Pesticides and herbicides used on farms contain chemicals that can interfere with how hormones work in the body, affecting reproduction in livestock, wildlife, and potentially humans. These chemicals don’t stay where they’re sprayed—they spread through soil and water, accumulate in plants and animals, and can enter our food chain. This comprehensive review examines how common farm chemicals like organophosphates, neonicotinoids, atrazine, and glyphosate move through the environment, how long they persist, and what damage they cause to reproductive systems. The research highlights an important gap: we don’t fully understand how these chemicals affect farm animals’ ability to reproduce, and we need better testing to consider their combined effects on all living things.
The Quick Take
- What they studied: How pesticides and herbicides used in farming interfere with hormone systems and reproduction in animals, wildlife, and potentially humans, and how these chemicals spread through soil, water, and food chains.
- Who participated: This is a review article that analyzed existing research on pesticide exposure in livestock, wildlife, and humans rather than conducting a new experiment with human or animal participants.
- Key finding: Common farm chemicals—including organophosphates, carbamates, pyrethroids, neonicotinoids, atrazine, and glyphosate—were found to disrupt reproductive function by interfering with hormone production and causing cellular damage in both males and females across multiple species.
- What it means for you: The chemicals used to protect crops may have unintended consequences for reproduction in farm animals and wildlife, and potentially in humans through food consumption. This suggests we need better safety testing and monitoring of these chemicals, though more research is needed to fully understand the risks.
The Research Details
This is a comprehensive review article, meaning the researchers examined and summarized all available scientific studies on how pesticides affect reproduction and ecosystems. Rather than conducting their own experiment, they looked at what other scientists have discovered about specific pesticides—including organophosphates (older insecticides), carbamates (insecticides), pyrethroids (synthetic insecticides), neonicotinoids (newer insecticides), atrazine (herbicide), and glyphosate (herbicide like Roundup). They focused on understanding how these chemicals move through the environment, how long they persist, how they accumulate in living things, and what reproductive problems they cause.
The researchers consolidated information about how these pesticides break down in soil, water, and other environments, and identified their metabolites (breakdown products). They examined both direct effects on reproductive organs and indirect effects through hormone disruption and cellular damage. The review covered impacts on terrestrial (land-based) and aquatic (water-based) ecosystems, as well as effects on livestock, wildlife, and humans.
A review article is valuable because it brings together scattered research findings into one comprehensive picture. Individual studies might examine one pesticide or one species, but a review helps us see patterns across many studies. This approach is important for understanding complex problems like pesticide exposure, where effects may be subtle, take time to appear, or involve multiple chemicals acting together. By consolidating what we know, the review identifies gaps in our knowledge—in this case, the lack of understanding about how these chemicals affect farm animal reproduction.
This review was published in a peer-reviewed journal (Reproduction & Fertility), meaning other experts reviewed it before publication. However, as a review article, its conclusions depend on the quality of the studies it examined. The strength of the findings varies—some pesticides have been well-studied while others have less research. The authors acknowledge that more research is needed, particularly on how multiple pesticides together affect reproduction. The review’s value lies in identifying what we know and what we don’t know rather than providing definitive answers.
What the Results Show
The review found strong evidence that six major classes of pesticides and herbicides disrupt reproductive function through multiple mechanisms. Organophosphates and carbamates (older insecticides) interfere with nerve signaling and hormone function. Pyrethroids (synthetic insecticides) and neonicotinoids (newer insecticides) affect hormone production and cause cellular damage through oxidative stress (a type of cellular injury). Atrazine (a common herbicide) and glyphosate (Roundup) both disrupt hormone systems, with atrazine particularly affecting male reproductive development and glyphosate causing cellular damage.
These chemicals don’t just affect the animals directly exposed to them. They spread beyond where they’re applied, moving through soil into groundwater and surface water. They accumulate in plants and animals, meaning concentrations can increase as they move up the food chain. This means livestock grazing on contaminated pastures, wildlife drinking from polluted water, and humans eating contaminated food can all be exposed.
The reproductive problems documented include reduced fertility, abnormal development of reproductive organs, decreased sperm quality, hormonal imbalances, and reduced offspring survival. These effects were observed across multiple species—insects, fish, amphibians, birds, and mammals—suggesting a widespread problem in agricultural ecosystems.
