Effects of heat stress on global DNA methylation and blood parameters of two strains of laying hens.

This study aimed to determine the global levels of DNA methylation and alterations in hematological and electrolytic parameters of two strains of laying hens subjected to heat stress and thermal comfort in climatic chambers. The experiment was conducted in two climate chambers with 192 laying hens of two strains: Dekalb White and Dekalb Brown. After the seven-day adaptation period, each climate chamber was programmed to a thermal condition for 28 consecutive days: Comfort (THI = 73.

In vivo anthelmintic activity of hydroethanolic extract of Piper cubeba fruits in sheep naturally infected with gastrointestinal nematodes.

Parasitic infections caused by gastrointestinal nematodes (GINs) are the main cause of production losses in small ruminants, especially sheep. Haemonchus contortus is the most common nematode in tropical regions. The indiscriminate use of synthetic anthelmintics to control helminthosis has led to the development of resistant parasites.

Anthelmintic resistance of horse strongyle nematodes to ivermectin in São Paulo state, Brazil.

The indiscriminate use of drugs to control gastrointestinal helminths in horses can lead to serious consequences for the animals, which represents a growing problem for health, animal welfare and productivity. Therefore, the present study aimed to evaluate the anthelmintic efficacy of ivermectin in naturally infected horses in the western region of the state of São Paulo. From May 2021 to April 2022, 123 naturally infected adult horses in 12 equine breeding farms (7 to 14 animals per farm) were evaluated with the fecal egg count reduction test.

Global genomic methylation related to the degree of parasitism in cattle.

The objective of the present study was to characterize a herd of 72 ½ Angus × ½ Nellore heifers, identify the resistant, resilient and susceptible animals to parasites, relate the overall DNA methylation of these animals with the degree of parasitism, evaluated by the egg count per gram of feces (EPG), Haematobia irritans count (horn fly) and Rhipicephalus microplus count (bovine tick). The experiment was carried out in a completely randomized design, containing 72 treatments, with each animal considered a treatment, and 11 repetitions, with each collection within a year considered a repetition. The data obtained from the counts of the evaluated parasites were subjected to statistical analysis using the SISVAR program, to classify heifers according to the degree of parasitism in low (resistant), intermediary (resilient) and high (susceptible) parasite load for infection by nematodes, infestation by ticks and flies.

A comparison of immunological, chemical and surgical castration of Nelore bulls.

The objective was to compare effects of immunological, chemical and surgical castrations on testicular characteristics, scrotal surface temperatures, sperm quality, and serum testosterone concentrations in Bos indicus bulls. Eighty Nelore bulls (∼20 mo) were grazed on pasture, fed a supplement and slaughtered at ∼480 kg. Bulls were allocated into four groups (n = 20/group).

Eficacy of ivermectin, moxidectin and febendazole in equine in Brazil.

The objectives of the present study were to evaluate the efficacy of three anthelmintic drugs, i.e. fenbendazole, ivermectin and moxidectin; to determine the genera and species of the most abundant strongyles; and to investigate parasite control measures used in herds of horses in the western region of the state of São Paulo, Brazil.

Parasitism in Angus x Nellore heifers in a silvopastoral system.

The influence of shade in the silvopastoral system on the performance and degree of parasitism by endo- and ectoparasites in Angus x Nellore heifers was assessed. The experiment was conducted with 72 heifers, with an initial mean weight of 276 ± 5.67 kg and 9 months of age, in a total area of 25 ha, divided into 12 paddocks, with three treatments and four replicates.

Evaluation of reduction in egg shedding of gastrointestinal nematodes in cattle following administration of anthelmintics.

To evaluate the necessary time and to identify the differences among anthelmintics for the reduction of parasite eggs shed in feces, five groups of cattle were treated with moxidectin, ivermectin, levamisole phosphate, and albendazole sulphoxide. Levamisole promoted a reduction in egg count per gram (EPG-R) of 97.4% after 24 hours, moxidectin 98.

[Occurrence of gastrointestinal parasites in fecal samples of cats in Andradina City, São Paulo].

The purpose of this study was to verify the occurrence of gastrointestinal parasites in fecal samples from cats of the Andradina city, SP. This work was carried out from March to November of 2007, and used 51 cats delivered to the Center of Zoonoses Control of that city. Techniques of Willis and Faust were used in the fecal examination and resulted in detection of Ancylostoma spp.