Sökning: "Lantbruksvetenskaper Husdjursvetenskap"
Visar resultat 1 - 5 av 146 avhandlingar innehållade orden Lantbruksvetenskaper Husdjursvetenskap.
1. Human-Human and Human-Animal Interaction : Some Common Physiological and Psychological Effects
Sammanfattning : The aim of the present thesis was to investigate hormonal and physiological effects in mothers during a breastfeeding session and in dogs and their owners in response to short-term interaction. In study one, sixty-six mothers receiving either exogenous oxytocin infusion and/or epidural analgesia (EDA) during labor or intramuscular oxytocin injection post partum were studied. LÄS MER
2. Organic dairy production : herd characteristics and genotype by environment interactions
Sammanfattning : The aim of this thesis was to gain further knowledge about the performance of cows in organic dairy production and their ability to adapt to the organic production environment. Milk production traits, fertility traits, somatic cell count (SCC) and longevity traits were analysed in organic and conventional herds and the reasons for culling in the two systems were investigated. LÄS MER
3. Welfare indicators in laying hens
Sammanfattning : There is a growing concern regarding the welfare of laying hens worldwide and there are both ethical and economic reasons for improving their welfare. Although several different welfare indicators are used today, their ability to accurately reflect welfare status is sometimes questioned. LÄS MER
4. Impact of litter size on sow health and welfare
Sammanfattning : Genetic improvement of litter size has been the main breeding goal in piglet production during the last decades, resulting in a steady increase in total number of born piglets in each litter both in Sweden and in other European countries. It has been suggested that large litters pose a major welfare problem for sows and piglets. LÄS MER
5. The effect of dry period length on milk production, health and fertility in two cow breeds
Sammanfattning : The transition from not producing milk during the dry period to the huge nutrient demands as milk production rapidly increases after parturition imposes significant metabolic strain on high-yielding dairy cows. The drying-off procedure is also demanding and high milk yield at dry-off increases the risk of mastitis and metabolic problems. LÄS MER