The Fertility Formula: Clinically proven supplement improves your mare's chances of conceiving this season

Breeding protocols typically focus on the reproductive tract. The uterus, the cervix, the timing of ovulation. The egg itself gets less attention. But it is in the egg, during the weeks before breeding, that the methyl donor reserves are built that the embryo will depend on in its first critical days [8].

This article is about that window. What methylation does during fertilisation and early embryo development, why nutritional preparation needs to start before breeding rather than after a failed cycle, and what Fresh&Fertile is designed to address.

What methylation does in a broodmare

Think of methylation as a set of molecular switches on thousands of genes. Each switch needs a small tag, a methyl group, to flip a gene to the right setting at the right time. Those tags come partly from the diet, in the form of methyl donors: folate, choline and betaine. When a mare runs short, the tags go missing. Genes that regulate the uterine lining, egg maturation and early embryo development may not express correctly. Often without any visible sign on a routine reproductive exam.

What happens at fertilisation and during embryo cell division

At the moment of fertilisation, the embryo's entire DNA methylation pattern is erased and rebuilt from scratch. The paternal genome is globally demethylated within hours of sperm entry. Both genomes then undergo a second wave of remethylation during the first cleavage divisions, laying down the gene-expression patterns that will govern every cell type the embryo will ever produce [6].

During this window the embryo has no external food source. It draws primarily on methyl donors stored in the egg before ovulation. Research in multiple mammalian species shows that when folate, choline and betaine are deficient at this stage, the reprogramming can be incomplete: imprinted genes are mis-set, cell division is compromised, and blastocyst development is impaired [7]. Supplementing folate during oocyte maturation has been shown to increase blastocyst production rates and reduce oxidative stress in the resulting embryos [8].

Folate's role in early cell division is well established across species. It is exactly why human prenatal care starts folate before conception rather than after [1].

Why you start before breeding, not after a failure

The three-month lead time matters because the oocyte that will be ovulated is already maturing weeks before it is released. Whatever methyl donor reserve the egg accumulates during that maturation period is what the embryo has to work with. Before it can source anything from the mare's bloodstream.

Waiting until a mare has failed to hold a pregnancy addresses future cycles. Not the one that just failed. Starting three months before breeding is not a response to a problem. It is standard prenatal preparation, the same way a body condition check or forage analysis is.

For a practical stage-by-stage guide to feeding a broodmare from pre-breeding through lactation, see What to feed your mare before, during and after pregnancy.

Where Fresh&Fertile came from

A few seasons back I was working with a mare that had failed to conceive for two years. Thorough reproductive workups, timed inseminations, hormone support. Nothing structural explained it. I had been studying phytotherapy and equine nutrition, and methylation kept coming up as a gap that standard feeding rarely closes. I built a prenatal mix around active folate, B vitamins, choline, betaine and broccoli sprout powder. She caught on the next cycle.

One result proves nothing. I said so at the time. But the same pattern came up with other mares, I refined the formula, and later partnered with Ghent University and veterinarian Eileen Geerinckx on a clinical trial of over 30 mares. It showed a significant positive effect on embryo development [3]. A trial of that size is encouraging, not conclusive, and I would rather say that clearly than oversell a single study.

"Most protocols obsess over the reproductive tract. A contributing factor can sit in the mare's whole-body metabolism, and that is something nutrition can actually address." Valerie, veterinarian, Curafyt

What the formula contains

Active folate as 5-methyltetrahydrofolate, the form the body can use directly without a conversion step. Choline and betaine as methyl donors alongside folate. Vitamin B12 and B6 as co-factors for DNA synthesis and homocysteine regulation [4]. Vitamin E as d-alpha-tocopherol for placental health [5]. Broccoli powder and flaxseed for hormonal and metabolic support.

What it does and does not cover

Fresh&Fertile is prenatal nutrition. It addresses a specific nutritional gap, methyl donor supply during oocyte maturation and early embryo development, that standard forage-based diets do not always close. It fits as part of pre-breeding preparation for any broodmare you want in foal.

It does not fix structural problems. Significant uterine scarring, a cervical issue or an active infection need a vet and targeted treatment. Fresh&Fertile has a role alongside a proper reproductive workup, not instead of one. And it works best started before the season, not after it.