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Sirvi Autor "Karis, Priit" järgi

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  • Pisipilt
    Kirje
    Ainevahetuslikud vastused glükoosi infusioonile erinevas toitumuses eesti holsteini lehmadel
    (2015) Karis, Priit; Jaakson, Hanno (juhendaja); Ling, Katri (juhendaja)
    Magistritöös kasutatud materjal koguti institutsionaalse uurimistoetuse projekti „Piimalehmade sigimine ja tervis.“ (IUT8-1) raames. Eesmärgiks oli uurida kolm nädalat enne ja kolm nädalat pärast poegimist erinevas toitumuses eesti holsteini tõugu lehmade süsivesikute ja lipiidide ainevahetust iseloomustavate vere metaboliitide dünaamikat vastusena glükoosi infusioonile. Valimisse võeti 44 multipaarset eesti holsteini lehma, kes jagati vastavalt toitumushindele kolme rühma: alamäärases toitumuses (≤ 3,0), optimaalses toitumuses (3,25-3,5) ja ülemäärases toitumuses (≥ 3,75). Intravenoosse glükoosi tolerantsi testi ajal võeti vereproovid sõltuvalt glükoosi infusioonist aegadel: -5., 5., 10., 20., 30., 40., 50., 60. minutil. Vereproovidest määrati glükoosi, esterifitseerimata rasvhapete, β-hüdroksübutüraadi ning triglütseriidide kontsentratsioon. Glükoosi infusioon tõi endaga kaasa lühiajalised muutused loomade ainevahetuslikes seisundites, mille dünaamikad rühmade vahel olid sarnased, kuid erinesid absoluutväärtustes. Lehmade ainvahetus poegimisjärgselt oli intensiivsem, mida näitas glükoosi kiirem kadu verest. Samuti leiti, et ainevahetuse seisund on seotud varulipiidide hulgaga enne poegimist.
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    Kirje
    Associations between insulin resistance and inflammation during the transition period in dairy cows : [presentation]
    (Estonian University of Life Sciences, 2024) Karis, Priit; Jaakson, Hanno; Teder, Siim; Ling, Katri
    There are still many unknowns regarding insulin resistance (IR) in dairy cattle, including when it develops (whether pre- or postpartum), its underlying causes, and its role in the development of various pathologies during the transition period.
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    Kirje
    Body condition effects on dry matter intake and metabolic status during the transition period in Holstein dairy cows
    (Estonian Academic Agricultural Society, 2021) Karis, Priit; Jaakson, Hanno; Ling, Katri; Runin, Maksim; Henno, Merike; Waldmann, Andres; Ots, Meelis; Chair of Animal Nutrition, Institute of Veterinary Medicine and Animal Sciences, Estonian University of Life Sciences; Chair of Animal Breeding and Biotechnology, Institute of Veterinary Medicine and Animal Sciences, Estonian University of Life Sciences
    The objective was to evaluate dry matter intake, metabolite concentrations and milk production of cows with different dry period body condition score (BCS). In addition, to support these results with previously reported insulin resistance and adipose tissue mRNA data on the same cows. Multiparous Estonian Holstein cows (n = 42) were assigned to three experimental groups on the basis of BCS 28 days before expected calving (d –28) as follows: BCS ≤ 3.0 (2.25–3.00; thin (T), n = 14); BCS = 3.25–3.5 (optimal (O), n = 14); BCS ≥ 3.75 (3.75–4.50; over-conditioned (OC), n = 14). Blood samples were taken between d –21 and d 42 in relation to calving, milk production data were collected throughout lactation. The OC cows' adaptation to the demands of lactation was the worst based on the comparison of dynamics of blood parameters between BCS groups. They had the most unbalanced metabolism and used more stored lipids compared to T and O cows. Fatty acids concentrations in the first week of lactation, related to insulin resistance status in the dry period and DMI in the first days of lactation, describe most of the variation (R2 = 0.55) in BCS loss during the first 42 days of lactation.
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    Kirje
    The effects of rumen-protected glucose supplementation in transition of high-yielding Holstein dairy cows : [presentation]
    (Estonian University of Life Sciences, 2024) Teder, Siim; Karis, Priit; Ling, Katri; Jaakson, Hanno
    INTRODUCTION. During the transition period, cows experience several energy-demanding changes: 1. rapid growth of the fetus, 2. production of colostrum and milk, 3. healing of the reproductive system after parturition. Due to reduced feed intake, falling into negative energy balance is generally inevitable. Rumen-protected glucose (RPG) is proposed to help cope with energy deficiency.
