resUMo Objetivou-se simular pesos de suínos machos e fêmeas (de 1 a 154 dias de idade) através da distribuição de probabilidade uniforme num intervalo [a,b]. Foram ajustados os modelos de regressão (logístico, potência, tangente hiperbólica, gamma e polinomial cúbico) para explicar a possível relação do peso com o número de dias dos suínos. Verificou-se que os modelos logístico, gamma e polinomial cúbico apresentaram as melhores estimativas para explicar o comportamento do peso dos suínos machos e fêmeas. O modelo logístico apresentou R²= 0,975 e AIC (critério de informação de Akaike)=13,34 para os machos e R²= 0,9787 e AIC= 10,16 para as fêmeas. O modelo gamma apresentou grau de explicação de R²= 0,991 e AIC= 99,33 para os machos e R²= 0,9941 e AIC= 90,602 para as fêmeas, enquanto que o modelo polinomial cúbico apresentou R= 0,9995 e AIC=64,2 para os machos e R²= 0,9995 e AIC= 31,728 para as fêmeas. Optouse pelo modelo polinomial cúbico para explicar o comportamento do peso simulado dos suínos, pois o mesmo apresentou R² alto e baixo AIC além de menos parâmetros que os outros modelos. This study aimed to simulate data to the weight of boar and pig sows (1 to 154 days old) through the uniform probability distribution on an interval [a, b]. Five regression models (logistic, hyperbolic tangent, power, gamma and cubic polynomial) were adjusted to account for the possible weight ratio to tage of pigs in days. The logistic and gamma cubic polynomial models showed the best estimates to account for the weight of the behavior of boar and sow pigs. The logistic model showed R² = 0.975 and AIC (Akaike's information criterium)= 13.34 for boars and R²= 0.9787 and AIC= 10.16 for sows. The gamma model presented a degree of explanation of R²= 0.991 and AIC= 99.33 for boars and R²= 0.9941 and AIC= 90.602 for sows, while the cubic polynomial model showed R²= 0.9995 and AIC= 64.2 for boars and R²= 0.9995 and AIC= 31.728 for sows. the cubic polynomial model was chosen to explain the behavior of the simulated weight of the pigs, whose model showed the best fit with fewer parameters than the other models. Archivos de ZootecniaJournal website: https://www.uco.es/ucopress/az/index.php/az/ INTRODUÇÃO Na suinocultura têm-se desenvolvido estudos sobre curvas de crescimento, sabendo-se que programas de melhoramento genético aliado às pesquisas nutricionais, podem alterar o comportamento biológico do crescimento desses animais, pois modificando-se a estrutura genética de uma população e alterando comportamento alimentar, observam-se mudanças significativas na estrutura de uma raça ou espécie.Estudar o crescimento ou o desenvolvimento por meio de ajustamento de uma função que descreva todo o período de vida do animal, relacionando peso e idade, tem sido pesquisado por vários autores (Macedo et al., 2014;Morais et al., 2015;Texeira et al., 2012).A curva descrevendo uma sequência de medidas de determinada característica de alguma espécie ou indivíduo em função do tempo, geralmente peso, altura ou diâmetro, é chamada de curva de crescimento (...

The present objective was to investigate the presence of anti-equine viral encephalomyelitis (EVE) antibodies and the possible risk factors for its dissemination in horses raised in the East and West Potiguar mesoregions of the state of Rio Grande do Norte, Brazil. Serological diagnosis for neutralizing antibodies against Eastern (EEEV), Western (WEEV) and Venezuelan (VEEV). Equine viral encephalomyelitis was performed using a seroneutralization technique on 811 blood samples from horses from ninety properties and sixteen municipalities between July 2018 and February 2019. Factors associated with EVE were evaluated using an investigative epidemiological questionnaire, and the data were statistically analyzed using the Epi Info 3.5.2 software with a confidence level of 95%. The seroprevalence of anti-EVE antibodies was 14.2% (115), with 10.36% (84) for EEEV, 6.9% (56) for WEEV, and null for EVE. When analyzing risk factors, it can be concluded that horses raised in properties that do not clean installations and/or rent out their pasture are more likely to have anti-EVE antibodies. These results show evidence that horses raised in the East and West Potiguar mesoregions were exposed to EEEV and WEEV, thus reinforcing the importance of vaccination and serological survey of nonvaccinated horses as a means of monitoring the disease.

