Vol. 7, Issue 8, Part C (2025)

Sex-sorted semen has emerged as a strategic reproductive technology for accelerating genetic gain and optimizing herd replacement in dairy production systems. However, conception success with sex-sorted semen remains lower than with conventional semen, particularly under sub-temperate agro-climatic conditions where physiological stressors interact with animal biology. The present research examines key biological determinants influencing conception success in dairy cattle inseminated with sex-sorted semen under sub-temperate environments. Emphasis is placed on intrinsic animal factors including age, parity, body condition score, ovarian activity, estrus expression, hormonal balance, uterine health, and genetic adaptability. Sub-temperate regions are characterized by seasonal temperature fluctuations, variable humidity, and altered photoperiods, all of which can influence endocrine regulation and reproductive efficiency. Reduced sperm concentration and increased susceptibility of sex-sorted spermatozoa to environmental and physiological stress further compound fertility challenges. Understanding how biological parameters interact with these constraints is critical for improving reproductive outcomes. This research synthesizes evidence from controlled trials and field-based observations to identify biological thresholds associated with improved conception rates. Particular attention is given to follicular dynamics, timing of insemination relative to ovulation, metabolic status, and postpartum recovery, which collectively determine uterine receptivity and embryo survival. By integrating biological indicators with reproductive management, the research aims to provide a biologically informed framework for optimizing the use of sex-sorted semen in sub-temperate dairy systems. The findings are expected to assist veterinarians, reproductive biologists, and dairy farmers in refining animal selection and insemination strategies. Ultimately, improving conception success through biological optimization will enhance economic sustainability, reduce insemination costs, and promote wider adoption of sex-sorted semen technology in environmentally sensitive dairy regions while supporting long-term herd productivity goals globally.