5 uppsatser
… pregnant all year round. The reproduction season is mainly controlled by the photoperiod and breeds from high latitudes are more seasonal than breeds that origin from the equator. Reproduction season can be artificially controlled by light programs or with hormone treatment, but …
… First a literature study where quantification of light, the concept dormancy, photoperiod and light quality are discussed. Second an experimental part, where the importance of light for sprouting capacity in root buds of perennial sow thistle (Sonchus arvensis L.) is …
The aim of this study was to investigate the relationship between sleep, photoperiod, milk yield and hormones connected to milk formation. Variations of prolactin (PRL) and Insulin-Like growth factor-1 (IGF-1) in plasma were measured during two different light programs. The …
… being sheed in the spring. The thermal insulation of coat depends mainly by photoperiod and give varying hair lenght, thickness and density of the hair. In competition horses clipping is common which decreases the thermal insulation and lower the respiration rate after work than …
… range of responses in the animals. Studies have shown relations between longer photoperiods (16 hours of light per day) and elevated prolactin levels, and also between increased levels of the growth hormone bovine somatotropoin (BST) and longer photoperiods. Increased amount of …
