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Kerala Veterinary and Animal Sciences University, Wayanad

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Subject: Animal Reproduction and Gynecology × Author: AJIT KUMAR, g × End date: 2023 ×
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    ThesisItemOpen Access
    MANAGEMENT OF OESTROUS CYCLE IN CROSSBRED CATTLE USING PROSTAGLANDIN
    (COLLEGE OF VETERINARY AND ANIMAL SCIENCE,MANNUTHY, 1994) AJIT KUMAR, g; MADHAVAN, E
    With the object of studying the efficacy of administration of prostaglandin F2 alpha in the management of oestrous cycle and fertility of fixed time insemination in induced oestrus, 96 heifers and cows which were cycling, selected from Kerala Agricultural University Livestock Farms, v/ere allotted to three different groups. Sixteen heifers and 16 cows in group I v/ere given 25 mg PGF2 alpha (Lutalyse) intramuscularly v;hen they had functional corpora lutea, v/hile in group II, 16 heifers and 16 cows were administered two injections of PGF2 alpha 25 mg each 13 days apart. Sixteen heifers and 16 cows were treated as control (Group III). Tv/elve heifers (75%) and 16 cows (100%) in group I and all animals in group II responded to treatment. Mean tim.e taken for induction of oestrus was 56.64 and 65.44 h respectively in heifers and cov;s. This difference was statistically significant. Parity of cows significantly influenced the time taken for induction of oestrus. Duration of oestrus was significantly different between heifers (21.86 h) and cows (31.13h)' of the experimental group. Significant difference in the duration of oestrus v/as observed among cows between experimental and control groups. All experimental animals v/hich responded to PGF2 alpha showed marginal increase in physical characters of the reproductive tract like vulval oedema, hyperaemia of vaginal mucosa, vulval discharge and tonicity of uterine horns. Majority of the experimental animals shov/ed medium to high intensity of oestrus compared to natural oestrus. The first insemination and overall conception rates of heifers in group I, inseminated 72 h post-treatment, were 33.33 and 66.67 per cent respectively as against 33.33 and 50 per cent when inseminated 96 h post-treatment. Cows in group I recorded 25 and 62.50 per cent and 37.50 and 62.50 per cent first insemination and overall conception rates respectively when inseminated 72 h and 96 h posttreatment. When heifers and cov/s in group II were inseminated 72 h after the administration of the second dose of PGF2 alpha, 12.50 and 25 per cent conceived at first insemination with overall conception rate of 62.50 and 37.50 per cent respectively. The corresponding values in group II, when inseminated 96 h, were 25 and 12.5 per cent and 50 and 12.5 per cent respectively. Among control 6.25 per cent of heifers and 18.75 per cent of cows conceived at first insemination. The first insemination conception rate of heifers of experimental (25%) and control groups' (6.25%) were significantly different. However, overall conception rate did not differ between the three groups. There v;as no influence of parity or season on the conception rate. Similarly the time taken for induction of oestrus, duration of oestrus, physical changes of the reproductive tract during oestrus and intensity of oestrus did not affect the conception rate. Heifers and cows required 1.88 and 1.93 inseminations respectively per conception when treated with PGF2 alpha as against 3.14 and 3.33 in the control group. Though, the present investigation revealed that PGF2 alpha can be used in the management of oestrous cycle in crossbred heifers and cows with fixed time insemination, the high cost of the drug and the conception rate obtained warrant further studies on fertility in relation to detected .oestrus and fixed time insemination after the administration of PGF2 alpha.