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19792
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Subject: Animal Reproduction and Gynecology × End date: 1979 × Start date: 1979 ×
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    ThesisItemOpen Access
    Studies on post- partun oestrum in cross bred cows
    (Department of Animal Reproduction, College of Veterinary and Animal Sciences, Mannuthy, 1979) Suresan Nair, S P; KAU; Neelakanta Iyer, C P
    The object of the study was to find out the various reproductive parameters that influence the onset of post – partum oestrus in cross bred cows. With this object in view, a detailed investigation was undertaken in a herd of 115 cross bred cows of Jersey x Sindhi and Jersey x Local breeds belonging to the University Livestock Farm of the Kerala Agricultural University, Mannuthy during the period from February 1978 to March, 1979. After parturition, they were grouped into normal and abnormal calvers based on the normalcy of calving. All the cows were stall fed and were under identical conditions of feeding and management. The observations made and inferences drawn are summarised below: There were significant variations in the cessation of lochial discharge, regression of pregnancy corpus luteum, period of uterine and vulval involution, onset of first and second ovulations and the post – partum oestrus interval between normal and abnormal parturitions. Duration of lochial discharge, regression of pregnancy corpus luteum and onset of first ovulation were found to be significantly influenced by the season of calving. Parity of the cow was found to influence the period of lochia, involutions of uterus and also the post – partum oestrus interval. Milk yield of the cow significantly influenced regression of pregnancy corpus luteum and vulval involution. However, the breed of the cow and sex and weight of calf were not found to have any significant effect on the reproductive parameters studied. An incidence of 13.4 per cent of aberrations of oestrum was also observed.
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    ThesisItemOpen Access
    Studies on the preservation of buck seman
    (Department of Animal Reproduction, College of Veterinary and Animal Sciences, Mannuthy, 1979) Balakrishnan, P P; KAU; Neelakanta Iyer, C P
    With the ultimate object of evolving a suitable extender for buck semen, 64 ejaculates from eight healthy cross bred bucks (6 saanen x Malabari and 2 Alpine x Malabari) selected at random from “ All India Co-ordinated Research Project on Goats for Milk Production”, Mannuthy, were used for the preservation studies. Six diluents viz., Tris, Skim milk citrate fructose glycine (SMCFG), milk citrate fructose glycine (MCFG), whole cows milk (CM), whole goats milk (GM) and Cornell University Extender (CUE) were stored at 50C and at room temperature in coconut milk extender (CME). Buck semen could be stored up to 60 hours in Tris, SMCFG and MCFG with good motility at 50C. In CME, semen could be stored only up to 24 hours in 1: 200 dilution. Egg yolk containing diluents proved to be least suitable for preservation of buck semen at 50 C. The percentage of conception rate was 44.0, 52.0 and 53.3 with Tris, SMCFG and MCFG diluents respectively.