Seleeni olulisusest veise organismis
Laen...
Kuupäev
2012
Kättesaadav alates
ainult raamatukogus, only in library
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
Seleen on mikroelement, mis on organismile tähtis eelkõige antioksüdandina, kuid osaleb ka hormoonide ja immuunsüsteemi reguleerimisel. Veistel seostatakse seleenipuudust nõrgenenud immuunsüsteemi, langenud viljakuse ja valgelihastõvega. Seleeni defitsiit Eesti veistel on põhjustatud mulla ja taimede madalast seleeni sisaldusest. Töö eesmärk oli välja selgitada seleeni lisasöötmise mõju täiskasvanud veisele, lootele ja vasikale ning leida vastus küsimusele, kas lehmale seleeni lisasöötmisega on võimalik ennetada seleenidefitsiiti vasikatel.
Veiste söötades on võimalik seleeni sisaldust tõsta põllumaade seleenväetistega väetamisega ning orgaanilise või anorgaanilise seleeni lisamisega söödale. Orgaanilise seleeni söötmine, eriti seleeniga rikastatud pärmina, tõstab efektiivsemalt vere, kudede ja piima seleenisisaldust. Lehmade sööda seleenisisaldus mõjutab ka loote ja vasika organismi seleenitaset, kuna seleen läbib platsentat. Tagamaks piisav seleenivaru vasika kudedes tuleks lehmadele seleeni lisaks sööta vähemalt tiinuse viimasel 60-l päeval. Seleen kandub ema verest piima ning piimaperioodil sõltub vasika seleeniga varustatus piima seleeni sisaldusest. Piima seleeni sisaldus langeb 3-4 nädala jooksul pärast lisaseleeni söötmise lõpetamist endisele tasemele ning seetõttu peaks lehmadele seleeni lisaks söötma kogu laktatsiooni vältel.
Selenium is a trace element that is an important antioxidant and plays a significant role in the regulation of hormones and the immune system. Selenium deficiency has been associated with weakened immune system, decreased fertility and white muscle disease. Selenium deficiency in Estonian cattle is due to low selenium levels in soil and grass. The aim of this study was to investigate the effect of selenium on dairy cattle and explore the possibilities of raising the level of selenium in cows and calves. Selenium content of feeds can be increased by using selenium-enriched fertilizers. The need for selenium in cattle can also be met by adding inorganic or organic selenium to the feed. Organic selenium, especially fed with selenized yeast, has a bigger effect on increasing the selenium content in blood, tissues and milk. Selenium concentration of feeds also affects the level of selenium in newborn calves as selenium is transferred through the placenta. To ensure adequate selenium reserves in tissues of newborn calves , selenium should be fed to cows at least for the last 60 days of gestation. Selenium is also transferred to milk. This means that selenium level in calves is affected by the selenium concentration of milk. Selenium should be fed throughout the lactation period to prevent a decline in milk selenium concentration.
Selenium is a trace element that is an important antioxidant and plays a significant role in the regulation of hormones and the immune system. Selenium deficiency has been associated with weakened immune system, decreased fertility and white muscle disease. Selenium deficiency in Estonian cattle is due to low selenium levels in soil and grass. The aim of this study was to investigate the effect of selenium on dairy cattle and explore the possibilities of raising the level of selenium in cows and calves. Selenium content of feeds can be increased by using selenium-enriched fertilizers. The need for selenium in cattle can also be met by adding inorganic or organic selenium to the feed. Organic selenium, especially fed with selenized yeast, has a bigger effect on increasing the selenium content in blood, tissues and milk. Selenium concentration of feeds also affects the level of selenium in newborn calves as selenium is transferred through the placenta. To ensure adequate selenium reserves in tissues of newborn calves , selenium should be fed to cows at least for the last 60 days of gestation. Selenium is also transferred to milk. This means that selenium level in calves is affected by the selenium concentration of milk. Selenium should be fed throughout the lactation period to prevent a decline in milk selenium concentration.
Kirjeldus
Märksõnad
seleen, seleenisisaldus, veis, söötmine, söödad, veiste haigused, oksüdatiivne stress, Eesti, bakalaureusetööd