K M Alexander
Articles written in Proceedings – Animal Sciences
Volume 88 Issue 3 June 1979 pp 171-178
A detailed study on aspects of feeding behaviour of the Indian musk shrew,
Volume 88 Issue 3 June 1979 pp 179-185
Studies on food deficit drives of the Indian musk shrew,
Volume 89 Issue 5 September 1980 pp 467-483
Effect of castration and oral administration of sex hormones on the specialised apocrine sudoriferous glands of the perineal region and the holocrine sebaceous glands of the flank and oral lip regions of the male musk shrew,
Volume 91 Issue 4 July 1982 pp 349-355
The biochemical assay of certain metabolites of the red and white myotomal muscles of the tuna,
Volume 92 Issue 1 January 1983 pp 37-41
A comparative study on the myocardial SDH levels in certain representative vertebrates revealed interesting variations. The
Volume 93 Issue 6 October 1984 pp 535-542
Specialized integumentary glands have been observed at certain specific body regions of the common house rat,
Volume 93 Issue 7 December 1984 pp 655-662
The fine structure of the sebaceous gland acini which form the bulk of the flank gland in the Indian musk shrew was studied. The secretion of the gland appeared to be mainly lipoid in nature, seen as numerous intracellular lipid droplets showing varying degrees of osmophilia from light to intense dark. The mitochondria contained one to several electron dense inclusions which were discharged from disrupted mitochondria and were seen floating in the cytoplasm and also in the ducts of the gland complex. It is suggested that these inclusions which presumably contain high concentrations of waxes synthesized within the mitochondria, form the major components of the holocrine secretion discharged from the flank gland of the shrew.
Volume 94 Issue 3 June 1985 pp 173-186
Ethology, a fast developing field of animal sciences has considerable relevance in animal husbandry, agriculture, control of animal populations, pest control, medicine, wildlife biology, etc. It has made vast strides of progress during the past few decades and some of these trends are reviewed.
Communication signals play a salient role in sociobiology of animal groups. Animals deploy visual, acoustic, tactile and olfactory signals during their social interactions. Among these, olfactory cues have certain specific advantages over the other modes concerned. Recently considerable attention has been focussed on chemical signals in animals, especially those of economically important forms such as insects, fishes and mammals.
Regarding insects, sex pheromones, aphrodisiacs, trail markers, aggregating and alerting pheromones have been isolated in various insectan orders. The factors controlling sex pheromone behaviour and impact of pheromones on control of insect population have been elaborated.
Investigations on chemical cues of lower vertebrates indicate that fishes, amphibians and reptiles deploy them in their social interactions. Pheromones modulate the schooling, reproductive and alarm response behaviour in fishes.
Among mammals, urine, fecal pellets, saliva and secretions of specialised skin glands function as sources of olfactory cues. Data on histophysiology, and ultrastructure of specialised skin glands, biochemistry of their secretions have been collected. Osmetrichia, scent marking patterns and fiehmen responses and their hormonal control have been elucidated. The neuroendocrinological basis of scent marking has been made explicit.
Relatively only very few of the mammalian pheromones have been isolated. The role of Primer pheromones in modulation of reproductive processes in some of the rodents and signalling pheromones in social interactions of some mammals have been elaborated.
Data on olfactory cues in human social interactions indicate the presence of social pheromones.
Visual signals of some insects and their role in reproductive activities have been investigated. Social postures in some rodent pests and their behavioural relevance have been studied. Acoustic signals in insects facilitate congregation, sexual attraction, aggregation and alarm responses. Further various aspects of vocalisations in birds and mammals have been investigated. Reproductive investment patterns and sex ratios in insects and parental investment in birds have been elucidated. Play behaviour and their role in behavioural development has been investigated. Etiological analysis of drug action in aggressive behaviour in certain mammals has been made.
Volume 97 Issue 6 November 1988 pp 499-503
Histomorphological investigations on the specialised integumentary glands of Indian field mouse,