• Optomega is a high quality concentrated EPA and DHA product produced from sustainable fish oils.
  • When included in bull rations, Optomega can help to enhance mobility and viability of sperm.
  • Spermatozoa production takes place between 6-8 weeks in bulls.
  • High quality semen is vital to ensure successful inseminations and pregnancy following natural servings in all livestock.

A trial was carried out at the Islamic Azad University in Iran to assess the efficacy of Optomega, a source of EPA and DHA, on bull semen quality. 20 Holstein bulls were randomly allocated to one of two treatments.

1. Control diet.
2. Control diet + 100g/day of Optomega.

Semen samples were collected following 0, 5, 9 and 12 weeks of supplementation. Motility, viability and membrane integrity (hypo-osmotic swelling test (HOST)) assessments were made with both fresh and frozen/thawed semen samples.


Graph showing effect of Optomega on bull spermatozoa in fresh semen at 9 weeks

Gholami et al., 2010, Theriogenology 74:1548

Figure 1. Effect of Optomega on bull spermatozoa in fresh semen at 9 weeks. This considered to be the most relevant time point during the trial due to the 6-8 weeks required for spermatozoa production in bulls
(* denotes significant difference to control p<0.05).

  • Total semen volume and sperm concentration per ejaculate were not affected.
  • After 9 weeks, the motility, velocity, HOST and proportion of rapid spermatozoa were all increased in fresh semen, with fewer static spermatozoa.
  • After 12 weeks, the proportion of spermatozoa was significantly increased.
  • Post-thaw, there was no difference between treatment, though motility and HOST values were halved when semen was frozen and thawed.


Therefore, Optomega included in the daily ration of bulls can improve semen quality and motility.