, which had an antiproliferative effect on the development of human papillomavirus 16 in mice (Medeiros et al<\/em>., 2023). Anticarcinogenic effects as well as the potential to reduce the growth of malignant formations have fasting without malnutrition associated with the hepatoprotective action of silymarin, which inhibits glycolysis, reduces glucose levels and induces external apoptosis and significantly slows the growth of hepatocellular carcinoma (Xiao et al<\/em>., 2024). Numerous studies are known about the antitumour effects of silymarin in humans and animals (Agarwal et al<\/em>., 2006; Forghani et al<\/em>., 2014; Belli et al<\/em>., 2017; Won et al<\/em>., 2018). In addition, there is the potential of using silymarin in neurological and neurodegenerative disorders in humans due to its bioavailability in the brain and the application of nanotechnology (Ranjan and Gautam, 2023).<\/p>\n Side effects when using silymarin are rare, recorded in humans as nausea, vomiting, diarrhoea and skin allergies (Khazaei et al<\/em>., 2022). In dogs, in a case of overdose with doses greater than 1.5 grams per day, it can cause diarrhoea due to increased bile flow. Due to the content of 0.2-0.6% phytosterols (\u03b2-sitosterol), certain unpurified preparations of milk thistle can affect the level of oestrogen, so such preparations should be used with caution in animals with hormonal disorders (Radko and Cybulski, 2007).<\/p>\n <\/a> ▲<\/a><\/p>\n Disorders such as hepatic lipidosis or fatty liver disease are highly prevalent in captive psittacines. In practice, there are many testimonies of veterinarians and parrot owners, who noticed that the health of their pets improved significantly by introducing milk thistle into their diet after diagnosing liver lipidosis or fatty liver disease. Along with the treatment of fatty liver disease, supportive therapy and a change in diet, weight reduction of the affected bird is required. During and after the disease, milk thistle is increasingly used as a medicine for the treatment and prevention of recurrence and for the well-being of animals affected by these metabolic disorders and diseases. Milk thistle has been reported to have very low toxicity in most wild and domestic animals and humans. Suggested doses of silymarin in birds range from 50-250 mg\/day depending on the purity and composition of various milk thistle products for human or animal use on the market. According to Carpenter, (2018), the dose for birds is 100-150 mg\/kg every 8-12 hours. In intensive poultry production systems, silymarin can be used in broilers as a growth promoter, and in laying hens to improve the quantity and quality of eggs. <\/a> ▲<\/a><\/p>\n In dairy cows, during the transition period and early lactation, metabolic disorders such as lipomobilisation syndrome, fatty liver and ketosis can occur. As the body tries to reduce the negative energy imbalance through the mobilisation of fat, a metabolic disorder often occurs that leads to the development of a fatty liver (Pe\u0161a et al<\/em>., 2016). The consequences of peripartum fatty liver can be alleviated by the use of silymarin. The number of cows with ketonuria decreased, the amount of milk increased by 3.4-7.7% and the biochemical profile improved in cows that received silymarin in a dose of only 10 g per day per cow (Tedesco et al<\/em> 2004; Vojtisek et al<\/em>., 1991).<\/p>\n The dietary supplement of 0.10% micelle silymarin in concentrate for pigs improved the overall average daily feed intake and average daily gain, enhanced the digestibility of dry matter nutrients and nitrogen, and had a positive effect on the gut microbiome (increased number of lactobacilli and reduced number of E. coli<\/em>) in pigs during the fattening period (Hossain et al<\/em>., 2024). Grela et al<\/em>. (2020) showed that the finishing diet of pigs with 3% milk thistle seeds improved body growth, and Zhang and Kim (2022) showed that micelle silymarin supplementation up to 0.2% improved body weight gain in finishing pigs. In sport horses, administration of silymarin accelerated the return of cortisol to resting values \u200b\u200bbefore exercise (Dockalova et al<\/em>., 2021; Tedesco and Guerrini, 2023).