Essays about: "hatcheries"

Found 5 essays containing the word hatcheries.

  1. 1. How does hatchery stress affect the development of play behavior?

    University essay from Linköpings universitet/Institutionen för fysik, kemi och biologi

    Author : Gabrielle Lundén; [2022]
    Keywords : Animal behavior; Animal welfare; Gallus domesticus; Hatchery stress; Play behavior;

    Abstract : Play is a behavior mainly observed in young individuals that can differ greatly between species in both function and appearance. Presence of play indicates positive experiences in animals, making play a useful assessment tool for animal welfare. Commercial hatcheries expose chicks to several stressors that can affect both behavior and welfare. READ MORE

  3. 2. 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

  4. 3. Identifying factors of importance for chick quality and traits that may predict chick quality

    University essay from SLU/Dept. of Animal Nutrition and Management

    Author : Cecilia Hjelm; [2018]
    Keywords : chick quality; chick quality score; first week mortality; broiler breeder; IgY yolk concentration; IgY serum concentration;

    Abstract : In the hatcheries today, the eggs that have cracks are sorted out before incubation. When hatched the chicks are graded as saleable or unsaleable, and salable chicks are transported to the farm. First week mortality (FWM) is a common way to assess chick quality and performance at the farm and it varies among flocks. READ MORE

  5. 4. Risk taking and downstream migration in hatchery reared Atlantic salmon (Salmo salar) smolt

    University essay from Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Author : Fia Finn; [2015]
    Keywords : Behavior; migration; risk taking; boldness; Salmo salar;

    Abstract : Individual variation and limited plasticity in behavior are factors that have been shown to shape populations and determine how well individuals are doing in different stages of life. When salmon transform from parr to smolt and start the migration out to sea many factors together make an individual successful. READ MORE

  6. 5. Skillnader i migrationsframgång mellan vild och odlad laxsmolt (Salmo salar L.)

    University essay from SLU/Dept. of Forest Ecology and Management

    Author : Anton Holmsten; Viktor Johannessen; [2013]
    Keywords : konditionsfaktor; predation; utsättning; Umeälven; kompensationsodling;

    Abstract : Laxen är en anadrom fiskart som reproducerar sig i sötvatten men lever huvuddelen av sitt vuxna liv i saltvatten. På grund av vattenkraftens dammbyggen hindras laxen att göra dessa habitatbyten och reproduktionen drabbas. READ MORE