Search for dissertations about: "animal performance"

Showing result 1 - 5 of 183 swedish dissertations containing the words animal performance.

  2. 1. Genetics of sow performance in piglet production

    Author : Helena Lundgren; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : The aim of this thesis was to provide knowledge about the genetic relationships concerning sow performance in piglet production. During the last decades, selection in dam lines has focused on increasing litter size and piglet growth. Consequently, the demand on the sow to provide her piglets with enough milk increases. READ MORE

  4. 2. Performance of Ankole and crossbred cattle in Rwanda

    Author : Manzi Maximillian; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : The general aim of this thesis was to evaluate how effective crossbreeding could be for increasing productivity in meat and milk production in Rwanda. This was done by assessing performance of Ankole (A) and its crossbreds with exotic breeds: Brown Swiss (B), Holstein Friesian (F), Jersey (J) and Sahiwal (S). READ MORE

  5. 3. Sow reproduction and piglet performance in multi-suckling pens

    Author : Ola Thomsson; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : Production systems with group housing of sows at different stages of production are increasing in Europe, as an effect of public demand for more animal welfare-friendly pig production. Some niche certified piglet production systems keep lactating sows with piglets in groups in multi-suckling pens. READ MORE

  6. 4. Genetic Heteroscedasticity for Domestic Animal Traits

    Author : Majbritt Felleki; Erling Strandberg; Lars Rönnegård; Ole Fredslund Christensen; Högskolan Dalarna; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Quantitative genetics; genetic heteroscedasticity of residuals; genetic heterogeneity of environmental variation; genetic heterogeneity of residual variance; double hierarchical generalized linear models; teat count in pigs; litter size in pigs; milk yield in cows; somatic cell count in cows; Complex Systems – Microdata Analysis; Komplexa system - mikrodataanalys;

    Abstract : Animal traits differ not only in mean, but also in variation around the mean. For instance, one sire’s daughter group may be very homogeneous, while another sire’s daughters are much more heterogeneous in performance. The difference in residual variance can partially be explained by genetic differences. READ MORE

  7. 5. Dissecting the genetics of athletic performance and conformation traits in horses

    Author : Maria Rosengren; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : The overall aims of this thesis were to investigate the genetics of athletic performance and the level of inbreeding in Coldblooded trotters, as well as the genetics of conformation traits in Icelandic horses. In paper I, genomic-based inbreeding coefficients in Coldblooded trotters were estimated and compared with pedigree-based coefficients. READ MORE