Using Genetics
Making the most out of genetics can be a challenging process. Below are several resources to help you understand and implement best genetic practices in your herd to maximise genetic gain.
Whether this is your first-time approaching genetics, or you regularly use genetic indexes for breeding decisions, this workbook will take you through the logic and theory behind making good breeding decisions to unlock your herd’s hidden breeding potential.
A guide to the tools that can improve genetics in your herd as well as identifying and prioritising the key breeding measures.
When selecting bulls to use on your herd we recommend using only those with a £PLI, £SCI or £ACI greater than the below figures:
| Index | Breed | Minimum for top 25% |
| £PLI | Holstein | 623 |
| Friesian | 197 | |
| Ayrshire | 362 | |
| Jersey | 282 | |
| Guernsey | 0 | |
| Shorthorn | 35 | |
| Montbeliarde | 227 | |
| Fleckvieh | 226 | |
| Brown Swiss | 234 | |
| £ACI | All | 384 |
| £SCI | All | 324 |
This table will be updated following each full UK genetic and genomic evaluation run in April, August and December. Current figures are calculated from April 2025 young genomic and daughter proven lists available from AHDB Dairy.
Video tutorials