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| The objective of this study was conducted to assess the potential associations between some physical properties of cervical mucus and pregnancy rate under heat stress condition. Estrous synchronization was done for 28 Egyptian cows and randomly assigned to either unheated stress group (UHS, n=14) or heated-stress group (HS, n=14). Afterward, estrus signs were observed for 30 minutes at 06:00 a.m. and 06:00 p.m. Blood and cervical mucus samples were collected (at the time of the first cervical mucus secretion) just before inseminating and to correlate the secretion pattern with pregnancy. Appearance, pH, and viscosity were observed and measured. The levels of progesterone and estradiol 17β, some biochemical profiles, and some macro-minerals levels were also determined in serum. Results showed that the percentage of cervical mucus samples that appeared transparent, thin consistency, and pH between 7-7.5 were higher in the UHS group than in the HS group. Also, estradiol, glucose, total protein, and cholesterol increase, while progesterone and sodium concentrations decrease with increasing mucus transparency and thin consistency with normal pH level (7-7.5) in both groups. It’s evident from our study that regardless of the effect of heat stress, the percentage of pregnant cows was extremely higher in cows that showed transparent vaginal fluids, and this percentage decreased in opaque fluids and reached 0.0 % with cows showed unclean mucus. Most of the serum components gained the best values of pregnancy rate when cervical mucus was transparent, thin consistency, and pH range between 7-7.5 under moderate weather conditions (UHS group). In conclusion, the appearance, viscosity, and pH of the cervical mucus are considered as useful tools in predicting the optimum time for inseminating in Egyptian cows with or without heat stress conditions.

The most Applicable Physical Properties of Cervical Mucus Correlated with High Pregnancy Rate in Egyptian Cows under Heat Stress Condition