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Optimising Bovine Reproductive Efficiency: The Role of Multimin in Andrology and Embryo Transfer

For veterinarians specialising in ruminant reproduction, mitigating oxidative stress (OS) is paramount to maximising the viability of gametes and embryos. Both spermatogenesis and early embryogenesis are highly sensitive to reactive oxygen species (ROS) due to the high polyunsaturated fatty acid content in cell membranes and the intensive metabolic activity characterising these stages.

While oral trace mineral supplementation is standard practice, gastrointestinal antagonisms (e.g., from sulfur, iron, calcium and molybdenum) severely limit the bioavailability of critical micronutrients. The targeted administration of Multimin containing zinc (Zn), manganese (Mn), selenium (Se), and/or copper (Cu), and/or chromium (Cr), bypasses the rumen to rapidly elevate tissue and systemic mineral status. For andrologists and embryo transfer (ET) practitioners, integrating Multimin prior to critical physiological events offers significant, measurable benefits to both gamete quality and pregnancy retention.

Metalloenzymes and Reproductive Physiology

The efficacy of Multimin in reproduction is rooted in the upregulation of endogenous antioxidant enzymes. Copper, Zn, and Mn are required structural cofactors for superoxide dismutase (Cu/Zn-SOD in the cytoplasm/extracellular fluid; Mn-SOD in the mitochondria), which catalyses the dismutation of the superoxide radical into hydrogen peroxide. Selenium is the essential core of glutathione peroxidase (GSH-Px), which subsequently neutralises hydrogen peroxide into water.
Beyond OS modulation, these trace minerals exert direct actions on reproductive function:

  • The "Zinc Spark": In the female, zinc is critical for oocyte activation. Upon fertilisation, a sequence of Zn exocytic events modifies the zona pellucida, effectively preventing polyspermy and supporting early embryo development.
  • Steroidogenesis: Manganese is a crucial cofactor in the synthesis of cholesterol, the primary precursor to progesterone, thereby supporting corpus luteum (CL) function and pregnancy maintenance.
  • Sperm Architecture: Selenium is required for phospholipid hydroperoxide glutathione peroxidase (PHGPx), a structural protein in the sperm midpiece essential for normal mitochondrial function, flagellar stability, and motility.

 

Applications in Andrology: Semen Quality and Bull Fertility

The timeline of bovine spermatogenesis averages 61 days. Administering Multimin 60 to 90 days prior to a breeding soundness examination (BSE) or semen collection period ensures these essential trace minerals are incorporated throughout the entire cycle of sperm development.

Enhanced Motility, Morphology, and Concentration: In a trial involving developing 7-month-old beef bulls, the administration of Multimin at weaning and 90 days later resulted in significant improvements in sperm morphology and motility by 12 months of age (p<0.05) (Preedy et al., 2018). Among bulls that initially failed their BSE at 10 months, 98% of the ITM-treated bulls passed a subsequent BSE at 12 months, compared to 94% of saline-treated controls (p=0.10). In mature normospermic bulls, treatment with Multimin resulted in a 22% higher sperm concentration (p<0.05) and an increase in progressive motility (p<0.05) compared to controls 6 to 8 weeks post-injection (Durel et al., 2016).

A two-year study evaluating developing, yearling Angus bulls demonstrated that implementing trace mineral homeostasis via Multimin significantly enhances reproductive markers. When subjected to a standard control diet, Multimin-treated bulls achieved significantly higher semen motility scores compared to untreated controls in both years of the trial (scoring 4.33 versus 2.03 on a 5-point scale in year two; p<0.01)

Acrosome Integrity and DNA Viability: Low-fertility bulls often exhibit poor acrosome integrity, a metric not standardly evaluated in a basic BSE but vital for fertilisation success. In a recent trial at the Rosevale Santa Gertrudis Stud, flow cytometry utilising FITC-PNA stains revealed a significantly higher number of viable, acrosome-intact cells (+6.85%) (p<0.05) in sperm samples from bulls treated with Multimin 60 to 90 days prior to assessment (Virbac trial - data on file).

