Humans versus Bulls

by Charlotte Heavisides on 10 July 2020.

You will often hear us talk about ‘reference values’, these are the minimum optimum figures that we want to see to have the highest chance of success. For example, in order to have the best chance of pregnancy after natural service a bull will need to have a specific number of sperm cells in the semen.

Here are the comparisons of the reference ranges for Humans and Bulls for fresh (not frozen) semen.

Semen Volume (not much difference here)
Human Semen: 1.4-1.7 ml
Bull Semen: 2-10 ml

Semen Concentration (this is where the differences start)
Human Semen: 12-16 million per ml
Bull Semen: 400-750 million per ml

Total number of sperm in the ejaculate
Human Semen: 33-46 million
Bull Semen: 800-7500 (7.5 billion) million

Abnormalities (big difference here)
Human Semen: 4% of the sperm need to have a normal appearance
Bull Semen: 70% need to have a normal appearance

Human Semen: 38-42% of the sperm in the sample need to be swimming.
Bull Semen: 60-79% motile

*Please note that for comparison purposes we have used the ‘Good ranges’ for the bull semen.  Figures below the ranges in both humans and bulls will not necessarily result in zero success, the chances just may be reduced.

Bull Breeding Soundness (Third Edition), Albert D. Barth 2013
WHO laboratory manual for the Examination and processing of human semen, Fifth Edition 2010

Related articles

UK dairy farmers missing out on millions say AHDB

Dairy farmers could be missing out on £55 million a year in lost revenue by not meeting milk buyer requirements for butterfat and protein

UK Sires join forces with industry to help bust GHG myths
by Simon Gee

UK Sires has joined forces with the Royal Association of British Dairy Farmers (RABDF) and other industry stakeholders to help highlight accurate facts about greenhouse gas emissions from the sector ahead of the UN Climate Change Conference (COP26) in Glasgow at the end of October (31st Oct).