T R Rathinam

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Many avian species in temperate zones respond to long photoperiods by showing recrudescence of gonads. Compelling evidence show that non-retinal, non-pineal photoreceptors exist in the avian brain. Within the ventral forebrain are specialized neurons that respond to light found in the medial portion of a circumventricular organ called the lateral septal(More)
A method previously described by Jeffers and Bentley, involving calculation of a growth and survival ratio and optimal anticoccidial activity index, was used to investigate the sensitivity of 23 field isolates of Eimeria obtained from turkey flocks to the ionophorous antibiotic monensin. Isolates were obtained from litter and intestinal samples from several(More)
For the purpose of re-describing the Eimeria species that infect the turkey (Meleagris gallopavo) and to establish benchmark biological information linked to genetic markers for each species, a strain of Eimeria meleagrimitis Tyzzer 1929 was obtained from a litter sample from a turkey farm in Minnesota, USA in 2008. Multiple pure lines were derived by(More)
The sensitivity of field isolates of turkey coccidia from the United States to the anticoccidial drugs amprolium, clopidol, diclazuril, and monensin was investigated. Clopidol and diclazuril were the most effective, followed by monensin and amprolium. Thirty-one isolates were classified as resistant to amprolium, 23 resistant to monensin, 10 resistant to(More)
In order to determine the evolutionary relationships among Eimeria species that parasitize birds of the Galliformes, the 18s rDNA gene and a portion of the cytochrome oxidase subunit 1 (cox-1) were amplified from Eimeria species isolated from turkeys, chukars, and pheasants. The phylogenetic analysis of these sequences suggests that species infecting(More)
1. An experiment was designed to evaluate the effect of different doses of oocysts of Eimeria acervulina on intestinal absorption and skin deposition of xanthophylls (XAs) in broilers. 2. A total of 192 broiler chickens were randomly assigned to 4 groups: an uninfected control group and three groups inoculated with either 1 × 10(2), 1 × 10(4) or 1 × 10(5)(More)
A primary infection of 12.5 x 10(3) oocysts of Eimeria adenoeides , given to 20-d-old turkey poults, resulted in depression of weight gain, and the production of large numbers of oocysts in the feces, compared with uninfected controls. Poults were raised under conditions to prevent possible reinfection to determine the ability of the primary infection to(More)
Cellular immune responses, chemokine, and cytokine profiles were investigated in 20-d-old turkey poults following an oral infection with 12.5 × 10(3) oocysts of Eimeria adenoeides, a protozoan parasite of the genus Eimeria that develops in the ceca. Large numbers of oocysts were produced in the feces of infected birds from d 5 after infection followed by a(More)
Anticoccidial effects of Sericea Lespedeza (SL) included in the diet at different levels were evaluated in chickens following oral infection with sporulated oocysts of either Eimeria acervulina, Eimeria maxima or Eimeria tenella. A series of experiments were conducted to determine the effect of SL upon the ability of the parasites to multiply in the(More)
An attenuated line of Eimeria meleagrimitis was established by repeated propagation of the parasite in 9-day old turkey poults and subsequent selection for precocious development. Following 20 passages, the prepatent period decreased from 120 to 104h. A series of experiments were conducted to evaluate the pathogenicity, immunogenicity and fecundity of the(More)