A genetically recessive albino mutation, which inhibits pigment development in the eyes, skin, and feathers of domestic chickens from Brazil, is described. This mutation appeared in a flock of completely black chickens of a private breeder. There are no information on the origin, breed, or specific line of the birds. Pigment inhibition is apparently complete in the feathers and eyes. Bird sight is very impaired, but no histological examination was carried out. Ratios obtained in F2 and backcrossed birds indicate that a single autosomal recessive gene is responsible for the condition. The data suggest that the absence of melanin in the eyes, skin, and feathers (symbol cc) is a mutation of the pigmented C wild gene
haja manifestação de sinais clínicos (TAYLOR et al., 2017), portanto, não podem ser negligenciadas durante a elaboração de estratégias de controle das helmintoses.Este estudo fornece informações úteis sobre o parasitismo gastrintestinal em éguas adultas mantidas sob manejo extensivo. Nos animais avaliados, as infecções por ciatostomíneos foram maiores nas fêmeas em lactação, vazias e prenhes, quando comparadas às fêmeas vazias. Em relação ao P. equorum, a infecção foi maior nas éguas vazias e lactando quando comparadas às éguas prenhes. Essas fêmeas podem servir de fonte de contaminação ambiental e devem receber atenção especial na elaboração dos programas de controle parasitário.ABSTRACT he aim of the present work, was to relate the prevalence of intestinal nematodes regarding the age and the reproductive status of breeding mares, in the south region of Pelotas, Rio Grande do Sul. 125 stool samples, were obtained from mares (breed Crioulo), between 2 and 27 years of age. The samples, were analyzed through the Gordon and Whitlock technique and coproculture test. In the evaluated mares, the Cyathostominae frequency was of 89.6% and the frequency of Parascaris equorum was of 14.4%. Chi-square tests (p<0.05), were done, in order to compare the distribution of the intestinal nematodes, with regard to the age of the females (2-5, 6-10, 11-15, above 16 years old) and the reproductive status of the mares (non-pregnant, non-pregnant and lactating, pregnant, pregnant and lactating). There were not statistical differences, regarding the age of the females (p>0.05). Regarding the reproductive condition, non-pregnant and lactating mares, were significantly more likely to have Cyathostominae (p=0.013) and P. equorum (p=0.022) infections, compared with the non-pregnant and pregnant mares. The pregnant and lactating females were significantly more likely to host Cyathostominae, compared to the non-pregnant (p=0.001). In the evaluated animals, the infection by nematodes was higher in lactating females, indicating that these, can be a source of environmental contamination and they should receive special attention in the development of parasitic control programs.
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