Bomaz Fynn, a young Holstein bull boasting high fat figures, has stepped up to take the No 1 position in sire in the new genomic sire rankings, published this week.

With a Profitable Lifetime Index of £878, Fynn breaks the 50kg fat barrier for the first time in a top 20 sire, meaning that his daughters are predicted to yield 50kg more fat during their lactations than the national average cow. A Frazzled son from a Rubicon dam, he also features +0.13% fat, great udder health (-30 SCC, -3 Mastitis) and one of the highest Type Merit scores at the top of this £PLI list (+2.43 TM).

The new sire listings from AHDB Dairy show Denovo 14566 Crosby has moved up to second place, also with solid Predicted Transmitting Abilities (PTAs) for production and the highest Lameness Advantage of the top 20 bulls. This high-ranking son of DG Charley, again from a Rubicon dam, has a PLI of £871.

Also making gains is Melarry Frazz Arrowhead, which now ranks third with a PLI of £870. Another Frazzled son with excellent daughter maintenance scores (-10) and good SCC (-33), he is also the best improver of daughter fertility in the top 20 (+14.2). His survival scores are also good, with a strong +3.3 calf survival (aided by the best calving ease prediction in the top 10) and excellent daughter Lifespan Index (LS).

Expressed on a new scale for the first time (See article on previous page) with this index run, his LS of +219 days means his daughters are predicted to live, on average, 219 days longer than the average cow.

The former No 1 sire, Bomaz AltaCabot, continues to show excellent PTAs for milk quality at +0.17% fat and +0.06% protein. Low cell counts and great mastitis resistance (-4) help earn him a PLI of £867.

Peak AltaLeap climbs to No 5 with a PLI of £860, also transmitting good mastitis resistance (-4) and the longest daughter lifespans in the top 20 at 237 extra days of life.

A new entry in sixth place is Dutch-bred Velder Starmaker (PLI £852). This son of Adorable transmits one of the best survival ratings in the top 20 (+3.5 calf survival, +222 cow lifespan) and has solid figures for daughter fertility (+12.2).

Joint in seventh place with PLIs of £848 are Progenesis Monet, Denovo Invictus and Denovo 15158 Admiral.

Monet transmits by far the highest weight of milk and protein in the top 20 at +1263kg and +37.1kg respectively as well as a favourable Mastitis Index (-4).

Invictus stands out for Lifespan Index (+228 days) and daughter fertility (+13.1), while Admiral is a fat production specialist (+49.2kg, +0.19%).

Rounding off the top 10 is Peak AltaZarek (PLI £847), with one of the best scores for Lameness Advantage (+3.6), strong production figures and over two points for type.

Just outside the top 10 are two level-pegging UK-bred half-brothers, Glamour Boghill Victor and Boghill Glamour Persuade. Both are out of the Supershot x Numero Uno dam from the Larcrest Cosmopolitan family and both excel for protein transmission, also offering good daughter fertility and long lifespans. Their PLIs are £841.

Two remaining new entries in the top 20 are 15th ranking Hul-Stein Party Time (PLI £839) and 17th placed Prismagen Grande Rio (PLI £830). Party Time’s strengths are built largely around production while Grande Rio excels for daughter health.

Marco Winters, head of animal genetics with AHDB Dairy says: “It’s no surprise that the leading bulls transmit excellent daughter health and fertility but it’s of particular note that these cows are also predicted to enjoy long lifespans.

“Daughter Lifespan is one of the most important individual indexes producers should consider when choosing their bulls, and the new scale which takes effect this month, helps indicate to benefits of doing so.

“On the new scale, we see figures range from 158 to 237 days amongst the top 10 bulls, which means their daughters are predicted to live from 158 to 237 days longer than the national average cow.

“This is such an important trait from a management, financial and a welfare perspective that I would urge breeders to build it into their breeding objectives,” he says.

Top 20 Holstein bulls with genomic indexes ranked on Profitable Lifetime Index (£PLI)

Rank £PLI Bull name £PLI Rel% Milk kg Fat kg Ptn kg Fat % Ptn % SCC Mast LA CS LS FI dCE % DCI Maint TB Adv TM Sire x maternal grandsire Supplier GB/NI

1 878 BOMAZ FYNN 64 997 51.0 32.4 0.13 0.00 -30 -3 2.6 1.9 183 6.3 0.2 1.6 2 1.1 2.43 Frazzled x Rubicon GEN

2 871 DENOVO 14566 CROSBY 64 1035 42.5 33.2 0.02 0.00 -28 -3 3.6 2.4 201 7.8 0.1 1.5 -1 1.7 1.37 Charley x Rubicon GEN

