Dermatophilosis in sheep raised under rotational grazing systems on irrigated pastures in the Brazilian semiarid region

Abstract

Dermatophilosis in sheep raised under rotational grazing systems on irrigated pastures in the Brazilian semiarid region.Ciência Rural, v.47, n.8, 2017. INTRODUCTIONDermatophilosis is a disease that primarily affects cattle, goats, sheep and horses (PEREIRA & MEIRELES, 2007;RADOSTITS et al., 2010). It is caused by Dermatophilus congolensis, which is a filamentous and branched Gram-positive coco-bacillus within the actinomycetes group that causes exudative dermatitis with crusts that stand out easily (WABACHA et al., 2007). Bacterium is considered to be aerobic or facultative anaerobic (NORRIS et al., 2008 Most outbreaks occurred after rains and affected sheep of different ages, with morbidity rates of 0.77% to 31%. Clinical signs were dermatitis with crusts that stood out easily and left areas of alopecia. Dermatophilus congolensis was isolated in cultures in 5% sheep blood agar by means of Haalstra's method. Histologically, the epidermis showed extensive multifocal areas of ortho and parakeratotic hyperkeratosis with intracorneal microabscesses and presence of D. congolensis. Sheep affected were isolated from the flocks and they recovered after treatment with 70,000IU of procaine penicillin G and 70mg of dihydrostreptomycin sulphate per kg of bodyweight. Dermatophilosis is a frequent endemic disease in rotational grazing systems with irrigated pastures and high stocking rates, which occurs with higher frequency after rains and can

Controle de parasitas gastrintestinais em ovinos e análise financeira de uma fazenda com sistema de pastejo rotacionado irrigado no semiárido nordestino

“…Outro problema sanitário a ser controlado é a dermatofilose, doença muito frequente no sistema rotacionado em pastagens irrigadas (Vieira et al 2017). Uma das vantagens deste sistema em clima semiárido é que os ovinos apresentam estro e ovulação durante todo o ano, e com boa alimentação podem parir mais de uma vez ao ano e podem alcançar três partos em dois anos (Voltolini 2011).…”

Clinical, Haematological and Biochemical Findings in Sheep Naturally Infected with Dermatophilus congolensis

“…The reported clinical symptoms associated with ovine dermatophilosis include matted tufting, entanglement, hardening and loss of wool and the thickening and itching of the skin [9,21]. In the present study, the infected animals manifested with typical exudative lesions in several portions of the body, primarily in the head region and along the back, as well as pruritus, scabbing, crusting, thickening, hardening and cracking of the skin, along with matted tufting and the loss of wool.…”

“…Previous researches have proven the effectiveness of parenteral penicillin/streptomycin [9,21,32] and oxytetracycline [1,15,22,32,33] administration in the treatment of D. congolensis infection. Local treatment with antibiotic [1,9] and antiseptic [15,32] solutions have also been reported to be applied together with parenteral antibiotics, suggesting that, although local treatment has a limited effect, it provides an extra benefit in the control of the disease [4].…”