The Ideal Intersection Property for Groupoid Graded Rings

We show that if a groupoid graded ring has a certain nonzero ideal property, then the commutant of the center of the principal component of the ring has the ideal intersection property, that is it intersects nontrivially every nonzero ideal of the ring. Furthermore, we show that for skew groupoid algebras with commutative principal component, the principal component is maximal commutative if and only if it has the ideal intersection property

Estimates of size of cycle in a predator-prey system II

We prove estimates for the maximal and minimal predator and prey populations on the unique limit cycle in a standard predator-prey system. Our estimates are valid when the cycle exhibits small predator and prey abundances and large amplitudes. The proofs consist of constructions of several Lyapunov-type functions and derivation of a large number of non-trivial estimates, and should be of independent interest. This study generalizes results proved by the authors in (Differ Equ Dyn Syst 30, 131-159 (2022)) to a wider class of systems and, in addition, it gives simpler proofs of some already known estimates

A field study of management stress in reindeer (Rangifer tarandus L)

The impact of stress was studied in semidomesticated reindeer subjected to various herding and handling methods. In herded and handled animals, stress lesions were found, such as abomasal haemorrhage, muscular and myocardial degeneration and marked changes in blood constituents. The degree of change was dependent of the magnitude of stress the animal had been exposed to. Manual handling and restraint was found to be one of the major stress factors. There were evident indications of a cumulative effect of repeated stress events. The use of motor vehicles (helicopter and snow-scooter), for herding and transporting the animals, was found to be an important stress factor. It is concluded that various herding and handling methods studied in the present investigation led to varying degrees of deleterious effects on the health of the animals and a poorer meatquality from slaughtered animals. Hence herding should be undertaken as carefully as possible, the time taken for manual handling should be minimized, and the corrals be so constructed as to cause a minimum of disturbance, capture and restraint. Transportation should be undertaken very cautiously with as little manual handling as possible during loading and unloading. To obtain a good meat quality, animals to be slaughtered should be subjected to a minimum of handling, i.e. slaughter should take place as quickly as possible. Transportation of live animals to slaughterhouses and the keeping of animals in corrals, pens or crates whilst awaiting slaughter will result in a lowered meat quality and should therefore be avoided.En fåltstudie av stress hos ren i samband med olika hanteringsformer.Abstract in Swedish / Sammanfatning: Betydelsen av stress hos ren studerades i hjordar i vilka olika typer av samlings- och hanteringsmetoder anvandes. I samtliga hjordar som utsatts for olika former av drivning forelag hos slaktdjur skador betingade av stress i form av magblodningar, muskelsonderfall och forandringar i blodbilden. De funna skadorna och forandringarna var beroende av den grad av stress som djuren utsatts for. Manuell hantering och inskrankning av djurens rorelsefrihet befanns vara en av de huvudsakliga stressfaktorerna. Det forelag åvenledes en stark indikation på en kumulativ effekt av upprepad stress. Anvandning av motorfordon (helikopter, snoskoter) vid drivning samt vågtransport av levande djur befanns vara betydande stressfaktorer. Det kan fastslås att de olika hanteringsformerna inneburit olika grader av stress. Graden av stresspåverkan innebår olika grader av negativa effekter dels allmånt for djurens hålsotillstånd dels for en forsåmrad kottkvalitet. Sålunda bor drivningar foretagas så forsiktigt som mojligt och tiden for manuell hantering goras så kort som mpjlig. Dårtill bor gårdor konstrueras så att yttre storning, manuell hantering och begrånsning av djurens rorelsefrihet minimeras. Transporter bor genomforas med forsiktighet och med undvikande av manuell hantering vid lastning och lossning. Slakt bor foretagas omedelbart, dvs vid gårdan. Transport av levande djur, samt hållandet av djur i gårdor eller fillor i vantan på slakt innebår att kottkvaliteten forsåmras och bor således undvikas.Kenttâtutkimus porojen stressistâ erilaisten kâsittelymuotojen yhteydessà.Abstract in Finnish / Yhteenveto: Stressin merkitystâ poroissa tutkitaan laumoissa, joissa kàytetààn erilaisia kokoamis - ja kàsittelymenetelmià. Kaikissa laumoissa, jotka olivat joutuneet alttiiksi erilaisille ajomuodoille, oli teuraselàimissâ stressin aiheuttamia vammoja mahaverenvuotojen, lihasrappeutumien ja verikuvan muutosten muodossa. Lôydetyt vammat ja muutokset olivat stressin aiheuttamat siina suhteessa kuin elaimet olivat siihen joutuneet. Kàsin pitely ja elàinten liikuntavapauden rajoittuminen havaittiin olevan yksi pààsiallisista stressintekijôistà. Oli esillà myôs voimakas osoitus kasvavan vaikutuksen toistuvasta stressistâ. Moottoriajoneuvojen (helikopteri, moottori-kelkka) kàyttô ajossa sekà elàvien elàinten tiekuljetus nayttivàt olevan merkittàvià stressitekijôità. Voidaan todeta, ettà erilaiset kasittelymuodot ovat aiheuttaneet stressin erilaisia asteita. Stressin vaikutuksen taso aiheutti eri asteisia negatiivisia vaikutuksia osittain huonontuneeseen lihan laatuun. Nainollen pitàà ajot suorittaa niin varovaisesti kuin mahdollista ja aika kàsin pitelyyn tehtàvà niin lyhyeksi kuin mahdollista. Sen lisàksi pitàà aidât rakentaa niin, ettà ulkoista hàirintàà, kàsin pitelyà ja elàinten liikuntavapauden rajoitusta vàhennetààn. Kuljetukset pitàà suorittaa varovaisuudella ja koettaa vàlttàà kàsin pitelyà kuormauksessa ja purkauksessa. Teurastaminen pitàà suorittaa vâlittômàsti, toisin sanoen aidan luona. Elàvien elàinten kuljetus, sekà elàinten pitàminen aitauksissa tai tarhoissa teurastamista odotellessa aiheuttaa lihalaadun huonontumiseen ja pitàà nàin ollen vàlttàà

