First report of Dermoglyphus passerinus (Analgoidea: Dermoglyphidae) and Strelkoviacarus sp.(Analgidae: Anomalginae) in canaries (Serinus canaria domestica) in Mexico.

Feather mites are the most numerous group of symbionts permanently associated to birds. They are highly specialized to particular microhabitats on their hosts and most of them may be considered as commensals, but several species are parasites. This manuscript documents for the first time a combined infestation by quill mites Dermoglyphus passerinusGaud, 1974 (Analgoidea: Dermoglyphidae) and feather mites Strelkoviacarus sp.(Analgidae: Anomalginae), in domestic canaries (Serinus canaria domestica) (Linnaeus, 1758) (Passeriformes: Fringillidae) in Mexico City, Mexico. Description of the case, the feather and skin lesions, and findings associated with the infection are presented. This manuscript aims to contribute to the knowledge of mite species that can affect the plumage of Serinus canaria domestica; as well as to the diagnosis and control of these infestations.

Absorption and deposition of xanthophylls in broilers challenged with three dosages of Eimeria acervulina oocysts.

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) sporulated oocysts of E. acervulina by gavaging at 21 d. There were 4 replicate pens (2 male and 2 female) per group. 3. Plasma xanthophyll (PX) and skin yellowness (SY) were measured in live birds weekly. At 42 d of age, SY was measured in the breast and abdomen after chilling and in the breast 24 h post-processing on refrigerated carcasses. 4. In general, in all challenged treatments, and for the duration of the study, the average PX decreased by 0.02 µg/ml (R(2) = 61.6%) for every 1000 inoculated oocysts, whereas PX increased by 1.26 µg/ml/d in uninfected birds. 5. The average SY in live birds from 21 to 42 d of age decreased by 0.019 b*/every 1000 oocysts administered, while SY of uninfected controls increased by 0.57 b*/d. It was also noted that in all treatments females had a greater SY (6.17 b*) than males for the duration of the study. The SY of the breast and abdomen was correlated (r = 0.76) in chilled carcasses. Breast SY in 24 h refrigerated carcasses was greater in the control group and for female birds. 6. Oocyst excretion was different between inoculated treatments only on 7 d post-inoculation (PI). Coccidia lesion scores in the duodenum averaged 1+ in infected birds and 2+ in birds given the highest oocyst dose.

Blood acid-base and plasma electrolyte values in healthy ostriches: the effect of age and sex.

The effect of age and sex on blood acid-base and plasma electrolyte values was determined in venous blood samples from 45 clinically healthy ostriches (Struthio camelus) from 26 days to 6 years of age. Animals were divided by age into four groups and the group of adults was divided by sex into two subgroups. Blood samples were collected without sedation. There was a significant (P<0.05) age difference in blood values of base excess (BE), plasma HCO(3)(-), total CO(2) (TCO(2)), Na(+), K(+), Cl(-) and anion gap (AG). The highest plasma concentrations of Na(+), Cl(-) and value of AG were found in adult ostriches with a steady decrease to chicks. A significant (P<0.05) sex difference in adult animals with higher blood pH, lower blood values of pCO(2), BE, plasma concentrations of HCO(3)(-), TCO(2) and K(+) was found in females. We concluded that blood acid-base values and plasma electrolyte concentrations in ostriches are affected by age and sex.