Applications in Embryo Transfer and Female Reproduction

Trace mineral demand surges during follicular recruitment, superovulation, and the establishment of pregnancy. Integrating Multimin into synchronisation and ET protocols yields marked improvements in embryo quality and recipient conception rates.

Improving Embryo Quality in Superovulated Donors: A study conducted on dairy heifers evaluating the impact of Multimin injected concurrently with the initiation of a standard superovulation protocol demonstrated positive shifts in embryo parameters. At the day 7 non-surgical flush, heifers treated with the ITM yielded a higher proportion of Quality 2 embryos (p=0.08) and showed a tendency for a greater proportion of advanced developmental stages (Stage 4 and Stage 5 embryos; p=0.09 and p=0.11 respectively) (Boas et al., 2016).

Maximising Recipient Conception and Embryo Survival: A highly relevant trial for ET practitioners evaluated the use of Multimin in Bos indicus x Bos taurus embryo recipients. Heifers received a Multimin injection 17 days prior to Timed Embryo Transfer (TET). While synchronisation rates did not differ, the ITM group achieved a 48% conception rate at 23 days of gestation versus 36% in the control group (p=0.015). By day 48, the pregnancy rate remained significantly higher in the treated group (43% vs. 30%; p=0.005), indicating that Multimin effectively reduced early embryonic mortality and improved overall embryo survival (Sales et al., 2011).

Boosting TAI Conception and Anestrus Recovery: Strategic Multimin administration 30 days prior to Artificial Insemination (AI) consistently improves conception outcomes. In a study of grazing beef cows, Multimin administered 30 days pre-TAI yielded a 60.2% conception rate compared to 51.2% for controls (p=0.05), resulting in a significantly compressed calving distribution (Mundell et al., 2012). Similarly, a New Zealand study (not published yet) assessing 4,040 dairy cows enrolled in a non-cycling cow (NCC) program found that administering Multimin at CIDR insertion (start of the NCC program) resulted in an 8% higher daily conception rate (p=0.035) across the mating period, culminating in a 2.2% greater final pregnancy rate (p=0.045) and a significant reduction in days open.

 

Clinical Recommendation

For veterinary practitioners looking to optimise herd fertility, a strategic 1 mL/100 kg subcutaneous injection of Multimin is recommended:

  • Bulls/Semen Donors: 60 to 90 days prior to semen collection or breeding season to align with the spermatogenic cycle.
  • Donors/Recipients (Females): 30 days prior to AI, ET, or the initiation of a superovulation/synchronisation protocol to optimise oocyte quality, CL steroidogenesis, and uterine immune environment.

References:
Ferreira, G.M., Annandale, C.H., Smuts, M.P. and Holm, D.E., 2022. The potential effects and interactions of oxidative stress and trace minerals on fresh and frozen semen in bulls–a review. Journal of the South African Veterinary Association, 93(2), pp.70-75.
Ferrer, M., Palomares, R. and Maldonadox-Estrada, J., 2024. Role of trace minerals in bull reproductive physiology and semen quality. Clinical Theriogenology, 16.
Hartman, S.J., Genther-Schroeder, O.N. and Hansen, S.L., 2018. Comparison of trace mineral repletion strategies in feedlot steers to overcome diets containing high concentrations of sulfur and molybdenum. Journal of Animal Science, 96(6), pp.2504-2515.
Multimin Technical Manual, 2020
Palomares, R.A., 2022. Trace minerals supplementation with great impact on beef cattle immunity and health. Animals, 12(20), p.2839.
Palomares, R., Ferrer, M. and Jones, L., 2024. Role of trace minerals in cow’s reproductive function and performance: a clinical theriogenology perspective. Clinical Theriogenology, 16.