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Incldence of Oestrus Ovis. in Goats

Md. Hafezur Rahman
Department of Parasitology, Bangladesh Agricultural University, Mymensingh, Bangladesh.

M. J. Karim
Department of Parasitology, Bangladesh Agricultural University, Mymensingh, Bangladesh.

Abstract/ Executive Summary:

Incidence of Oestrus ovis L. was studied among 705 slaughtered goats in Mymensingh 24.82 per cent of goats were found infested and the frequency of infestation was more in colder months (January and February). All the three stages of larvae were detected and the maximum of larvae recorded from a single head was ten.

Keywords: Goat, Oestrus ovis, Mymensing distric

Location: Bangladesh Agricultural University Campus and Mymensingh town.

Start Date: 00-04-1977

End Date: 00-03-1978

Program Area: Pest Management

Commodity: Goat

Objectives:

To determine the incidence of Oestrus ovis L. among goats in the District of Mymensingh.

Methodology:

The survey was carried out on slaughtered goats from April, 1977 to March, 1978. The slaughter centres both at the Bangladesh Agricultural University Campus and Mymensingh town were visited on every alternate days to examine the heads 01 the slaughtered goats. A total of 705 heads were examined and the goats belonged to young age groups (between 1-3 years of age) and to both sexes. The heads were opened up and the nasal chambers, head sinuses and base of the horns were carefully examined to detect the larvae. The detected larvae were collected and counted. For identification and stage-wise classification of the larvae, standard descriptions of Capelle (1966) and Soulsby (1962) were followed.

Source of Information: Bangladesh Journal of Agriculture,Page:377-378,Vol-3, No-2, Dec:1978

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Oestrus ovis larvae were recovered from 175 heads of goats from a total of 705 heads which constituted 24.82 per cent of infestation. Most of the larvae were detected at the base of the horns, and some from the nasal and frontal sinuses. The load of larvae varied from one to ten in a single head. The larvae were small creamy-white, 1.5 mm long first stage-larvae to large, dark black, 30 mm long third-stage larvae. The month-wise pattern of incidence as is shown, indicates that a significant per cent of goats remain infected throughout the year. The incidence rises in colder months with higher incidences in January and February. This rise in colder months is probably due to a large number of larvae remaining quiescent from cold. The low incidence in the other months of the year is accounted for the large number of larvae leaving the goats for pupation. and the rate of infestation was determined 24.82 per cent. Although goats were infested all through the year, percentage of infestation was higher in colder months (January and February). The maximum number of larvae counted from a single head was ten. The stage-wise classification revealed all three stage of larvae detectable in a single head.

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