12 uppsatser
finns det genetisk variation som kan användas i avelsarbetet?
… the variation in calving interval for beef cows of different breeds and ages registred in KAP was studied. Genetic parameters were calculated for charolais and hereford. Data from Svensk Mjölk were used. In the analyses purebred cows that calved between the years 1987 and 2005 …
… 0,08. Calvings are therefore largely affected by environmental factors such as age at first calving, season and herd. Indirect selection could be preferred instead of direct selection on certain traits that have low heritabilities or are difficult to measure. Rump angle and rump …
relaterat till data ifrån egen besättning
… the heifer reach puberty and have her first oestrus at around 9-12 months of age. In the critical period the mammary gland starts to grow at a fast rate and Insulin-like growth factor-1 (IGF-1) transport the growth signals to the mammary glands. If the heifer is reared at …
… to feed according to their needs. The cowscould be fed high-quality silage, but it is also important that they do not get too much of this asthe have a risk of overfeeding. The ration should therefore be balanced with straw. Free accessto minerals and a salt lick is also …
en fältstudie
… but the Swedish production has no followed this trend. In 2004, the percentage of beef self-sufficiency in Sweden was 60 %. Sweden was earlier a net exporter but changed during the 1990:s to become a net importer of beef. The import increased dramatically when Sweden joined the …
… colostrum results in a high blood concentration of immuno-globulins until the age of eight months. This leads to a lower incidence of diseases that can affect the growth and development negatively. Diarrhea is the most common disease in calves younger than 30 days. An infected …
… own performance. Breeding values in Sweden today are based on lactation averages. To be able to estimate a breeding value for a cow she needs to have a complete 305 days lactation. A mean value that represents the whole lactation is used to estimate a breeding value. An …
… their second winter. Both indoor and outdoor heifer groups were fed grass silage ad libitum throughout the experimental period that lasted from October until May. The objective of this study was to evaluate the long term effects of being raised in these two environments. This …
Live-weight at different ages for Swedish Holsteins (SLB) and for the Swedish Red and White Breed (SRB), and the correlation to heart girth and height at withers. The aim of this investigation was to study the live-weight changes and mature weight for the Swedish Red and White …
… good health, the group should not be too large and the difference in the age between the calves should not bee too large. By keeping calves in pairs, health is at low risk and still the calf can perform social and play behavior. To overcome health problems in a herd, calves can …
a case study of goals and decision-making within the household
… on this partition of chores between men and women, they also have different management routines, ambitions and strategies regarding the milk production. Normally, the herd owners? emphasis is on increasing the herd size, animal welfare and herd productivity. The decision where …
a study of the advisory service "Ask the Cow" and the web report "Animal Welfare Signals"
… herds at risk of having poor animal welfare. However, the welfare indicator of age at first calving was found in all final test-kits and can therefore be considered particularly interesting. ”Ask the Cow” and ”Animal Welfare Signals” reflect the same view of animal welfare, but …
