Semina: Ciências Agrárias最新文献

{"title":"Resposta imune induzida pelo sorotipo Massachusetts e variante BR do vírus da bronquite infecciosa em frangos de corte","authors":"Priscilla Maria Cavalcante Rocha, Maria Jacqueline Gomes de Barros, J. Bandeira, Rsmm Morais, A. L. Silva, Iza Jamile Moreira Vilar Pereira, J. Braga, F. Souza, J. Evêncio-Neto","doi":"10.5433/1679-0359.2024v45n4p1095","DOIUrl":"https://doi.org/10.5433/1679-0359.2024v45n4p1095","url":null,"abstract":"O objetivo deste estudo foi avaliar a virulência e a resposta imune em frangos de corte vacinados com o sorotipo Massachusetts H120 e variante BR através da análise sorológica, histomorfométrica e histopatológica da mucosa traqueal. O experimento utilizou 162 pintos de um dia, alojados em blocos aleatórios em dois recintos com temperatura e luz controladas. Os sorotipos Massachusetts e variante BR da bronquite, ambos foram administrados pela via ocular e spray. Para análise da resposta humoral foi utilizado o teste ELISA, as coletas de sangue foram realizadas aos quatro, sete, 14, 21 e 28 dias de idade e um perfil de resposta imune foi criado para cada grupo vacinal de acordo com a via de administração baseado na média geométrica de titulação (GMT). Fragmentos de traqueia foram coletados aos quatro, sete e 14 dias de idade e processados de acordo com o protocolo histológico de rotina.  As mensurações histomorfométricas foram submetidas ao teste ANOVA com teste post hoc de Tukey (p < 0.05). Os GMTs obtidos com o sorotipo H120 e BR com diferentes vias de administração foram semelhantes em termos de resposta humoral. Foram encontradas diferenças histomorfométricas significantes (p < 0.05) entre os sorotipos e as vias de administração da vacina. O grupo H120 teve maiores escores de lesão comparados ao grupo BR em todas as idades analisadas. Os achados demonstram que a variante BR tem menor reação pós vacinal e melhor proteção homóloga com o desafio enfrentado nas atividades avícolas no Brasil.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":"18 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141835996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Desempenho reprodutivo, características da lactação e medidas biométricas de caprinos Manavlı","authors":"Aykut Asım Akbas, Ozkan Elmaz, Mustafa Saatcı, Can Metin Yazıcı","doi":"10.5433/1679-0359.2024v45n4p1065","DOIUrl":"https://doi.org/10.5433/1679-0359.2024v45n4p1065","url":null,"abstract":"This study determined reproductive performance, milking traits and body measurements in 630 Manavlı goats that were reared purely in the Denizli province of Türkiye in six goat flocks. In this study, live weights and zoometrical body measurements of does and bucks were defined. Additionally, flock reproductive traits and milk yield were determined for six flocks. Overall, birth rate, twin birth rate, kidding rate and litter size in six flocks were determined as 98.34%, 43.42%, 1.41 and 1.44, respectively. The mean of the lactation milk yield, lactation period and  daily milk yield were 160.48 kg, 198 days and 0.810 kg, respectively. The live weights of does ranging in age from 4.1 to 4.7 were between 74.59 and 86.30 kg, while the live weights of bucks ranging in age from 2.1 to 2.7 were between 101.19 and 118.23 kg . Some body measurements of does, such as height at withers, rump height, rump width, body length, heart girth, ear length, tail length, and front and back wrist girth, were measured as 92.80, 93.07, 22.86, 91.97, 105.02, 26.83, 20.19, 12.35 and 12.31 cm,  respectively, before mating season. The same values at the abovementioned period were measured  as 98.27, 98.71, 23.87, 100.48, 109.89, 26.97, 22.30, 14.46 and 14.41 cm, respectively. This study is the first research related to Manavlı goats, for which no features have been reported to date. The obtained results will help to contribute to livestock diversity.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":"50 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141837518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pre-defoliation canopy height for signal grass ‘Basilisk’ in silvopastoral systems","authors":"Victor Augustus Vasconcelos de Oliveira, R. B. D. Silva, A. Veloso, Matheus Almeida Alves, M. M. D. Santos, R. A. C. Passetti, Lívia Vieira de Barros, M. Mourthé, Manoel Eduardo Rozalino Santos, T.G.S. Braz","doi":"10.5433/1679-0359.2024v45n4p1081","DOIUrl":"https://doi.org/10.5433/1679-0359.2024v45n4p1081","url":null,"abstract":"The objective of this study was to compare the response of Urochloa decumbens cv. Basilisk pastures in monoculture and silvopastoral systems (SPS), and to determine the most suitable pre-defoliation canopy height for managing this species in SPS. Four pre-defoliation canopy heights (20, 30, 40, and 50 cm) were tested for signal grass in SPS, alongside a control treatment involving defoliation at 20 cm in full sun. The experiment was conducted using a randomized block design with four replicates. The forage accumulation rate was higher in monoculture (36.5 kg ha-1 day-1 of DM) compared to the silvopastoral system (22.0 kg