Level of estrogen and cervical mucus pH as indicator of estrus after calving towards the provision of seleniumvitamin E™ on dairy cow Frisien Holstein (FH)

This research was conducted to assess the effectiveness of selenium-vitamin E™ intramuscularly to the estrus condition after calving. The research conducted in Training Center of Animal Husbandry, Batu, East Java, Indonesia. Assessed indicator was on the level of estrogen in estrus and pH of cervical mucus on 20 dairy cows FH. Four treatments with repetition based on doses of selenium-vitamin E™ for control (P₀), treatment 1 (P₁): 0.5 mg/ml selenium + 50 mg vitamin E™, treatment 2 (P₂): 1.5 mg/ml selenium + 50 mg vitamin E™ and treatment 3 (P₃): 2 mg/ml selenium + 100 mg vitamin E™. Results showed that the average time of the returning estrus in control (P₀) is 123.25 ± 49.64 day, treatment 1 (P₁) is 50.8±27.38 day, treatment 2 (P₂) is 53.8±23.95 day and treatment 3 (P₃) is 71.4±13.66 day.The average result of estrogen levels during the first estrus is P₀7.81±0.95 pg/mL, P₁for 10.06±0.66 pg/mL, P₂ for 9.63±0.87 pg/mL and P₃for 10.14±0.84 pg/mL. pH of Cervical mucus in the first estrus after calving is P₀ for 6.6±0.41, P₁ for 8.8±0.83, P₂ for 8.4±0.89 and P₃ for 8.6±0.55. This study concludes that the provision of 0.5-1.5 mg/ml selenium and 50 mg vitamin E™ were significantly influence to the return of estrus after calving.