Jersey Familiar names amongst the bulls suited for use in spring block calving were published in AHDB Dairy index throughout the year for the increasing numbers of herds which choose the block calving option. Grazing based herds include the Jersey, Danish VJ Tester, who retains his number one position amongst proven sires of all dairy breeds, with a Spring Calving Index (SCI) of £462. The number two sire is the first in a run of Holsteins, in the shape of Progenesis Unicorn. Also taking second place in the previous (December 2020) run, he now has an SCI of £447. Third place is taken by the newcomer, VH Balisto Brixton, whose low maintenance feed costs and low daughter cell counts contribute to his SCI of £439.