SERVICES
Equine Reproduction and more...
Dr. Mariana Packer offers specialized veterinary services in equine reproduction, neonatology, sports medicine, stud management, and growth strategy, with more than 12 years of experience and a well-prepared team, who together total more than 100 years of experience and technical expertise. In addition, working in almost every country in the world, we ensure diversity and make risk our commitment, with planning, professionalism, and great respect.
Artificial Insemination
In artificial insemination, we keep risks calculated, ensuring perfect hormonal synchronization of ovulation individually through exclusive protocols, in addition to 24-hour monitoring, seven days a week. Here, there is no chance of losing ovulation regardless of the day or time; our ultrasound is always on. And our success comes from the use of fresh, cooled, or frozen semen—whatever our approach, it does not change, after all my goal is the same as yours: A HEALTHY FOAL ON THE GROUND!
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Artificial Insemination (A.I.) Success Rates:
2025 – 93% success
2024 – 84% success
2023 – 79% success
Embryo Transfer
In embryo transfer, we work with precision. This procedure requires greater attention, protocols, and experienced professionals, and that is exactly what we deliver every day to each client. Perfect hormonal synchronization between donor and recipient, in addition to closer monitoring not only with ultrasonography, but a complete evaluation of each mare from teeth to reproductive history, also including a full clinical examination. This way, we achieve greater control over the mare and truly expressive success rates.
Embryo Transfer (E.T.) Success Rates:
2025 – 89% success
2024 – 87% success
2023 – 85% success
Embryo Vitrification and Warm
​We work with embryo vitrification and devitrification using advanced protocols, precision, and strict quality control. Each step is carefully planned to preserve embryo viability and maximize post-thaw survival. Our experience and technical expertise ensure safety, consistency, and high success rates. The result is reliable outcomes and healthy embryos ready to develop.
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2025:
Post-devitrification survival: 73% sucess
Pregnancy rate after transfer of the devitrified embryo: 68% sucess D60
Initial embryonic loss rate: 7%
Andrology and Semen Freezing
Work in Equine Andrology goes far beyond simple semen collection. It begins with a complete evaluation of the stallion’s health, considering body condition, reproductive history, management, nutrition, and overall health status. Every detail directly influences semen quality and reproductive performance throughout the season. The evaluation of the reproductive system is conducted in a thorough manner, including clinical examination, palpation, ultrasonography when indicated, and functional analysis of the reproductive structures. The goal is to identify early any factor that may compromise fertility, allowing for strategic and personalized adjustments for each stallion.
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Semen evaluation is performed with a high level of technical rigor, analyzing essential parameters such as volume, concentration, motility, vigor, morphology, and cellular integrity. These data guide the best reproductive approach and ensure safety both for immediate use and for the storage of genetic material. According to the client’s demand and the defined reproductive strategy, I deliver doses of fresh, cooled, or frozen semen, always following protocols that preserve viability, fertility, and the stallion’s maximum genetic potential. Each step is designed to provide predictability, efficiency, and consistent results.
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This service is ideal for breeders seeking to optimize the use of the stallion, expand his genetic reach, and manage reproduction in a professional, safe, and strategically planned manner.
O.P.U. (Ovum Pick-Up)
O.P.U. (Ovum Pick-Up) is one of the most advanced and strategic procedures in modern equine reproduction, requiring technical precision, practical experience, and absolute control at every stage. The work begins with a thorough evaluation of the donor mare, considering reproductive history, clinical condition, management, and ovarian response, ensuring safety and predictability throughout the procedure. Oocyte collection is performed under carefully monitored sedation, following protocols that prioritize the mare’s well-being and the integrity of the biological material. Each step is conducted with refined technique, appropriate equipment, and full focus on preserving cellular quality.
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After collection, the oocytes are rigorously evaluated and managed according to the defined reproductive strategy. They may be vitrified for safe storage or immediately directed to in vitro maturation, proceeding to ICSI (Intracytoplasmic Sperm Injection). The choice of approach is always based on technical criteria, the client’s objectives, and the donor’s reproductive potential.
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This service is indicated for cases of high genetic value, donor mares with limitations to conventional reproduction, or when the goal is to maximize results in a shorter period of time. The combination of experience, safety, and professionalism allows for efficient work, reducing risks and delivering modern, reliable, and strategically planned reproductive solutions.
I.C.S.I. (Intracytoplasmic Sperm Injection)
I.C.S.I. represents the highest level of technology applied to modern equine reproduction, indicated for situations in which absolute precision, laboratory control, and technical expertise are decisive for success. It is a highly specialized procedure in which a single sperm cell is carefully selected and injected directly into the oocyte, ensuring fertilization even in cases of severely compromised fertility. The entire process is conducted in a controlled laboratory environment, following rigorous protocols that ensure safety, traceability, and maximum biological efficiency. Gamete selection, execution of the technique, and monitoring of embryonic development require in-depth knowledge, technical decision-making, and attention to detail that make all the difference in final outcomes.
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After embryo formation, the embryo may be vitrified, allowing the creation of a secure and strategic genetic bank, or transferred to a carefully selected recipient mare, respecting hormonal synchronization, uterine condition, and ideal reproductive criteria. Each decision is defined according to the client’s objectives and the genetic potential involved. I.C.S.I. is especially indicated for stallions with low semen quality, mares with challenging reproductive histories, or high-value genetic programs. The combination of practical experience, technical safety, and professionalism transforms this advanced biotechnology into a reliable, efficient, and strategically planned reproductive solution, aimed at those seeking consistent results and excellence in equine reproduction.
