Studies onAscaridia galliin chickens kept at different stocking rates

Abstract

The development of Ascaridia galli infections was investigated over a period of 378 days in parasite naïve chicken flocks ('permanent flocks') kept at different stocking rates and infected by introducing previously infected chickens (seeder birds). The results of this study indicated that differences in stocking rate may lead to different levels of establishment of A. galli infections in chickens. Furthermore, significantly higher weight gains were seen in the medium stocking rate (MSR) group than in either the low stocking rate (LSR) or the high stocking rate (HSR) groups. Periodically, the egg excretion was significantly different between the groups. Although not significant for the whole period, the general trend was that the egg excretion was lower in the MSR group than the LSR and HSR groups. The mean worm burdens in the permanent flocks at the end of the experiment were not significantly different from each other. To estimate the availability of infective eggs in the houses and pens, tracer animals were introduced into each of the permanent flocks every month. Information derived from tracer animals did not confirm an effect of stocking rate on the availability of infective eggs in the environment, although there was a trend towards higher mean worm burdens in the tracers from the MSR group.

Effects of paddock management on vegetation, nutrient accumulation, and internal parasites in laying hens

“…This reduction is more pronounced compared with results from organic farms in Sweden [25] and is most likely due to a loss of adult worms, which could be more pronounced in hens exposed to continuous infection than it has been observed after single experimental challenge [26]. Worm numbers and fecal egg counts of flocks X2, Y1, and the treated flock, Y2, are within the range observed in layers [6] and higher than those reported from a Danish study [27] at similar stocking rates. The finding that worm burdens vary widely between animals in the same flock confirms that, based on individual differences within the same hybrid, selection for A. galli resistance in layers is a realistic approach [28].…”

Comparative Anthelmintic Efficacy of Caesalpinia Crista, Nigella Sativa and Oxfendazole in Broilers with Experimentally Induced Ascaridia Galli Infection

“…2).These body weights completely correlates with the results of Shaker et al 2011 where he reported that alendazole and caesalpinia crista treated groups had no significant body weights difference at 28 th and 42 days of age in turkey poults infected with heterakis gallinarium, body weights at 28 th and 42 days of age were 947 33. ± 8.09 ,951.27 ± 8.45 and 2235.33 ± 7.41 ,2292.34 ± 7.79 respectively.body weight was significantly different in infected non medicated group and body weights were 757.47 ± 2.82 and 1392.00 ± 15.19 at 28th and 42 days of age.…”

“…The suspension was again poured through a wire mash screen. The eggs were resuspended in a 2% formalin solution to prevent contamination as described by Permin et al [33].…”

Infection dynamics of Ascaridia galli in non-caged laying hens

“…It has been proposed that worm infection may increase during the winter months if the litter becomes wet (Methling et al, 1994). Other suggested factors that may potentially influence worm burdens include stocking rate (Permin et al, 1998a), and/or the diet (Permin et al, 1998b), but we did not observe any clear patters in this respect. Although our results underline the complex infection dynamics of ascarid infections in laying hen flocks, it was confirmed that the magnitude of A. galli infection was not solely linked to whether the chickens had outdoor access or not.…”