<\/p>\n <\/a> ▲<\/a><\/p>\n Milk thistle nutritional supplements for dogs and cats are available in three formulations as powder, capsules and liquids. The most commonly used formulation for dogs are chewable capsules, and they are classified as a dietary supplement. Various preparations of silymarin for dogs can be obtained on different markets, such as Denamarin, Hepatosupport, Hepatoprotect, Milk Thistle, Silymarin Advanced, Hepatoforce, BARF Silybum Marianum, and many others (Gogulski et al<\/em>., 2020; Marchegiani et al<\/em>., 2020). The active ingredient, silymarin, is extracted from the plant, so milk thistle medications approved for human use can be used in appropriate doses in dogs and cats. In dogs and cats, treatment with silymarin is aimed at acute and chronic liver diseases, in the detoxification process and supportive treatment in chemotherapy (Gogulski et al<\/em>., 2021; Tedesco and Guerrini, 2023). The recommended dose of silymarin for dogs and cats is 20-50 mg\/kg\/day, i.e.<\/em>, for the preparation Nutramax which contains silybin bound to phosphatidylcholine (for better absorption) a lower dose of 5-10 mg\/kg\/day is required.<\/p>\n <\/a> ▲<\/a><\/p>\n In addition to improving growth and food utilisation in some laboratory animals (Khazaei et al<\/em>., 2022), silymarin is also recommended for common marmosets and rabbits at 4-15 mg\/kg PO every 8 or 12 hours, and in rats at 50-200 mg\/kg\/day PO (Carpenter, 2018).<\/p>\n In reptiles, silymarin can mainly be used to control inflammation and limit toxin intake at a dose of 30-40 mg\/kg up to three times a day PO. It is often used in turtles, but is not necessarily useful in hepatic lipidosis (Mart\u00ednez Silvestre, 2018). <\/a> ▲<\/a><\/p>\n Although numerous studies are known about the effects of the milk thistle plant and its derivatives, they are not yet wide applied in animals. Despite the great potential for the application of active substances from milk thistle, not only in alternative or complementary, but also in classical veterinary medicine, primarily in birds, dogs and other species from the human environment, caution is needed in the application of different forms or formulations of preparations on the market, and dosing to ensure the safety and well-being of domestic animals and pets.<\/p>\n <\/a> 1.\tABD EL-GHANY, W. A. (2022): The potential uses of silymarin, a milk thistle (Silybum marianum) derivative in poultry production system. Online J. Anim. Feed Res. 12, 46-52. 10.51227\/ojafr.2022.7 <\/a> ▲<\/a><\/p>\n Silimarin je mje\u0161avina flavonolignanskih frakcija iz ljekovite biljke sikavice koja se prije svega koristi kao hepatoprotektor u ljudi i \u017eivotinja, a djeluje i kao antioksidans, protuupalno, antifibroti\u010dno, antilipidno i peroksidativno sredstvo. Kao dodatak prehrani silimarin se sve vi\u0161e koristi za lije\u010denje raznih bolesti jetre, nekih intoksikacija; za sprje\u010davanje nuspojava kemoterapije te za za\u0161titu bubrega u: pasa, ptica, peradi, kuni\u0107a, ma\u010daka, konja i drugih \u017eivotinja. Klju\u010dne rije\u010di:<\/strong> primjena, egzoti\u010dne ptice, doma\u0107e \u017eivotinje, sikavica, ku\u0107ni ljubimci, silimarin<\/em><\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":" D. \u0110uri\u010di\u0107 and M. Sabli\u0107* Dra\u017een \u0110URI\u010cI\u0106, DVM, PhD, Assistant Professor, Faculty of Veterinary Medicine, University of Zagreb, Croatia; Mirela<\/p>\n","protected":false},"author":8,"featured_media":0,"menu_order":2,"comment_status":"closed","ping_status":"open","template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[2391,2393,2392,2394,2395,2396],"issuem_issue":[2388],"ppma_author":[65],"class_list":["post-7907","article","type-article","status-publish","format-standard","hentry","category-review-articles","tag-application","tag-domestic-animals","tag-exotic-birds","tag-milk-thistle","tag-pets","tag-silymarin","issuem_issue-veterinarska-stanica-56-2"],"yoast_head":"\n