ha-1 day-1 of DM), and there was no significant effect of pre-defoliation canopy height within the SPS. The density of tillers in monoculture was comparable to that observed in canopies managed at a height of 50 cm within the SPS. Leaf mass and leaf percentage were maximized at heights of 40 cm and 50 cm, respectively. Neither the cultivation system nor the pre-defoliation canopy heights in the SPS influenced the fiber and protein content. Leaf accumulation and mass were higher in monoculture, but the cultivation system did not affect the chemical composition of the forage. Heights between 40 cm and 50 cm in the SPS should be used to maximize tillering, mass, and leaf percentage of signal grass ‘Basilisk’. The chemical composition of the produced forage did not undergo significant changes, neither between systems nor across pre-defoliation heights.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141837412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efeitos do uso prolongado de meloxicam em equinos hígidos: achados clínicos, laboratoriais, gastroscópicos e eletrocardiográficos","authors":"Dinamérico de Alencar Santos Júnior, Caio Victor Damasceno Carvalho, Maynara Kalya Ferreira Lima, E. G. D. Miranda Neto, P. Escodro","doi":"10.5433/1679-0359.2024v45n4p1047","DOIUrl":"https://doi.org/10.5433/1679-0359.2024v45n4p1047","url":null,"abstract":"Non-steroidal anti-inflammatory drugs are extensively used in veterinary practice. COX-2 inhibitors are considered to be safer than non-selective inhibitors; however, there are few studies address of their long-term use in equine species. The goal of this study was to identify the possible adverse effects of meloxicam (a preferential COX-2 inhibitor) in healthy horses, administered at a dose of 0.6 mg/kg, orally, once a day, for 28 days. A paired test was performed with seven animals, and the clinical, hematological, biochemical, and gastroscopic parameters, as well as bleeding time, were evaluated in five timepoints and an electrocardiogram at three timepoints. No relevant adverse effects were observed in terms of the parameters evaluated. Significant differences were found in heart rate, AST and P wave duration, segmented neutrophils (%), and the levels of erythrocytes, hemoglobin, hematocrit, and MCH, compared with these parameters at T0; however, no animal manifested clinical alterations. Gastroscopy revealed discrete lesions (Grade 1) in the squamous gastric mucosa on day 14 of treatment in all animals; however, at the end of the study (day 28) these lesions had regressed to grade 0 in three of the horses and remained at grade 1 in the other four animals. Based on these results, we conclude that the use of meloxicam at a daily dose of 0.6 mg/kg, orally, for 28 consecutive days, did not cause relevant adverse effects in healthy horses.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":"44 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141840732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Agrobio-economic return in radish–coriander intercropping under green manuring and population densities","authors":"Gerlani Alves da Silva, F. B. Bezerra Neto, Jailma Suerda Silva de Lima, Francisca Karla Kelly da Silva Lino, E. A. D. Silva, Joaquim da Silva Assis Filho, V. A. D. S. Lino, Elizângela Cabral dos Santos","doi":"10.5433/1679-0359.2024v45n3p689","DOIUrl":"https://doi.org/10.5433/1679-0359.2024v45n3p689","url":null,"abstract":"Radish and coriander are vegetables that complement each other when intercropped under organic fertilizer and the ideal density of the component crops. In view of this, this study aimed to evaluate the treatments, similar amounts of green manure and population densities of coriander in the biological parameters of the radish–coriander intercrop and determine the interaction between these treatments that provides the greatest economic return in a semi-arid environment. The experimental design used was randomized blocks, with treatments arranged in a 4 × 4 factorial scheme with four replications. The first factor consisted of Merremia aegyptia and Calotropis procera biomass amounts in the proportion of 50% for each green manure at doses of 20, 35, 50 and 65 t ha−1 on a dry basis. The second factor comprised four coriander population densities of 400, 600, 800 and 1000 thousand plants ha−1. The radish and coriander cultivars planted were ‘Crimson Gigante’ and ‘Verdão’, respectively. Significant agro-biological returns from this radish–coriander intercrop were obtained at a land equivalent ratio of 2.00, intercropping advantage of 11.39, canonical variable Z score of 2.45, radish aggressivity over coriander of 1.04, and actual yield loss of 2.15 with the incorporation of 65 t ha−1 of hairy woodrose and roostertree into the soil using a coriander population density of 1 million plants ha−1. The greatest economic return from radish–coriander intercropping (107,278.10 BRL ha−1) was achieved with the application of 25.88 t ha−1 of green manure biomass to the soil and a coriander population density of 1 million plants ha−1.