Analys av juverhälsodata från kärnbesättningen Viken

摘要: Notcenter Viken is a Swedish nucleus herd for dairy cattle. The goal the farm to select suitable mothers next top generation of bulls. Today selection udder health based on pedigree index and phenotype data. cow's father grandfathers breeding values. In this study values have been estimated with animal models which also account cows own performance. Breeding in Sweden today are lactation averages. To be able estimate value cow she needs complete 305 days lactation. A mean that represents whole used value. An alternative method test-day model. With model can without registrations from aim was these two somatic cell count. correlation pedigree-index compiled. One other important part see how available data collected at could further research. literature review survey different ways measure improve Most common use mastitis registrations, count type traits. Other possible measurements electric conductivity milk milking speed. All were Vikendata an on-farm-recording system Viken. From information about: pedigree, calving, counts, trait, speed collected. Half Red half Holstein. All born after 2002 had their first Only 261 longer than 90 days. For average additional 45 but reasons shorter These only obtained The geometric 2005/2006 183 000 cells/ml milk. 306 participating 91 cells/ml. Effects mastitis, lactation, number calving season all significant factors. Cows some point during significantly higher counts those not mastitis. Calving summer resulted moderately lower compared seasons. It note did take into consideration breed, year or age calving. The between high: 0.92. Both much -0.16 -0.26 scales explain negative favourable correlations. Highest phenotypic correlations found traits fore attachment depth (0.56). Pedigree has limited as aid herd. same grandfather receive results taken account. better rank