\nDra\u017een \u0110URI\u010cI\u0106<\/strong>, DVM, PhD, Assistant Professor, Faculty of Veterinary Medicine, University of Zagreb, Croatia; Mirela SABLI\u0106<\/strong>*, DVM, Expert Associate, Croatian Veterinary Institute, Branch Veterinary Institute Rijeka, Croatia, (Corresponding author, e- mail: sablic@veinst.hr)<\/div>\n![\"\"](\"https:\/\/veterinarska-stanica-journal.hr\/wp-content\/uploads\/2021\/03\/pdf.png\")
<\/a>https:\/\/doi.org\/10.46419\/vs.56.2.4<\/a><\/div>\n<\/p>\n\nAbstract<\/a>Introduction<\/a>Pharmacokinetics and pharmacodynamics of silymarin<\/a>Effects of silymarin<\/a>Use of silymarin in parrots, exotic birds, and poultry<\/a>Use of silymarin in ruminants, pigs and horses<\/a>Use of silymarin in dogs and cats<\/a>Use of silymarin in other species<\/a>Conclusions<\/a>References<\/a>Sa\u017eetak<\/a><\/span><\/div>\n<\/div>\n\n
Abstract<\/h2>\n
\nIntroduction<\/h2>\n
\nPharmacokinetics and pharmacodynamics of silymarin<\/h2>\n
\n
\nUrinary excretion is insignificant (3-8%).
\nAfter a single dose, bile excretion starts 24 hours later.<\/p>\n
\nTolerance for slow IV infusion in rats was greater than 2 g\/kg, and for oral administration over 10 g\/kg body weight (Fraschini et al<\/em>., 2002; Soleimani et al<\/em>., 2019). <\/p>\nEffects of silymarin<\/h2>\n
\n
\nIn addition to slowing the development of liver disorders by trapping free radicals (superoxide, hydroxyl, hydrogen peroxide and lipid peroxide radicals implicated in liver diseases), silymarin has an anti-inflammatory effect and stimulates the regeneration of liver cells (Marmouzi et al<\/em>., 2021). The chain reaction of lipid peroxidation damages the cell membrane and the oxidation of membrane lipids and proteins continues. Silymarin likely has a dual, antagonistic effect, i.e.<\/em>, by reducing the load of free radicals and by depleting the two main detoxification mechanisms by increasing the level of GSH and stimulating the activity of superoxide dismutase (SOD). It slows fibrogenesis, the development of cirrhosis and deposition of collagen fibres by transforming stellate hepatocytes into myofibroblasts (Gebhardt, 2002). In addition, silymarin enters the cell nucleus and stimulates the enzymes RNA polymerase I and rRNA transcription, leading to an increased formation of ribosomes, which in turn accelerates the synthesis of proteins and DNA (Sonnenbichler and Zetl, 1986). Also, silymarin inhibits the catalytic activity of cytochrome P450 isozymes in vitro<\/em> in very high concentrations that are impossible to achieve in a living organism, thus confirming the harmlessness of the preparation. Finally, silymarin increases membrane stability against damage by inhibition of membrane transport proteins, so it can prevent the absorption of toxins into hepatocytes.<\/p>\nUse of silymarin in parrots, exotic birds, and poultry<\/h2>\n
\n
\nFor example: Silymarin Belupo\u00ae<\/sup> (Belupo, Croatia) capsule contains 168.35-205.76 mg of Silybum marianum<\/em> L. Gaertner fruit, which corresponds to 100 mg of silymarin (expressed as silibinin). The dose for a budgie (body weight about 50 grams) is half a capsule (Silymarin) sprinkled on the grain mixture they are fed with. In parrots, it is used in combination with L-carnitine, betaine, vitamin B12<\/sub> or other hepatoactive compounds.<\/p>\n
\nIt can be used as a hepatotonic and to improve the carcass characteristics of broiler chickens, to improve the immune system of poultry and intestinal health (Suchy et al<\/em>., 2008; Alhidary et al<\/em>., 2017; Abdalla et al<\/em>., 2018; Baradaran et al<\/em>., 2019; Abdulwahid and Oleiwi, 2021). Silymarin as a feed supplement for broilers had a positive effect on growth at the end of the production cycle, reducing oxidative stress, improving meat quality, increasing unsaturated fatty acids and mitigating the negative effects of mycotoxins (Armanini et al<\/em>., 2021).
