RESUMEN
The mite Allopsoroptoides galli has recently been identified parasitizing commercial chickens, São Paulo State/Brasil, causing severe dermatitis on all parts of the animal's body and a significant decline in productivity, particularly in egg production. The aim of the present study in A. galli infestation was to investigate the impact on laying hens' performance and egg quality. A total of 100 56-week-old Hy-line white laying hens were used. The birds were divided into 2 groups, with 10 replicates of 5 birds in each group. The experimental groups consisted of a non-infested group (hens free of theA. galli) and an infested group (hens presenting A. galli). The infestation with A. galli did not significantly influence feed intake but caused a significant reduction in the body weight of the hens and caused a decrease in egg production, therefore promoting worse feed conversion. The egg weight was reduced; however, the infestation did not significantly affect the internal quality of the eggs, which was measured according to the yolk color, albumen height, and Haugh units, or the quality of the shell, based on its percentage, thickness, and strength. It can be concluded that anA. galli infestation promotes a reduction in body weight, egg production, and egg weight in laying hens, therefore worsening feed conversion.
Asunto(s)
Ácaros y Garrapatas/fisiología , Pollos , Infestaciones por Ácaros/veterinaria , Enfermedades de las Aves de Corral/parasitología , Animales , Peso Corporal , Brasil , Femenino , Infestaciones por Ácaros/parasitología , Óvulo/fisiología , ReproducciónRESUMEN
ABSTRACT The objective of the present study was to evaluate the influence of fasting on the fecundity of D. gallinae. Females were maintained in tubes in order to feed on a young bird and then were kept fasting for 1 to 12 days. The results demonstrated that females laid eggs up to the 11th day. The number of eggs laid ranged from 1 to 8, and the greatest means were obtained in females kept up to 8 days fasting. The greatest percentage of eggs laid occurred up to the 3rd day of fasting, with a decrease from the 4th to the 12th day.
RESUMO O trabalho teve por objetivo estudar a influência do jejum na fecundidade de Dermanyssus gallinae. Fêmeas foram colocadas em tubos para se alimentar sobre uma ave jovem e, em seguida mantidas sob jejum por períodos de 1 a 12 dias. Os resultados obtidos demonstraram que as fêmeas ovipuseram até o 11º dia. O número de ovos depositados variou de 1 a 8, sendo as maiores médias obtidas nas fêmeas mantidas até o 8° dia de jejum. A maior porcentagem de oviposição ocorreu até o terceiro dia de jejum, havendo uma redução do 4° ao 12° dia.
RESUMEN
The development, viability, and life cycle parameters of Dermanyssus gallinae at five different temperatures (15, 20, 25, 30 and 35 degrees C), and at relative humidity 70-85% were evaluated. Life cycle duration was 690.75 h (28 days) at 15 degrees C, 263.12h (11 days) at 20 degrees C, 164.63 h (7 days) at 25 degrees C, 140.69 h (6 days) at 30 degrees C and 172.04 h (7 days) at 35 degrees C. The optimal development temperature for D. gallinae was 30 degrees C, with the greatest survival in all stages and the shortest development time. High mortality at 35 degrees C indicated that this temperature had adverse effects on development of D. gallinae, and that in field conditions D. gallinae populations may decrease or even disappear due to the negative impact of high temperature on development. There were no significant differences in the pre-oviposition period among the four temperatures 20-35 degrees C, indicating that temperature did not affect this part of the life cycle.