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The physiology of digestion in larvae of Gastrophilus equi

Published online by Cambridge University Press:  06 April 2009

D. N. Roy
D. N. Roy
Affiliation:
From the Molteno Institute of Biology and Parasitology, University of Cambridge
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Extract

The results of the study on the digestion of Gastrophilus larvae may be summarized as follows:

(1) Pepsin-like enzymes are totally absent.

(2) The salivary glands secrete a proteolytic enzyme, which has no effect on the digestion of casein, gelatine and fibrin, but acts on milk alone.

(3) The midgut is capable of secreting amylolytic, proteolytic and lipolytic enzymes.

(4) The body fluid contains a strong reducing substance.

(5) The body fluid, as was shown by Khemnitz (1914), contains an amylolytic enzyme which is also capable of converting glycogen into glucose.

(6) Free glycogen and glucose circulate in the body fluid of the larva during the prepupal and possibly the pupal stage also.

(7) The larva of Gastrophilus does not feed on blood, but lives on the fluid material partly digested by its host in the stomach.

(8) For this reason the horses do not show any symptoms even when there is a heavy infestation.

Type
Research Article
Information
Parasitology , Volume 29 , Issue 2 , April 1937 , pp. 150 - 162
Copyright
Copyright © Cambridge University Press 1937

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