The Curraleiro, also called Pé-Duro, is the only naturalized bovine breed of Northeastern Brazil. The breed originated via admixture of different Iberian breeds that were introduced during the sixteenth century and the subsequent natural adaptations to the semi-arid environment. The introduction of zebu bovine breeds during the twentieth century led to the replacement of the Curraleiro, which is now on the brink of extinction. With the aim of supporting the establishment of a conservation programme, the present study focused on assessing the management of the existing Curraleiro populations. Data on 2 366 head of cattle were obtained by interviewing 22 owners of Curraleiro herds. The number of animals in the herds varied from 4 to 384. The average herd size was 131.4 (standard deviation = 120.3). All animals were bred under extensive conditions, without any supplementary feed, and in 50 percent of all cases without any specialized technical assistance. Data indicated that breeders maintain the cattle not for economic reasons, but because of tradition. The Curraleiro was characterized by the breeders as being resistant to water stress and parasites. The animals can be bred without feed supplements on all kinds of native-grass pastures. These characteristics, in addition to its low production costs, could make the Curraleiro attractive, especially for low-income families. RésuméLe bétail Curraleiro, aussi appelé Pé-Duro, représente la seule race bovine naturalisée du Nord-est du Brésil. La race s'est formée suite au croisement de différentes races ibériques introduites au cours du seizième siècle et par l'adaptation naturelle à l'environnement semiaride. Les races zébuines introduites pendant le vingtième siècle ont remplacé la race Curraleiro qui se trouve actuellement au bord de l'extinction. Afin de soutenir l'établissement d'un programme de conservation, cette étude s'est concentrée sur la caractérisation de la conduite des élevages de race Curraleiro encore existants. Les données de 2 366 animaux ont été obtenues en enquêtant 22 propriétaires de troupeaux Curraleiro. Le nombre d'animaux par exploitation a varié de 4 à 384. La taille moyenne des troupeaux était de 131,4 avec un écart type de 120,3. Tous les animaux ont été élevés dans des conditions extensives, sans aucun complément alimentaire, et dans le 50 pour cent des cas sans aucune assistance technique spécialisée. Les données indiquent que les éleveurs maintiennent la race non pas pour des raisons économiques mais par tradition. Les éleveurs ont souligné que la race Curraleiro est résistante au manque d'eau et aux parasites. Les animaux peuvent être élevés, sans aucune supplémentation alimentaire, sur la base de n'importe quel pâturage natif. Ces caractéristiques, liées aux faibles coûts de production, pourraient rendre la race Curraleiro attirante, en particulier pour les familles à faibles revenus. Mots-clés: Bos taurus, bétail Curraleiro, race naturalisée, Nord-est du BrésilResumen El ganado Curraleiro, también llamado Pé-Duro, constituye la única ra...

This study aimed to determine the prevalence and risk factors associated with the presence of anti-Leptospira spp. antibodies in horses reared in the Eastern and Western Potiguar mesoregion, State of Rio Grande do Norte, northeastern Brazil. Seven hundred and eighty-five animals (785) were used from 90 properties from 2018 to 2019. The serological diagnosis was performed by the microscopic agglutination technique (MAT), using a collection of live antigens composed of twenty serovars belonging to sixteen serogroups. Variable data associated with risk factors were obtained from questionnaires carried out to herd owners and statistically analyzed. The absolute and relative frequencies were determined by descriptive analysis and risk factors by univariate analysis of the variables using the Pearson’s chi-square test and Fisher’s exact test, when necessary, and then assessed by Poison regression. The positivity frequency among animals was 97.2% (763), and from all properties, there was at least one seropositive animal. The main reactive serogroup was Icterohaemorrhagiae (72.88%), followed by reactive animals to Australis (14,94%), Sejroe (4.43%), Shermani (2.77%), Autumnalis and Pomona (1.29%). It was observed occurrences lower than 1% to serogroups Canicola, Ballum, Grippotyphosa and Hebdomadis, with titles ≤400 in 78,97% of cases. The significant occurrence of seropositive horses and the serogroup Icterohaemorrhagiae predominance highlights the importance of vaccination and hygiene in Potiguares herds facilities to prevent leptospirosis cases and the consequent elimination of the agent in the environment.

No abstract