Biological boundaries are being crossed. Industrial agriculture’s relentless pursuit of rapid weight gain has collided with a startling biological anomaly: lactating steers actively producing milk at slaughter. While corporate feedlot interests dismiss this as a side effect of high-energy fat accumulation, regenerative farmer and advocate Mollie Engelhart is raising a crucial alarm: the phenomenon of lactating steers is a clear biological signal of a food system operating under artificial estrogen dominance.
The Science Behind Lactating Steers: WTAMU & Cargill Audit
In conventional beef production, steers (castrated male bovines) are raised for meat. Castration removes the primary testicular source of natural androgens like testosterone. Without male hormones to suppress tissue receptors, the steer’s rudimentary mammary tissue is left uniquely exposed to external estrogenic triggers.
A massive audit conducted by West Texas A&M University (WTAMU) animal scientists—co-authored with Cargill—evaluated 20,481 finished cattle across 33 feedlots. Titled “Outcomes of Unintended Consequences: Frequency of Lactation and Intact Males and Their Impact in Finished Cattle,” the survey revealed surprising rates of lactating steers at harvest:
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- Native Beef Steers: 14.55% found to be lactating steers at slaughter.
- Dairy-Cross Steers: 19.66% recorded as lactating steers at slaughter.
- Intact Bulls: Out of 10,221 male cattle evaluated, lactation was virtually non-existent (only 4 cases in the entire study, or 0.04%).
Dr. Ty Lawrence, Adiposity, and the Missing Control Group
Dr. Ty Lawrence was a central figure in bringing this data to light. As the West Texas A&M University (WTAMU) animal science professor who oversaw the landmark audit, he is listed as a co-author on the original study abstract. However, while he directed the study documenting lactating steers, Dr. Lawrence holds a fundamentally different perspective on why it is happening compared to regenerative farmers and consumer advocates.
The Adiposity Theory
Dr. Lawrence attributes the phenomenon entirely to carcass adiposity (body fat) rather than synthetic growth-promoting implants. His explanation is that modern conventional feedlots finish cattle to extreme levels of fatness to achieve historic rates of high-marbling beef (such as USDA Prime). Lawrence argues that this excessive accumulation of body fat acts as active estrogen-producing tissue, signaling the pituitary gland and triggering a biological cascade that leads to lactating steers.
The Core Debate and Lack of a Control Group
When journalist and rancher Mollie Engelhart questioned Dr. Lawrence directly about whether powerful synthetic estrogen implants were contributing, he stated, “Absolutely not, I do not think the hormones have anything to do with it. I think it’s adiposity”.
However, critics point out a major scientific limitation in drawing this conclusion: the study lacked a control group. As Dr. Lawrence acknowledged, 100% of the commercial feedlot cattle audited in the study had received synthetic growth implants. Because there were no never-implanted cattle finished to the same fat levels to compare them against, industry critics argue it is scientifically premature to completely vindicate the synthetic hormones. This “implants vs. adiposity” debate represents the central tension surrounding lactating steers—a direct clash between industrial feedlot science and regenerative agricultural observation.
Absolutely not, I do not think the hormones have anything to do with it. I think it’s adiposity.
Dr. Ty Lawrence
Growth Implants and the Rise of Lactating Steers
To understand why so many dairy-cross animals end up as lactating steers, one must examine standard feedlot hormone practices. Today, roughly 90% of conventional U.S. feedlot beef cattle receive synthetic growth ear implants.
As Engelhart notes, the Merck Veterinary Manual explicitly lists teat and udder development in both heifers and steers as a recognized adverse reaction to synthetic estradiol—the core compound used in most commercial beef implants. Furthermore, synthetic estrogen cocktails have long been used in livestock research to artificially induce lactation in non-pregnant animals.
- Estrogens: Estradiol-17β, Estradiol Benzoate, and Zeranol.
- Androgens & Progestins: Trenbolone Acetate (TBA) and Progesterone.
These implants yield substantial economic returns by boosting weight gains and feed efficiency. But while corporate feed companies measure success strictly by daily weight gains, biology registers the cost: castrated animals receiving heavy growth protocols transform into lactating steers, producing fluid containing real fat, protein, and lactose on the slaughter line.
Compounding Factors Creating Lactating Steers
Synthetic implants do not act in a vacuum. As Cargill and major packing houses oversee feed formulation, feedlot steers consume intensive diets of grain, corn, and soy. Beyond growth pellets, feedlot cattle are exposed to an environmental cocktail of estrogenic inputs that contribute to the emergence of lactating steers:
- Endocrine-Disrupting Herbicides: Chemicals like Atrazine and Glyphosate (Roundup) alter hormone pathways and upregulate aromatase—the enzyme that converts male androgens into female estrogens.
- Concentrated Diets: High-input rations lack the natural buffers found in pasture forage, leaving castrated animals vulnerable to systemic hormonal imbalance.
When we strip away male hormones through castration, implant synthetic estrogens, and feed heavy chemical rations, we create a compound “estrogen storm” that leads directly to lactating steers.