Neonatal Care and Foaling
The moment of foaling and the first hours of a foal’s life are, without a doubt, the most critical periods of the entire equine reproduction process. It is precisely within this short and decisive window that many breeders, even experienced ones, face insecurity, doubts, and losses that could be avoided with proper technical support. What seemed like a perfect pregnancy can change in minutes. Foaling rarely gives warning when something is not going well. Silent dystocia, abnormal presentations, delayed progression, fetal distress, and failures in neonatal adaptation occur more often than one might imagine—and when not recognized in time, they come at a high cost. This is where improvisation has no place. Time, clinical assessment, and the right decision make the difference between success and frustration. Neonatal care does not begin after birth, it begins before foaling.
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Evaluating the mare, anticipating risks, preparing the environment, guiding the stud staff, and being ready to intervene at the exact moment are what ensure a healthy start to the foal’s life. After birth, every detail matters: vitality, reflexes, proper colostrum intake, umbilical closure, respiratory and metabolic adaptation. Nothing can be left to chance. The Neonatal Care and Foaling service was structured for breeders who understand the value of what is being born at that moment. With presence, availability, refined clinical assessment, the use of apps for foaling prediction, artificial intelligence in management, and strategic care planning. This provides secure decision-making, delivering peace of mind to the breeder and safety to the foal. Each foaling is treated as unique, each foal as a project that deserves full attention from the very first minute of life.
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When everything goes well, it seems simple. When it does not, only those who live this every day know exactly what to do.
Stud Reproductive Management
Equine reproduction rarely fails due to a lack of genetics. It fails due to a lack of organization, strategic insight, and decision-making at the right time. Many breeders invest heavily in stallions, donor mares, biotechnologies, and staff, yet continue to face delays, embryonic losses, low efficiency, and costs that spiral out of control. The problem is almost never an isolated procedure, but rather the absence of a structured reproductive management system. Stud Reproductive Management was created precisely to address what concerns breeders the most, the lack of predictability. Without clear planning, the season passes quickly, opportunities are lost, recipients fail to synchronize, protocols overlap, and money drains away through simple but recurring mistakes. When everything is urgent, nothing is strategic. This service begins with a complete assessment of the stud’s reality, evaluating the herd, infrastructure, staff, commercial objectives, and operational capacity. From that point on, every decision has a purpose. The reproductive calendar, choice of biotechnologies, rational use of hormones, priority setting, cost control, and results monitoring cease to be intuitive and become technical.
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The key differentiator lies in connecting all sectors of reproduction. Donor mares, recipient mares, stallions, laboratory, management, nutrition, and health begin to operate as a single system. This reduces failures, anticipates problems, and significantly increases success rates without necessarily increasing investment. Reproductive Management also protects the breeder from one of the greatest risks of the season, making decisions too late. With continuous monitoring, data analysis, and real-time adjustments, the stud gains clarity to act with confidence, even in the face of unforeseen events. The result is greater efficiency, less emotional strain, and real control over the process.
This service is for those who understand that reproduction is not luck, it is applied strategy. And when someone takes responsibility for seeing the whole picture, anticipating scenarios, and guiding decisions with experience, the breeder can finally focus on what truly matters, watching the stud produce with consistency, peace of mind, and results.
International Consulting and Compliance
International Consulting and Compliance
Many breeders believe that producing at a high level depends only on good animals and good intentions. In practice, what separates an ordinary stud from one that is valued and internationally competitive lies in its structure, workflow, and the technical standard applied on a daily basis. This is exactly where the greatest flaws arise, often invisible to those who are inside the process. International Consulting and Compliance was created to solve what most limits the growth of a stud, a structure misaligned with the genetic level it possesses. Inadequate environments, improvised handling chutes, poorly designed laboratories, underutilized equipment, incorrect purchases of supplies, and decisions made without technical criteria generate unnecessary costs and drastically reduce reproductive efficiency. The result is frustration, rework, and lost money.
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The work begins with a deep assessment of the stud’s reality, whether it is already in operation or still in the project phase. Each consultation is personalized. I evaluate or build together with the client the entire system, the horses’ environment, handling flow, restraint chutes, laboratory, equipment, materials, and essential supplies so that the project operates smoothly, safely, and at the lowest possible cost, without compromising quality.
All consultations follow international standards, not as an abstract concept, but as applied practice. This means more efficient environments, clear protocols, reduced human error, better use of the team, and consistent reproductive results. This standard not only improves the internal functioning of the stud, it increases the stud’s market value, enhances credibility, and allows higher returns on what is produced.
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The breeder’s biggest mistake is trying to grow while maintaining the same structure. Growth requires technical adaptation and strategic vision. When a stud begins to operate within an international standard, it stops “trying to get it right” and starts working with predictability, control, and profit. This consulting service is for those who understand that structure is not an expense, it is an investment. And when someone takes responsibility for seeing every detail, anticipating problems, and aligning the project with what is most efficient worldwide, the breeder experiences something rare, clarity, security, and confidence that they are on the right path.