Stefan Coman COMAN

Dr. Stefan Coman COMAN


Research Focus & Metrics

Academic Career Length

3Years (2024-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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11 September 2024 in Animals
Verified
Journal Article
Open access
PDF file
SCStefan Coman COMAN
Stefan Coman COMAN
DBDaniel Ionut Berean
Daniel Ionut Berean
RCRaluca Calina Cimpean
Raluca Calina Cimpean
SCSimona Maria Ciupe
Simona Maria Ciupe
ICIoan Coman
Ioan Coman
LBLiviu Marian Bogdan
Liviu Marian Bogdan
This review aimed to bring a comprehensive analysis of key clinical strategies for enhancing reproductive efficiency in buffaloes, a species that exhibit low reproductive performance under conventional reproductive management compared to that exhibited by cattle. It considers key ART techniques including estrus synchronization for artificial insemination, and ovulation induction, highlighting their role in improving fertility and overall herd productivity. However, it also addresses common postpartum inflammatory and functional reproductive disorders, discussing their diagnosis and treatment protocols, stressing their impact on the overall reproductive outcome in buffalo farming.

15 June 2026 in Applied Biosciences
Verified
Journal Article
Open access
PDF file
LBLiviu Marian Bogdan
Liviu Marian Bogdan
DBDaniel Ionut Berean
Daniel Ionut Berean
SCStefan Coman COMAN
Stefan Coman COMAN
IUIonela Delia Ut
Ionela Delia Ut
SCSimona Maria Ciupe
Simona Maria Ciupe
RCRaluca Călina Cîmpean
Raluca Călina Cîmpean
Reproductive efficiency is a critical determinant of productivity and profitability in both dairy and beef cattle systems. Progesterone-based estrus synchronization protocols have emerged as essential tools to control the timing of ovulation, enhance artificial insemination efficiency, and optimize herd reproductive performance. These protocols exploit the physiological regulation of the hypothalamic–pituitary–ovarian axis, maintaining elevated progesterone levels to suppress ovulation and coordinating luteolysis and follicular wave emergence through prostaglandins, GnRH analogues, and, in some cases, equine chorionic gonadotropin. In beef cattle, progesterone supplementation facilitates fixed-time artificial insemination, shortens calving intervals, and improves calf crop uniformity, whereas in dairy cows it mitigates poor estrus detection, enhances service rates, and reduces days open. Fertility outcomes are influenced by cow physiological status, metabolic condition, and protocol adherence, with pregnancy per AI typically ranging from moderate to high in beef cattle and lower in lactating dairy cows. Economic evaluation indicates that these protocols are cost-effective in herds with moderate to large size, low estrus detection efficiency, and intensive management, although labor, drug costs, and handling requirements must be considered. Critical analysis suggests that synchronization cannot compensate for underlying nutritional, health, or metabolic deficiencies, and future research should focus on precision application, individualized protocols, and integration with automated reproductive monitoring to improve both biological and economic efficiency. This review summarizes physiological principles, protocol designs, practical applications, fertility outcomes, and economic considerations of progesterone-based estrus synchronization in cows, highlighting current challenges and perspectives for enhanced reproductive management.

1 March 2025 in Animals
Verified
Journal Article
Open access
PDF file
SCStefan Coman COMAN
Stefan Coman COMAN
DBDaniel Ionut Berean
Daniel Ionut Berean
RCRaluca Călina Cîmpean
Raluca Călina Cîmpean
SCSimona Maria Ciupe
Simona Maria Ciupe
ICIoan Coman
Ioan Coman
LBLiviu Marian Bogdan
Liviu Marian Bogdan
Retained placenta (RP) in bovines is a significant postpartum complication that can lead to severe reproductive issues if not managed promptly