By Ben Dawes (ed.)
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Extra resources for Advances in Parasitology, Vol. 3
1955) gives very comprehensive information on the behaviour of Bos indicus Nkedi Zebu cattle in the lacustrine area of Uganda. These workers established the proportion of the day spent in various activities, grazing, rumination and so on under free-grazing and paddocked conditions. They emphasize the difference in behaviour shown by these animals as compared with other similar studies on cattle and they discuss the individual and herd aspects of behaviour. ) sums up the work on the diurnal rhythms of cattle by saying that domestic animals are always under the control of their owners and so the results of experiments or observation of animals allowed to graze freely may not be representative of their behaviour under the control of African pastoralists.
The requirements of studies for further resolution of this question have been discussed above (p. 6). Wijers concludes that the peak proportion of long forms occurs during the time of rise in parasitaemic level, of short forms during a decrease in parasitaemia and that the intermediate form is a transition stage through which individual trypanosomes pass in changing from one of the extreme forms to the other. He considers it most possible that the periodicity of the parasitaemia is decided by antibody production influencing the production of short, stumpy from long, slender forms, each new relapse being caused by variants antigenically different from those of the preceding infection.
The reverse movement takes place at dawn. Most G. swynnertoni observed were resting on the upper surfaces of the leaves between 14 and 10 ft from the ground: Flies resting on the leaves can be removed by the hand with ease (Southon, 1958). McDonald (1960) found G. morsitans rested at night on twigs, leaves and small creepers, mostly more than 7 ft from the ground; G. palpalis also settled on leaves or small twigs but within 1 ft of the ground. d. Glossina populations. The interrelations between Glossina and its environment are of great complexity.