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Author: Hasan, Moinul × End date: 2019 × Start date: 2018 × Type: Journal Article ×

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    Monitoring vaginal electrical resistance, follicular waves, and hormonal profile during oestrous cycle in the transition period in Bangladeshi sheep
    Talukder, MRI ; Hasan, M ; Rosy, TA ; Bari, FY ; Juyena, NS (WALTER DE GRUYTER GMBH, 2018-12)
    INTRODUCTION: The ovarian follicular dynamics, vaginal electrical resistance (VER), progesterone (P4) and oestrogen (E2) profiles were investigated during the oestrous cycle in four indigenous ewes. MATERIAL AND METHODS: Daily VER values were recorded with a heat detector. The follicles were observed and measured by trans-rectal ultrasonography. Blood was collected daily for hormonal profiles. RESULTS: A significant variation in VER values (P < 0.05) in oestrus by ewes and position in the sequence of cycles was observed. Trans-rectal ultrasonography of ovaries revealed the presence of 2-4 waves of follicular growth. Study of hormonal profiles by ELISA revealed a positive correlation between E2 concentration and development of follicles and a negative correlation between P4 concentration and their development. The concentrations of oestradiol increased in oestrus and then decreased to a basal level. Follicular growth was accompanied by a rise in the concentration of serum oestradiol. Inversely, when follicles received the stimulation for ovulation, concentration of progesterone started to fall, but after ovulation, it climbed back to its peak and remained at this state until next ovulatory follicle reached its maximum diameter. CONCLUSION: This study could help to set up a manipulative reproductive technique for improving genetic values in indigenous sheep.
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    Productive, reproductive, and estrus characteristics of different breeds of buffalo cows in Bangladesh
    Harun-Or-Rashid, M ; Sarkar, AK ; Hasan, MMI ; Hasan, M ; Juyena, NS (NETWORK VETERINARIANS BANGLADESH, 2019-12)
    OBJECTIVE: The objective of this research work is to know the productive and reproductive performances and problems of local, crossbred, Nilli, and Murrah buffalo cows in selected study areas in Bangladesh. METHODOLOGY: A total of 1,241 local, crossbred, Nilli, and Murrah buffalo cows were surveyed in the selected areas with a pre-set questionnaire. Among 1,241 buffalo cows, 112 buffalo cows were randomly selected at day 0 of the estrus cycle for studying ovarian features. RESULTS: Results showed that the average age, body condition score, and body weight were significantly (p < 0.05) different among the studied breeds. Milk production in Murrah and lactation length in Nilli cows were significantly (p < 0.05) higher than indigenous, crossbred, Nilli, and indigenous, crossbred, Murrah buffalo cows, respectively. Results also illustrated that sexual maturity, estrus cycle length, insemination time after the onset of estrus, and gestation length insignificantly (p > 0.05) varied among the surveyed breed. But, the fallout of the study denoted that estrus duration, first calving age, parity number, number of service per conception, calving interval, and voluntary waiting period varied significantly (p < 0.05) in different breeds. Ovarian physiological characteristics such as vaginal electrical resistance, average number of follicles in two ovaries, and largest follicular diameter, estrogen, and progesterone at day 0 of the estrus cycle of local, crossbred, Nilli, and Murrah buffalo cows showed insignificantly (p > 0.05) differences. CONCLUSION: The study will help the veterinarian and researcher to identify the constraints for the reproductive efficiency of buffalo in Bangladesh.