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    Kirje
    Kinnisperioodi söötmisstrateegia välja töötamine kõrge aretusväärtusega piimakarjale : lõpparuanne
    (Eesti Maaülikool, 2020) Ots, Meelis; Karis, Priit
    Eestis on viimastel aastakümnetel tehtud järjekindlat ja tõhusat aretustööd piimaveiste toodanguvõime tõstmiseks. Loomade heaolu tähtsustamisest lähtuvalt on parandatud veiste pidamistingimusi. Söötmiskorraldus on teadlik ja eesmärgipärane. Parandatud on põhisöötade (eeskätt silo) kvaliteeti. Söödaratsioonide koostamisel minnakse sügavuti, need on täpsed ja võtavad arvesse üha enam parameetreid. Seda kõike tehakse selleks, et tagada kõrge aretusväärtusega piimakarja igakülgne toitefaktoritega varustatus, hea tervis ja jõudlus ning pikaealisus. Eestis on senistes piimaveistega läbi viidud uuringutes enam tähelepanu pööratud laktatsiooniperioodi lehmade söötmisega seotud küsimustele, kinnislehmade söötmisega seonduv on aga jäänud tahaplaanile. Sellest tulenevalt seati uuringu lähteülesandeks välja töötada Torma POÜ-le Eesti tingimustesse sobiv ja kaasaegsetel seisukohtadel põhinev piimakarja kinnisperioodi söötmisstrateegia, mille tulemusena paraneb piimalehmade tervis, karjas püsimine, heaolu ja produktiivsus. Selleks tuli kõigepealt välja selgitada puhkeperioodi söödaratsiooni energiakontsentratioon, mille korral lehmade toitumushinne kinni jätmisest ettesöötmise alguseni (ca 21 päeva enne loodetavat poegimist) ei muutu. Leitud optimaalset puhkeperioodi söödaratsiooni energiakontsentratsiooni rakendades oli ülesanne uurida ettesöötmise mõju lehmade tervisele ja jõudlusnäitajatele üleminekuperioodil.
  • Pisipilt
    Kirje
    Relationships between body condition, lipomobilization and insulin resistance in dairy cows
    (Eesti Maaülikool, 2021) Karis, Priit; Jaakson, Hanno (advisor); Ling, Katri (advisor); Ots, Meelis (advisor); Kokkonen, Tuomo (opponent)
    The first weeks of lactation are the most demanding period for the metabolism throughout the calving cycle of a dairy cow. Most of the disease events occur during that period; this highlights the need for deeper understanding of cows’ adaption to lactation to increase the welfare of cows and profitability of farm. Insulin is a pancreatic hormone that has a key role in energy metabolism, in general, it promotes storage of energy within organism. Insulin resistance is a state when insulin causes less than normal response in target tissues. It causes intensive lipolysis, which is a risk factor for the occurrence of numerous metabolic diseases. This doctoral thesis elaborates on the relationships of the volume of adipose tissue during dry period with lipolysis, insulin resistance, and the expression of genes and concentration of proteins in adipose tissue that regulate glucose and lipid metabolism. Four weeks before expected calving multiparous Estonian Holstein dairy cows (n=42) were grouped into three according to their body condition score. Three weeks before and after calving intravenous glucose tolerance test and biopsy from subcutaneous adipose tissue were performed. After the formation of experimental groups, blood samples were taken weekly and body condition was assessed fortnightly. Milk samples were taken and zootechnical data registered until the end of the lactation. The energy corrected milk production of over-conditioned cows was higher than that of optimal or thin cows, but the higher production was achieved at the expense of intensive use of energy stored in adipose tissue. Cows that were more resistant to insulin action before calving were prone to intensive lipolysis at the beginning of lactation, which was related to lower expression of lipogenic genes and lower concentration of glucose transporter 4 in subcutaneous adipose tissue. Results clearly show that excessive volume of adipose tissue increases metabolic load and the risk of metabolic diseases. Monitoring body condition of dairy cows gives an opportunity to assess the feeding level on the farm and to avoid overconditioning.
