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Author: Das, Nilotpal × End date: 2017 × Start date: 2017 × Thesis Type: M.V.Sc. ×
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    ThesisItemOpen Access
    STUDY ON PROLONGED OESTRUS IN CROSSBRED CATTLE
    (College of Veterinary Science Assam Agricultural University Khanapara, Guwahati-781022, 2017-07) Das, Nilotpal; Bhuyan, Manjyoti
    The study was conducted in crossbred cows maintained in Instructional Livestock Farm (Cattle), College of Veterinary Science, Khanapara, Guwahati and in the private dairy farms located around Guwahati to record the incidence of prolonged oestrus, signs of oestrus, hormonal profiles and blood biochemical constituents, and to evolve a suitable treatment of prolonged oestrus. The incidence of prolonged oestrus in crossbred cows was 14.24 per cent comprising 7.60, 5.04 and 1.60 per cent of 2, 3 and 4 days durations respectively. The different behavioural signs of oestrus exhibited by prolonged oestrous crossbred cows were mounting, bellowing, decreased appetite, restlessness and sniffing of genitalia with a percentage frequency of 60.00, 66.66, 26.66, 100.00 and 20.00 respectively on 1st day of oestrus. The percentage frequency of different behavioural signs of oestrus decreased during subsequent days. The percentage of cows exhibiting mounting, decreased appetite and restlessness signs was 3.33, 5.00 and 10.00 respectively on 4th and 0.00, 1.66 and 3.33 respectively on 5th day. Out of different physical signs of oestrus, the most conspicuous signs were swelling of vulva, pink colour of vaginal mucous membrane, free flowing vaginal mucus, thin consistency of vaginal mucus and clear vaginal mucus. These signs were observed in 68.33 to 100.00 per cent of animals on 1st day of oestrus. Except clear colour of vaginal mucus, the percentage of animal showing other physical signs decrease on subsequent days and no animal showed free flowing and thin consistency of vaginal mucus on 4th day of oestrus. The frequency of occurrence of clinico-gynaecological changes in the genital organs viz., relaxed cervix, opened cervix, good uterine tone, palpable large follicle on right ovary, palpable large follicle on left ovary and tense follicular wall was 100.00, 100.00, 66.66 66.66, 33.33 and 100.00 per cent on 1st day of oestrus. The frequency of occurrence of these signs gradually decreased in subsequent days of oestrus upto 4th day. Statistical analysis showed that level of serum estradiol, progesterone, cortisol, calcium, phosphorus, zinc and cholesterol did not differ significantly between crossbred cows of 2, 3 and 4 days prolonged oestrus groups and between days within group. The mean levels of serum calcium and phosphorus in prolonged oestrous crossbred cows with 2, 3 and 4 days durations increased significantly (P<0.01) after treatment with mineral mixture supplementation and anti stress therapy. However, level of serum zinc increased significantly (P<0.01) in prolonged oestrous cow of 2 days duration and serum cholesterol in 3 and 4 days durations. The conception rate in prolonged oestrous crossbred cows was found to be 45.00, 55.00 and 40.00 per cent for mineral mixture supplementation and anti stress therapy, Buserelin acetate injection and for control group without treatment respectively.