Essays about: "rearing density"

Showing result 1 - 5 of 9 essays containing the words rearing density.

  1. 1. The broiler production systems of Sweden and the United States : a comparison of the processing systems andhealth and welfare programs

    University essay from SLU/Department of Molecular Sciences

    Author : DenaMarie Bengtsson; [2021]
    Keywords : animal welfare; antibiotics; automation in poultry production; breeders; broilers; conventional broilers; feed; hatcheries; organic broilers; poultry production; poultry slaughter; poultry vaccines;

    Abstract : The aim of this thesis was to research broiler production in Sweden and the United States and to evaluate their processing systems as well as their health and welfare regulations. Sweden produces 110 million broilers a year and the United States produces 9 billion broilers a year. READ MORE

  3. 2. Hur gruppstorlek påverkar tillväxt hos hussyrsan (Acheta domesticus)

    University essay from SLU/Dept. of Ecology

    Author : Hedda Björk Ericsson; [2021]
    Keywords : Acheta domesticus; grupp-effekt; hussyrsa; tillväxthastighet; individstorlek;

    Abstract : Ökad tillväxthastighet har observerats bland insekter som hålls i grupp. Begreppet för fenomenet är grupp-effekt (group effect), vilket beskrevs 1958 av Rémy Chauvin. Det finns olika förklaringar till varför tillväxten ökar, men det är osäkert vad den bakomliggande mekanismen är. READ MORE

  4. 3. The effect of stump extraction on the diversity of saproxylic insects in the roots of Norway spruce (Picea abies) stumps

    University essay from SLU/Dept. of Ecology

    Author : Markus Juuso; [2015]
    Keywords : tree stump extraction; Norway spruce; Picea abies; roots; Sweden; saproxylic insects; biodiversity; ecological trap; saproxylic beetles; effect of stump extraction; stump extraction piles; biofuel; stumps;

    Abstract : This study examined the effect of tree stump extraction on the diversity of saproxylic insects in Norway spruce Picea abies roots. I tested if the density of saproxylic beetles was the same in the interior layer of the stump storage piles as in the exterior layer. READ MORE

  5. 4. Monogami hos fåglar

    University essay from SLU/Dept. of Biomedical Sciences and Veterinary Public Health

    Author : Nina Kristoffersson; [2015]
    Keywords : genetisk monogami; sexuell monogami; fåglar; EPP; EPC; genetic monogamy; sexual monogamy; birds;

    Abstract : Man har förr trott att fågelpar inom många arter, t ex albatrosser och kungspingviner, är varandra trogna livet ut. Syftet med denna litteraturstudie är att ta reda på om det finns något vetenskapligt stöd för sexuell eller genetisk monogami hos någon fågelart. Uttrycket ”monogami” kan ha flera betydelser. READ MORE

  6. 5. Manipulations of feed ration and rearing density : effects on river migration performance of Atlantic salmon smolt

    University essay from SLU/Dept. of Wildlife, Fish and Environmental Studies

    Author : Mansour Royan; [2013]
    Keywords : Atlantic salmon; smolt; feed restriction; rearing density; migration; mortality; migration speed;

    Abstract : The out-migration of Atlantic salmon smolts was studied at the lower part of the Umeå River (River Umeälven) from the Norrfors dam towards the sea (Bothnian Bay) in northern Sweden. Two-year old hatchery-reared Atlantic salmon (n=250) were tagged with acoustic transmitters and released downstream of the Norrfors dam and monitored while migrating downstream. READ MORE