\nSince silymarin contains many flavonolignans, it has antioxidant, anti-inflammatory, immune stimulating and stabilising effects on liver cells (Abd El-Ghany, 2022).
\nAddition of silymarin to the diet of broiler Japanese quail mitigated the dangerous effects of aflatoxins (Khaleghipour et al<\/em>., 2019).<\/p>\nUse of silymarin in ruminants, pigs and horses<\/h2>\n
\n
\nFor the pharmacokinetics of silymarin in pigs, solid dispersion showed better results with rapid absorption and elimination after oral administration compared to premix, in accordance with previous data on the in vitro<\/em> dissolution of silymarin (Xu et al<\/em>., 2022).<\/p>\nUse of silymarin in dogs and cats<\/h2>\n
\nUse of silymarin in other species<\/h2>\n
\n
\nThe dosage and decision to use silymarin in reptiles should be carefully considered and prescribed by a reptile specialist.<\/p>\nConclusions<\/h2>\n
\n
\nReferences<\/strong> [… show]<\/span><\/a><\/span><\/p>\n ▲<\/a><\/p>\n
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\n3.\tABDULWAHID, M. T. and A. F. OLEIWI (2021): Ameliorating effects of silymarin against mycotoxin and its effect on some production and hematological parameters of broilers. J. Genet. Environ. Conserv. 9, 207-214.
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\n6.\tARMANINI, E. H., M. M. BOIAGO, B. G. DE OLIVEIRA C\u00c9CERE, et al. (2021): Protective effects of silymarin in broiler feed contaminated by mycotoxins: growth performance, meat antioxidant status, and fatty acid profiles. Trop. Anim. Health Prod. 53, 442. 10.1007\/s11250-021-02873-2
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Mogu\u0107nosti primjena i u\u010dinaka silimarina na doma\u0107e \u017eivotinje \u2013 pregledni rad<\/h2>\n
\nDr. sc. Dra\u017een \u0110URI\u010cI\u0106<\/strong>, dr. med. vet., docent, Veterinarski fakultet Sveu\u010dili\u0161ta u Zagrebu, Hrvatska; Mirela SABLI\u0106<\/strong>, dr. med. vet., stru\u010dna suradnica, Hrvatski veterinarski institut – podru\u017enica Veterinarski zavod Rijeka, Hrvatska<\/div>\n
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\nPrimjena silimarina u mlije\u010dnih krava pobolj\u0161ava biokemijski profil krava, smanjuje pojavu ketoze i pove\u0107ava koli\u010dinu proizvedenog mlijeka; u svinja se pobolj\u0161ava probavljivost hranjivih tvari, ukupni prosje\u010dni dnevni unos hrane i prosje\u010dni dnevni prirast te\u017eine, a u sportskih konja dodatak silimarina ubrzava povratak razine kortizola na razine prije vje\u017ebanja. Lipidoza jetre ili bolest masne jetre vrlo je \u010dest poreme\u0107aj u papiga u zato\u010deni\u0161tvu, a nakon dugotrajne primjene 100-150 mg\/kg silimarina u hrani svakih 8-12 sati, po svjedo\u010danstvima vlasnika papiga i veterinara zdravstveno stanje se znatno popravilo.
\nU sustavima intenzivne proizvodnje peradi silimarin se u brojlera koristi kao hepatotonik, za pobolj\u0161anje karakteristika trupa, za pobolj\u0161anje imunosnog sustava i zdravlja crijeva i kao pospje\u0161iva\u010d rasta, a u koko\u0161i nesilica za pobolj\u0161anje kvalitete jaja. Silimarin je ubla\u017eio i negativne u\u010dinke mikotoksina u brojlera, pili\u0107a i japanskih prepelica. Iako se provode brojna istra\u017eivanja o u\u010dinku sikavice i silimarina, njihova \u0161iroka primjena na \u017eivotinjama jo\u0161 nije iskori\u0161tena.<\/p>\n