3 870 MELARRY FRAZZ ARROWHEAD 64 763 36.7 25.4 0.08 0.01 -33 -3 1.5 3.3 219 14.2 0.8 1.2 -10 0.9 0.89 Frazzled x Profit WWS

4 867 BOMAZ ALTACABOT 65 777 45.4 30.2 0.17 0.06 -28 -4 2.8 1.5 158 6.7 0.1 1.9 -7 0.9 1.86 Altatopshot x Cabriolet ALT

5 860 PEAK ALTALEAP 64 865 31.8 33.7 -0.03 0.07 -32 -4 2.1 1.8 237 10.3 -1.0 2.4 9 1.6 2.03 Quantum x Altaspring ALT/AIS

6 852 VELDER STARMAKER 63 631 30.2 26.6 0.06 0.07 -36 -4 3.0 3.5 222 12.2 0.1 2.0 7 1.7 1.71 Adorable x Mobile CRV

7 848 PROGENESIS MONET 63 1263 41.0 37.1 -0.10 -0.04 -29 -4 2.9 2.4 204 7.4 -1.0 0.8 7 1.6 1.44 Guarantee x Jedi SMX

7 848 DENOVO INVICTUS 63 839 37.7 28.1 0.05 0.01 -24 -2 2.2 0.5 228 13.1 -0.6 1.2 -8 0.6 1.43 Achiever x Supershot GEN

7 848 DENOVO 15158 ADMIRAL 64 823 49.2 27.5 0.19 0.01 -24 -3 2.2 0.5 201 7.5 0.5 0.8 -6 -0.3 1.84 Torque x Yoder GEN

10 847 PEAK ALTAZAREK 65 1072 42.0 32.3 0.00 -0.03 -26 -3 3.6 1.4 207 8.6 0.6 2.7 4 -0.5 2.18 Altatopshot x Rubicon ALT/AIS

11 846 DENOVO 8084 ENTITY 63 955 48.2 30.4 0.12 -0.01 -18 -3 1.3 2.4 186 10.5 0.3 1.2 3 -0.2 1.28 Matters x Rubicon GEN

11 846 DE-SU 14673 APPEAL 63 699 38.6 27.1 0.13 0.05 -24 -2 1.5 -0.2 210 13.4 -0.1 0.8 -5 0.7 2.48 Achiever x Dozer GEN

13 841 GLAMOUR BOGHILL VICTOR 64 949 31.6 33.7 -0.07 0.03 -27 -3 1.8 2.3 198 10.4 -1.0 2.4 -7 0.9 0.97 Verona x Supershot GEN

13 841 BOGHILL GLAMOUR PERSUADE 64 982 27.3 33.8 -0.13 0.02 -27 -3 2.5 1.1 219 13.4 0.1 1.2 -3 1.1 1.08 Perseus x Supershot GEN

15 839 HUL-STEIN PARTY TIME 63 919 44.2 33.4 0.09 0.04 -17 -1 2.2 2.5 183 5.4 0.3 1.0 -8 0.4 1.74 Imax x Profit GEN

16 835 DE-SU FRAZZLED ROME 14192 64 829 43.0 28.5 0.12 0.02 -35 -3 2.1 1.9 186 9.3 -1.0 1.4 -2 1.0 1.75 Frazzled x Yoder WWS

17 830 PRISMAGEN GRANDE RIO 63 965 36.8 28.1 -0.01 -0.04 -29 -3 1.8 0.4 210 11.5 1.0 0.4 -16 1.7 1.28 Franchise x Kerrigan GEN

18 827 DENOVO 7921 ATRIUM 63 657 40.5 24.1 0.17 0.03 -25 -3 1.5 0.4 195 12.6 0.4 0.8 -12 0.9 1.64 Achiever x Delta GEN

19 824 ABS CRIMSON 63 934 48.3 30.0 0.13 0.00 -22 -2 2.4 0.9 198 10.4 -1.6 2.7 6 1.0 1.58 Spectre x Rubicon GEN

20 823 MR RUBI-AGRONAUT 73287 65 442 38.6 22.4 0.26 0.10 -30 -3 1.0 -0.8 234 12.9 -0.1 0.6 2 -0.3 2.61 Rubicon x Shotglass CBL

AIS = AI Services; ALT = Alta; CBL = Cogent Breeding; CVR = CRV Avoncroft; GEN = Genus ABS; SMX = Semex; WWS = World Wide Sires. £PLI = Profitable Lifetime Index; SCC = Somatic Cell Count; Mast = Mastitis; LA = Lameness Advantage; CS = Calf Survival; LS = Lifespan; FI = Fertility Index; dCE% = direct Calving Ease; DCI = Dairy Carcase Index; Maint = Maintenance; TB Adv = TB Advantage; TM = Type Merit.