411 uppsatser · sida 2 av 28
en inventering av populationsstruktur och produktionsnivå
… of the convention, Sweden is obliged to conserve a number of domestic animal breeds and among them the Linderöd pig. In 1952, the zoo, Skånes Djurpark, took care of a pregnant sow that was regarded to be related to the old "forest pig". The old forest pig was thought to have …
en enkätstudie
Background The Shetland Sheepdog is a popular breed of dogs in Sweden. The breed is mostly used as a companion dog and is also popular within certain dog sports such as agility. The Shetland Sheepdog is not included in any breeding programs regarding joint health. The animal …
ett välfärdsproblem för dagens rashundar
For centuries inbreeding has been used to refine traits in dogs, making desired traits more hereditary and thereby, different breeds have been invented. Breed standards have been written for each of these breeds, describing in detail the different characteristics of each breed …
genomic imprinting
… mammals as well as outline the potential use of gene imprinting in livestock breeding. Epigenetics is the mitotical and meiotical partial hereditary variation in genomic activity without any alterations of the DNA sequence. An example of epigenetic regulation is genomic …
enkätundersökning
… housed in a loose-housing system. There is a problem that we don’t know what breeders and licensed riders think about keeping or not keeping young horses during a break-in period in a loose-housing system, especially horses intended to participate at the Swedish three year old …
… virus. In Sweden stallions with viruspositive semen are allowed to be used for breeding. The aim of this study was to investigate if the Swedish rule about EAV in stallions used for AI was followed and to investigate the prevalence of EAV in stallions used for AI. The breeds …
… the inheritance of specific characters, which can be influenced through plant breeding and type of cultivar. The other one is the environmental influences, such as crop rotation, nutrition, harvest and storage. The latter factors are possibly to affect through cultivation …
en fältstudie
… of beef cows increases and this compensate the decrease of dairy cows. Once-breed heifers in Sweden is usually not systematic and it is an unusual production. Once-bred heifers are not a new production system. There were research about it for more than 40 years ago and it …
… from the tests of the three-year-old horses. A comparison was done between breeding values estimated from the total scores of the foals and the BLUP-index (dressage index and jumping index) for stallions with 15 or more evaluated progenies. The estimated heritabilities for foals …
… and the economic importance of this have been in-creasing in dairy cattle breeding lately. Increased longevity contribute to an increased pro-portion of cows that produce milk in more productive lactations and reduces the replace-ment costs together with a good health and …
… 2000 to October 2007 was analysed. Data from 15 purebred herds, 5 from each breed, with at least 400 purebred litters, with in total 19 308 litters were included in the analysis. Two statistical models were applied to the data. One included fixed effects of breed, herd, season …
… review is to give an overview of the differences between pure- and crossbreeding systems. Crossbreeding is a mating system with individuals of different lines or breeds. It is one of several breeding strategies in dairy production used to increase the economic profit. The use of …
… was initiated by a veterinarian, that at stallion performance tests for breeding during a number of years, noted breed differences in various types of testicular disorders. Therefore it was of interests to examine the proportion of testicular disorders within certain breeds. The …
… problem. Another solution could be reached through genetic selection. Present breeding schemes are only focused on direct production characteristics of the individual, like growth performance. Welfare, as well as production, might be improved by including the effect an animal …
Inbreeding has become a problem in some horse breeds. Studies show that it may lead to inbreeding depression which affects e.g. reproduction traits. In the wild there are mechanisms that make horses avoid mating with close relatives. When selection is done by humans this …