Reclaiming Biological Integrity: Know Your Farmer, Restore the Supply Chain
The reality of lactating steers in industrial feedlots serves as a stark biological alarm bell for our entire food system. When industrial operations prioritize rapid weight gain and feedlot throughput above natural livestock health, they resort to synthetic growth implants, aggressive grain finishing, and heavy chemical inputs that warp basic animal biology.
Reclaiming biological integrity extends far beyond what you pour in your glass—it starts with how livestock are raised across the board. Pasture-focused farmers and regenerative ranchers bypass this synthetic feedlot pipeline entirely to prevent issues like lactating steers. By allowing cattle to graze on pristine pastures without synthetic herbicides like Atrazine or Glyphosate, local farms produce unadulterated meat and dairy rich in natural bio-available nutrients, clean fats, and proteins—completely free of synthetic growth promoters or chemical residues.
Building a direct relationship with local farmers, shopping at regional farmers markets, and sourcing directly from farm stands is the most powerful vote you can cast for animal welfare and human health. When you know your farmer, you don’t have to guess what went into your food.
At FindingRawMilk.com, our mission extends beyond milk alone—we bridge the gap between conscientious consumers and biological sanity. We make it simple to locate vetted local farms, regenerative meat producers, raw milk dairies, and farm stands near you, empowering you to bypass the industrial supply chain and source real, unadulterated food directly from farmers you can trust.
Find real beef near youYour Sourcing Shield: Questions to Ask Your Local Dairy Farmer
Labels can be misleading—generic terms like “grass-fed” do not always guarantee a completely chemical-free operation. Building a direct relationship with a local farmer provides absolute transparency. Use this guide on your next farm visit to ensure your milk comes from a pristine, biologically sound system:
| Sourcing Topic | Why It Matters | Questions to Ask the Farmer |
| Hormones & Injections | Synthetic reproductive protocols and lactation stimulants alter natural cow endocrinology. | “Do you use artificial estrus synchronization protocols (CIDRs/prostaglandins) or recombinant bovine growth hormones (rBST) in your herd?” |
| Pasture & Herbicides | Synthetic sprays on grazing ground can introduce endocrine-disrupting residues like Atrazine or Glyphosate into raw milk. | “Are your grazing pastures sprayed with synthetic herbicides, and how do you handle weed pressure?” |
| Supplemental Feed & Soy | Concentrated grain mixes and soy feeds carry pesticide residues and highly concentrated phytoestrogens. | “Are cows 100% forage-fed? If supplemental grain is fed in the parlor, is it certified organic, non-GMO, and soy-free?” |
| Milking Schedule & Dry-Off | Milking late into gestation significantly raises natural steroid hormones (estrogen and progesterone) in milk. | “Do you practice traditional dry-off periods before calving, or are cows milked deep into pregnancy?” |
| Water & Herd Transparency | Agricultural runoff affects stock ponds and groundwater quality, leaching into cattle drinking supplies. | “Do you test well water for agricultural runoff, and can customers visit the farm to see grazing conditions firsthand?” |
The More You Know: From Feedlot Steers to Intersex Fish
The biological disruption seen in lactating steers does not stop at the feedlot fence. When agricultural runoff carries synthetic implant metabolites like trenbolone and estradiol, alongside endocrine-disrupting herbicides like atrazine, these compounds enter regional waterways.
Extensive research by environmental scientists and government wildlife studies shows that chemical pollution alters reproductive biology across aquatic ecosystems:
- Sex Reversal in Amphibians: Male frogs exposed to low concentrations of atrazine in agricultural river basins undergo complete sex reversal, developing functioning hermaphroditic or female reproductive organs.
- Intersex Fish Development: Male smallmouth bass and goldfish exposed to agricultural runoff exhibit testicular oocytes—growing female egg cells inside their male testes.
- Egg-Yolk Protein Synthesis: Just as castrated steers produce milk when exposed to synthetic hormone cocktails, male fish synthesize vitellogenin (an egg-yolk protein normally exclusive to females) in response to chemical exposure.
Lactating steers and intersex fish are two sides of the exact same coin: visible proof that synthetic growth promoters and agricultural chemicals alter basic reproductive biology across the entire food chain.
The presence of lactating steers in feedlots proves that industrial food production has pushed biological limits too far. At FindingRawMilk.com, our mission is to bridge the gap between conscientious consumers and biological sanity. We make it simple to locate vetted local farms, regenerative meat producers, raw milk dairies, and farm stands near you—empowering you to vote for animal welfare, bypass the industrial supply chain, and source real food directly from farmers you can trust.
Choose real food from real farms!
Original article on Acres USA and more on Mollie Engelhart: Sovereignty Ranch | Kiss The Ground
Author: Team FRM
The FindingRawMilk Team is dedicated to building the most comprehensive and transparent directory for raw milk enthusiasts. Our mission is to bridge the gap between local farms and consumers by providing verified listings, clear state-by-state legal guides, and educational resources. We believe in the importance of food freedom and strive to make sourcing high-quality, farm-fresh milk as simple as a single search.
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