In the United Kingdom a report of the NMR based on data from 500 NMR-recorded Holstein Friesian herds for the year ending August 2023 shows annual trends in herd health from 2010 to 2023. In this period 70 percent of herds had a somatic cell count (scc) below 200000 cells per millilitre in the year ending August 2023. This was an improvement from 44 percent in 2010. In 2023 of all cows in the 500 herd sample 52 percent completed their lactations without recording a single high scc above 200000. The equivalent figure in 2010 was 35 percent of the cows. Mastitis incidence across a 242 sample of the 500 recorded herds averaged 22 cases per 100 cows per year, a reduction of 14 cases per 100 cows per year since 2016. In half the herds (with mastitis records) 85 percent of cows recorded no mastitis in completed lactations. This was an increase from 79 percent in the same period. Fertility improved also. Since 2010 the mean age at first calving decreased by 89 days to 804 days. Since 2022 it has increased by five days. Milk yields remained stable for the past five years, averaging 8737 kilogram in 2023. This was up from 8708 kilogram in 2022 and by more than 1000 kilogram on 2010 data. Lifetime milk per cow per day increased by 25 percent from 10.5 kilogram in 2010 to 12.7 kilogram in 2023. Milk fat content has increased from 3.35 percent in 2010 to 4.26 percent in 2023 and is up from 4.18 percent in 2022. Protein content has risen from 3.33 percent to 3.36 percent since 2022, up from 3.27 percent in 2010.