Influence of slaughter age and carcass suspension on meat quality in Angus heifers

This study investigated the effects of pelvic suspension and slaughter age on longissimus thoracis et lumborum (LTL) from 40 heifers with at least 75% Angus breeding. A total of 20 heifers were slaughtered directly from pasture at 18 months of age, and carcass sides were hung either by the Achilles tendon or the pelvic bone. The other 20 heifers were assigned to an additional winter housing period and slaughtered at 22 months of age; carcass sides were hung only by Achilles suspension. All carcasses were electrically stimulated and assessed according to the EUROP carcass classification system. In addition, the LTL muscles were aged for 7 or 14 days before meat quality was evaluated for intramuscular fat (IMF), drip loss, colour, shear force, compression and sensory analysis. The 22-month-old heifers were heavier, fatter and had more IMF than 18-month-old heifers. Conformation scores (muscling) did not differ between the two slaughter groups. Pelvic suspension reduced both between- and within-animal variation for peak force, total energy and compression peak force. For the 18-month-old heifers, pelvic suspension also decreased peak force, total energy and compression variables for the LTL muscles from both ageing periods, whereas Achilles-suspended samples had lower shear force values only at day 14. Sensory analysis showed that pelvic-suspended sides had greater tenderness, lower bite resistance, less threadiness, higher juiciness and meat flavour and less visible marbling than meat from Achilles-suspended sides. Pelvic-suspended sides at 18 months of age were similar in peak force and total energy values to the 22-month-old heifers. The importance of ageing the Achilles-suspended sides was more obvious for samples from 18-month-old heifers than from the 22-month-old animals. The correlations between the different instrumental measurements and sensory tenderness were considerably higher for carcasses suspended by the Achilles tendon (r = -520.55 to 0.20) than for those hung by the pelvic bone (r = -520.25 to 0.19). More correlations between sensory-evaluated tenderness and shear variables were significant after 7 days (n = 6) of ageing than after 14 days (n = 4) of ageing. This study clearly shows the benefits of pelvic suspension, which reduces the need for additional feeding after pasture