The review identified several important secondary findings. First, the breakdown products of pesticides (metabolites) can sometimes be more harmful than the original chemical, yet these are often not tested for safety. Second, the persistence of these chemicals varies—some break down quickly while others remain in the environment for years, continuing to cause exposure. Third, the cumulative effect of multiple pesticides together is poorly understood; most safety testing examines one chemical at a time, but farms typically use many different pesticides. Fourth, the effects on ecosystem health are interconnected—when reproductive function is impaired in key species, it can disrupt entire food webs and reduce agricultural productivity.
This review builds on decades of research showing that certain chemicals can disrupt hormone systems. Previous studies identified individual pesticides as problematic, but this review is the first to comprehensively consolidate information about how these chemicals behave in agricultural environments, how they persist and break down, and how their metabolites affect reproduction. It advances our understanding by showing that this isn’t an isolated problem with one or two chemicals, but a widespread issue affecting multiple classes of pesticides. The review also highlights that while we know these chemicals cause problems, we have significant gaps in understanding their effects on farm animals specifically, which is important because livestock are a major food source.
The review has several important limitations. First, it’s based on existing research, so its conclusions are only as strong as the studies available. Some pesticides have been extensively studied while others have minimal research. Second, most studies examine individual pesticides in controlled laboratory settings, which may not reflect real-world exposure where animals encounter multiple chemicals simultaneously. Third, the review focuses on what we know about reproductive effects but acknowledges that long-term health consequences and effects on future generations are not fully understood. Fourth, the mechanisms by which pesticides affect reproduction are complex and not completely understood for all chemicals. Finally, the review doesn’t provide specific risk levels for humans—it identifies potential hazards but can’t quantify how much exposure is actually dangerous in real-world situations.
The Bottom Line
Based on this review, several evidence-based recommendations emerge: (1) Improve safety testing of pesticides to include their breakdown products and combinations of chemicals, not just individual active ingredients—moderate confidence, as this is a logical improvement but requires new research; (2) Monitor pesticide residues in agricultural soils, water, and food products more systematically—moderate to high confidence, as this would help identify exposure pathways; (3) Consider alternatives to chemical pest management where feasible, such as integrated pest management that combines multiple approaches—moderate confidence, as effectiveness varies by situation; (4) Conduct more research specifically on how pesticide exposure affects livestock reproduction—moderate confidence, as this is an identified knowledge gap. These recommendations are appropriate for policymakers and farmers rather than individual consumers.
This research matters most to: farmers and agricultural professionals who can make decisions about pesticide use; policymakers who regulate pesticides; food producers concerned about product safety; people living near agricultural areas where pesticide drift may occur; and consumers interested in food safety and environmental health. People with concerns about reproductive health or those planning pregnancy may want to be aware of this research, though individual risk depends on exposure levels. This research is less immediately relevant to people living in urban areas far from farms, though they may still consume food grown with these pesticides.
The effects described in this review—reproductive dysfunction, hormonal disruption, and cellular damage—can occur relatively quickly with high exposure, but may develop slowly with low chronic exposure. Some effects may not appear until the next generation. Changes in agricultural practices would likely take years to show measurable improvements in ecosystem health and livestock reproduction. Individual exposure reduction (such as choosing organic food) might reduce personal risk, but the timeline for health benefits would depend on baseline exposure levels.
Want to Apply This Research?
- Track pesticide exposure sources: record which produce items you purchase (noting conventional vs. organic), track any direct pesticide exposure (yard treatments, gardening products), and monitor any reproductive health concerns or symptoms. This creates a personal exposure profile over time.
- Users can reduce pesticide exposure by: prioritizing organic versions of high-pesticide crops (strawberries, spinach, apples), washing conventional produce thoroughly, choosing organic dairy and meat when possible, and avoiding unnecessary pesticide use in home gardens. Start with one category and expand gradually.
- Long-term tracking should include: quarterly reviews of pesticide exposure sources, annual assessment of any health changes, tracking of food choices and their pesticide content, and monitoring of environmental factors (water quality if near agricultural areas). This helps identify patterns and measure the impact of behavior changes over time.
This review summarizes scientific research on how pesticides may affect reproduction and hormone systems. It is not medical advice. If you have concerns about reproductive health, fertility, or pesticide exposure, consult with a healthcare provider or environmental health specialist. This research identifies potential risks but does not establish definitive danger levels for human exposure. Decisions about pesticide use, food choices, or medical treatment should be made in consultation with qualified professionals. Pregnant women, those planning pregnancy, or individuals with reproductive concerns should discuss pesticide exposure with their healthcare provider.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.