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    Kirje
    Supplementary table for Henno et al. in the Journal of Dairy Science with the title Effect of monensin on milk fatty acid profile in dairy cows and on the use of fatty acids for early diagnosis of elevated blood plasma concentrations of nonesterified fatty acids and hyperketonemia
    (2021) Henno, Merike; Ling, Katri; Kaart, Tanel; Ariko, Tiia; Karis, Priit; Jaakson, Hanno; Kuusik, Sirje; Ots, Meelis
    The use of monensin to reduce health disorders associated with negative energy balance in transition cows is widely used. Precalving continuous-release monensin capsule administration affected postcalving milk FA profile indicating alterations in the rumen microbiota of these cows.
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    Kirje
    Terve loom : konverentsi "Terve loom 2024" posterettekanded
    (Eesti Maaülikool, 2024) Allmang, Cristin; Hussar, Piret; Järveots, Tõnu; Dūrītis, Ilmārs; Moskalenko, Lidiia; Mõtus, Kerli; Viltrop, Arvo; Teder, Siim; Karis, Priit
    Cristin Allmang, Piret Hussar, Tõnu Järveots, Ilmārs Dūrītis. SGLT1, SGLT2 and GLUT2 immunolocalization in kidneys of chicken in different age.
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    Kirje
    Terve loom ja tervislik toit : konverentsi "Terve loom ja tervislik toit 2017" postrid
    (Eesti Maaülikool, 2017) Mõtus, Kerli; Viltrop, Arvo; Emanuelson, Ulf; Raudsepp, Piret; Libek, Elmo; Rätsep, Reelika; Kikas, Ave; Libek, Asta-Virve; Arus, Liina; Kaldmäe, Hedi; Bleive, Uko; Ausmees, Kristo; Ehrlich-Peets, Kersti; Vallas, Mirjam; Veskioja, Andre; Rammul, Kadi; Rehema, Aune; Zilmer, Mihkel; Songisepp, Epp; Kullisaar, Tiiu; Karis, Priit; Jaakson, Hanno; Ling, Katri; Ilves-Luht, Aire; Samarütel, Jaak; Valdmann, Andres; Reimann, Ene; Pärn, Pille; Bruckmaier, Rupert M.; Gross, Josef; Kaart, Tanel; Ots, Meelis; Valdmann, Merle; Valdmann, Andres; Leming, Ragnar; Kaasik, Allan; Kruus, Eha; Lauringson, Enn; Põldma, Priit; Timonen, Anri Aino Elisa; Katholm, Jørgen; Petersen, Anders; Kalmus, Piret; Reimus, Kaari; Orro, Toomas; Emanuelson, Ulf; Niine, Tarmo; Lassen, Brian; Mäesaar, Mihkel; Roasto, Mati; Runin, Maksim; Olt, Andres; Mark, Elina; Pärn, Pille; Kurõkin, Jevgeni; Kavak, Ants; Reilent, Andres; Jaakma, Ülle
    Kerli Mõtus, Arvo Viltrop, Ulf Emanuelson. Ammlehmade farmis hukkumise riskitegurid ekstensiivse pidamisviisiga lihaveisekarjades.
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    Terve loom ja tervislik toit : konverentsi "Terve loom ja tervislik toit 2019" stendiettekanded
    (Eesti Maaülikool, 2019) Jõudu, Ivi; Pääso, Piia; Kuldjärv, Rain; Bljahhina, Anastassia; Raudsepp, Piret; Anton, Dea; Meremäe, Kadrin; Roasto, Mati; Püssa, Tõnu; Sats, Andres; Laikoja, Katrin; Rünk, Katrin; Soidla, Riina; Kerner, Kristi; Tepper, Marek; Kaart, Tanel; Tänavots, Alo; Põldvere, Aarne; Karis, Priit; Henno, Merike; Ariko, Tiia; Jaakson, Hanno; Ling, Katri; Ots, Meelis; Leming, Ragnar; Kass, Marko; Nahkur, Esta; Namm, Aimar; Torga, Taavi; Arend, Andres; Aunapuu, Marina; Olt, Andres; Songisepp, Epp; Soonberg, Maria; Barraclough, Rosie; Haskell, Marie; Arney, David
    Ivi Jõudu, Piia Pääso. Eesti Maaülikooli Toidu- ja kõrvalsaaduste väärindamise tehnoloogiate ERA õppetool (VALORTECH).