The Relative Susceptibility of Chickens of Different Ages to Coccidiosis Caused by Eimeria Necatrix

Brackett, Sterling; Bliznick, Alexander

doi:10.3382/ps.0310146

Cited by 8 publications

(3 citation statements)

References 2 publications

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“…The intestinal contents, which were rich in merozoites, were suspended in warm normal saline and injected per rectum into two coccidia-free poults, each receiving four injections over a period of 1 hr. This technique has been described by Tyzzer (1929), Levine (1940), Brackett & Bliznick (1952) and recently by Davies (1956). The birds were killed 24 and 28 hr.…”

Section: Resultsmentioning

confidence: 99%

Life history and pathogenicity of Eimeria adenoeides Moore & Brown, 1951, in the turkey poult

Clarkson¹

1958

Parasitology

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The life cycle and pathogenicity of a strain of Eimeria isolated in Great Britain from turkey poults by single cell inoculation are described and, using the criteria laid down by Tyzzer, the species is identified as E. adenoeides.The life cycle is of the same general pattern as in other Eimeria species, consisting of two asexual and one sexual generations.The organism is highly pathogenic for young poults, a dose of 200,000 oocysts producing 100 % mortality in 3-week-old birds and smaller doses causing reduced weight gain. Birds 11 weeks old resisted a dose of 3 million oocysts.The gross and microscopic pathology of the infection is described. No changes were found in the blood picture.

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Section: Resultsmentioning

confidence: 99%

Life history and pathogenicity of Eimeria adenoeides Moore & Brown, 1951, in the turkey poult

Clarkson¹

1958

Parasitology

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“…The remainder of the life cycle has been studied by Johnson (1930) and Tyzzer, Theiler and Jones (1932) Brackett and Bliznick (1952a) reported that the number of oocysts produced by E. necatrix per oocyst fed ranged from 1 5 in a group of chicks infected with 35,000 oocysts each to 58,000 in another group in which the infective dose was 50 oocysts.…”

Section: Diagnosismentioning

confidence: 99%

Protozoan parasites of domestic animals and of man

Levine¹

1961

516

493

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A disease which is common to man and lower animals is known as a zoo)iosis. Zoonoses were redefined in 1958 by the Joint WHO FAO Expert Committee on Zoonoses as "those diseases and infections which are naturally transmitted between vertebrate animals and man" (World Health Organization, 1959). Less than 20 years ago it was said that there were 50 zoonoses, but in the above report the World Health Organization listed more in connection with vector-borne diseases, altho it need not be restricted to them. epidemiology, taxonomy, evolution, etc.(see ). A dei)ie is a natural population within a species. It lies more or less below the subspecies level, but it is not a formal taxon and is not given a Latin name. There are different types of deme. Nosodemes differ in their clinical manifestations. One example is Leishmania donovani, which has five nosodemes, Indian, Mediterranean, Sudanese, Chinese and South American, which produce different types of disease. Serodemes differ serologically. These are best known among the bacteria and viruses, but also occur among the animal parasites. Tritrichonionas foetus, for example, has several serological types or serodemes. were markedly resistant to infection with Ostertagia circunicincta. while Rambouillets were less so and Southdowns, Shropshires and Hampshires were least resistant.Certain individuals among the more susceptible breeds, however, were just as resistant as the Romneys. Whitlock(1958) has studied genetic resistance to trichostrongylidosis in sheep in some detail.The nutritional status of the host may affect its resistance. Poorly nourished animals are usually more susceptible to infection and suffer more severely from its effects.Protein depletion or protein starvation is particularly important. Lack of specific vitamins and minerals generally decreases resistance, but there are cases in which lack of a certain vitamin which the parasite requires may affect the parasite adversely. Thus, Becker and Smith (1942) found that when calcium pantothenate was added to a ration containing restricted vitamins B,, Bg and pantothenate, the number of oocysts produced hy Einteria nieschulzi infections in the rat was increased.

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“…Dickinson (1941), working with Eimeria acervulina reported that the severity of infection produced in susceptible birds of various ages was "in proporton to the number of sporulated oocysts administered in a single dosage." Brackett and Bliznick (1952), who used Eimeria necatrix as their pathogen, concluded that young birds are more severely affected than older birds when equal numbers of oocysts are ingested, and that relatively small numbers of oocysts (25,000 to 50,000) will cause a high degree of mortality in young chicks. Tyzzer, Theiler and Jones (1932) made a tentative exploration of this problem, using both E. necatrix and E. tenella, but so few birds were involved that their results are of little value.…”

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confidence: 98%

The Severity of Cecal Coccidiosis Infection in Chickens as Related to the Age of the Host and the Number of Oocysts Ingested

Gardiner

1955

Poultry Science

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The Relative Susceptibility of Chickens of Different Ages to Coccidiosis Caused by Eimeria Necatrix

Cited by 8 publications

References 2 publications

Life history and pathogenicity of Eimeria adenoeides Moore & Brown, 1951, in the turkey poult

Life history and pathogenicity of Eimeria adenoeides Moore & Brown, 1951, in the turkey poult

Protozoan parasites of domestic animals and of man

The Severity of Cecal Coccidiosis Infection in Chickens as Related to the Age of the Host and the Number of Oocysts Ingested

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