The Pre-Natal Development of Skin and hair in Cattle (Bos Taurus L.)

Lyne, A. G.; Heideman, Margaret J

doi:10.1071/bi9590072

Cited by 34 publications

(25 citation statements)

References 24 publications

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“…However, the seemingly conflicting data beco'mes more understandable when the effects of breed, sex, and age are considered with the data reported. Lyne & Heideman (1959) reported that the density of all hair follicles in cattle are established at birth, and Turner et al (1962) reported that the total number of follicles on Bos taurus beef cattle was constant. Cattle age has been shown to have a significant influence on hair density up to 3 years (Carter & Dowling, 1954), and Turner et al (1962) concluded that the density of hairs was higher in male than in female calves.…”

Section: Discussionmentioning

confidence: 99%

The effects of hair density of beef cattle on Haematobia irritans horn fly populations

Steelman

Brown²,

Gbur

et al. 1997

Medical Vet Entomology

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We show the relationships that exist between the amount of hair and quantity of sebum on cattle skin and the population density of the horn fly, Haematobia irritans. Brahman and Chianina steers had means of 2390 and 1587 hairs per cm2, respectively, significantly more than the mean number of hairs on Angus, Brahman x Angus Crossbred, Charolais, and Red Poll steers. The Chianina steers had > 30% more sebum present on their skin and hair (0.58g/929 cm2) than the Angus, Charolais, and Red Poll steers at the Beef Cattle Research Station Savoy, Arkansas. The Brahman steers had a significantly greater amount of sebum present on the skin (1.51 g/929 cm2) than the Crossbred and purebred Angus steers (0.55 and 0.25 g/929 cm2, respectively) at the South Central Family Farms Research Centre Booneville, Arkansas. The Brahman and Chianina steers had means of 61.9 and 17.0 horn flies per steer, respectively, during the fly season, whereas the Angus, Crossbred, Charolais and Red Poll steers had fly season means that ranged from 76.9 to 265.8 flies per steer. Regression analysis showed that an increase of 100 hairs per cm2, was associated with a reduction of 11 horn flies in the Angus II, 5 in Angus I, 20 in Charolais, 37 in Red Poll, and 0.4 in Chianina steers at the Savoy Station and a reduction of 6.6 horn flies for the Angus, Brahman, and Crossbred steers at the Booneville Centre. Regardless of cattle breed, an increase of 1.0 g of sebum per 929 cm2 output by the steer was associated with 478.5 additional hairs per cm2 on the animal. Each increase of 0.25 g of sebum per 929 cm2 resulted in a decrease of 9.2 horn flies per steer. We conclude that some of the factors responsible for fly-resistance in cattle are hair density and the corresponding amount of sebum present on cattle skin and hair.

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Section: Discussionmentioning

confidence: 99%

The effects of hair density of beef cattle on Haematobia irritans horn fly populations

Steelman

Brown²,

Gbur

et al. 1997

Medical Vet Entomology

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“…When a loose mass of feltable animal fibers is agitated in water with some pressure on them, the individual fibers more preferentially in one direction (the directional fiber effect) becoming entangled and consolidating the structure of the assembly. The product is a natural or pressed felt (MAKINSON, 1979).…”

Section: Discussionmentioning

confidence: 99%

Pathological Studies of Cross‐Related Congenital Hypotrichosis in Cattle

Ayers

Leipold

Schalles

et al. 1989

Journal of Veterinary Medicine Series A

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Summary Examination of 13 cattle with cross‐related congenital hypotrichosis showed that the disease is characterized by a short, curly, dilute‐color, malformed, sometimes sparse, hair coat that occasionally causes physical impairment of the affected animal. Because the disease is associated with crossbreeding programs utilizing certain breeds of cattle, it is hypothesized that the etiology may be due to color dilution mutants present in European breeds of cattle. Continued investigation may lead to a more complete understanding of this disease. Zusammenfassung Pathologische Untersuchungen zur kreuzungsbedingten kongenitalen Hypotrychose beim Rind Nach Untersuchungen an 13 Rindern mit kreuzungsbedingter kongenitaler Hypotrychose ist für die betreffende Krankheit ein kurzes, lockiges, helles, mißgebildetes und manchmal dünnes Haarkleid charakteristisch, das gelegentlich eine körperliche Beeinträchtigung der betroffenen Tiere zur Folge hat. Da sich die Krankheit im Rahmen von Kreuzungsprogrammen mit bestimmten Rinderrassen manifestiert, wird eine auf Farbverdünnungsmutanten in europäischen Rinderrassen basierende ätiologie vermutet. Weitere Untersuchungen sind für ein besseres Verständnis der Krankheit erforderlich.

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“…The full complement of hair follicles is presented at c . 200 days of gestation and all follicles are mature at birth . Because there were approximately 50% of hair follicles missing without any signs of their presence in the past, we think that hypotrichosis in this case is of congenital origin.…”

Section: Discussionmentioning

confidence: 99%

Congenital hypotrichosis in a Simmental cross heifer

Starič

Gombač

Ježek

et al. 2019

Veterinary Dermatology

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Background -Congenital hypotrichosis is defined as a less than normal amount of hair, obvious at birth or in the first weeks of life. Causes are nongenetic or genetic.Objectives -To describe the clinical presentation and histological features of a novel form of hypotrichosis in a heifer.Animal -A 15-month-old Simmental cross-bred heifer was presented with a history of progressive hair loss, which started at four months of age and progressed to severe generalized hypotrichosis.Methods and materials -Anamnestic data, detailed clinical examination, haematological investigation, selected biochemistry profile, RT-PCR and ELISA for bovine viral diarrhoea virus did not suggest a cause for the hypotrichosis; skin samples were examined histologically.Results -Histopathology of the skin showed a 50% reduction in the number of hair follicles and dysplastic hair follicles; these findings led to a diagnosis of congenital hypotrichosis. The distribution of the hair and some of the histopathological characteristics were potentially consistent with viable hypotrichosis. A marked reduction in follicle density, hypertrophy of sebaceous glands, hypoplasia of arrector pili muscles and moderate acanthosis with hyperkeratosis, which have not been described previously in viable hypotrichosis or other forms of congenital hypotrichosis, were also observed.Conclusion and clinical significance -This case may represent a novel form of congenital hypotrichosis.

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The Pre-Natal Development of Skin and hair in Cattle (Bos Taurus L.)

Cited by 34 publications

References 24 publications

The effects of hair density of beef cattle on Haematobia irritans horn fly populations

The effects of hair density of beef cattle on Haematobia irritans horn fly populations

Pathological Studies of Cross‐Related Congenital Hypotrichosis in Cattle

Congenital hypotrichosis in a Simmental cross heifer

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