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":" 45","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141128520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efeitos hemodinâmicos e respiratórios em ovinos submetidos a quatro modalidades de ventilação e anestesiados com isoflurano ou propofol","authors":"Luara da Rosa, Amarildo Oliveira Lyra De Souza, B. Regalin, D. Regalin, F. Comassetto, C.D.L. Cancellier, S. J. Ronchi, Nilson Oleskovicz","doi":"10.5433/1679-0359.2024v45n3p713","DOIUrl":"https://doi.org/10.5433/1679-0359.2024v45n3p713","url":null,"abstract":"O objetivo deste estudo foi avaliar diferentes modalidades ventilatórias em ovinos anestesiados com isoflurano ou propofol. Foram utilizadas 12 ovelhas, adultas, mestiças, com 12 meses de idade, pesando 32±5 kg, comprovadamente hígidas. Após instrumentação com os animais conscientes em decúbito lateral direito, foi administrado morfina (0,3 mg kg-1) e detomidina (20 mcg kg-1) como MPA. Foram induzidas à anestesia geral com propofol (4 mg kg-1) e intubadas. Neste momento, foram alocadas em dois grupos: PG (n=6), manutenção com infusão contínua de propofol (0,5 mg kg min-1), e IG (n=6) com anestesia inalatória com isoflurano (1,3 V%). Todas foram mantidas por 30 minutos em cada modalidade ventilatória: ventilação espontânea (VE), ventilação mecânica ciclada a volume (VV), ventilação mecânica ciclada a pressão (VP) e ventilação mecânica ciclada a pressão com PEEP (VPP). A FC e o IC foram maiores em IG e já o IRVS foi maior em PG. Os valores de hemoglobina, fração de shunt intrapulmonar e o volume corrente foram maiores no PG. Os animais apresentaram alcalose metabólica em ambos os grupos. O isoflurano promoveu maior hipotensão, diminuição da complacência pulmonar, aumento da resistência das vias aéreas, menores valores de PaO2 e maiores valores de PaCO2 em todas as modalidades ventilatórias. A VPP promoveu maior complacência pulmonar e índice de oxigenação, maiores valores de PaO2 e menores valores de shunt intrapulmonar. Conclui-se que o propofol e a VPP promoveram maior estabilidade hemodinâmica em ovelhas.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":" 93","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141128239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of feeding frequency on growth, hematology, blood biochemistry, liver histology, and intestinal microbiota in the Oscar (Astronotus ocellatus)","authors":"N. Lopera-Barrero, F. P. D. Souza, E. C. S. D. Lima, Lucas Mendonça Odebrecht, V. C. F. Pandolfi, Cindy Namie Seino Leal, U. P. Pereira, A. C. E. Pupim, Paulo César Meletti, Eduardo José A Araújo","doi":"10.5433/1679-0359.2024v45n3p727","DOIUrl":"https://doi.org/10.5433/1679-0359.2024v45n3p727","url":null,"abstract":"The Oscar (Astronotus ocellatus) is an important Amazonian species with high production potential in fish farms and commercial value for aquarists. However, limited information on the feeding characteristics, such as the frequency of daily feeding, is available for this species in captivity. Therefore, the objective of this study was to evaluate the effects of feeding frequency on growth, hematology, blood biochemical parameters, liver histology, and intestinal microbiota parameters of juvenile Oscars. Four treatments were tested, consisting of fish fed at a feeding rate of one (T1), two (T2), three (T3), or four (T4) times daily with 1% of their biomass. There were no significant differences (p > 0.05) between treatments for growth and hematological parameters. T1 showed lower serum albumin values than T2 and T4 (p < 0.05) and higher hepatosomatic index values than T4 (p < 0.05), which was corroborated by the hepatocyte nucleus count. Intestinal microbiota analysis revealed higher taxon richness in T4 than in T1 (p < 0.05). Lower feeding frequencies (T1) positively influenced the deposition of hepatic energy reserves and decreased albumin production, possibly because of lower peptide absorption in the same treatment. Based on these results, feeding frequencies of two (T2), three (T3) and four (T4) times daily were the most suitable for juveniles of this species.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":" 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141128489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Epidemiologia de Ehrlichia canis: aspectos hematológicos, bioquímicos, fatores associados e moleculares em cães hígidos no município de Porto Seguro, Bahia, Brasil","authors":"Jamille Pinto dos Santos Carvalho, Ana Paula Fernandes Calazans, Gabriela Mota Sena de Oliveira, Lilia Fernandes Alves, Larissa da Mata Santos, Fernando Bellice Silva, Alexandre Dias Munhoz","doi":"10.5433/1679-0359.2024v45n3p659","DOIUrl":"https://doi.org/10.5433/1679-0359.2024v45n3p659","url":null,"abstract":"Este estudo observacional transversal teve como objetivo investigar a frequência, fatores associados e avaliar as alterações hematológicas e bioquímicas da infecção por E. canis em 396 cães saudáveis e domiciliados do município de Porto Seguro, Bahia. Além da coleta de amostras de sangue, foram obtidas informações adicionais sobre características intrínsecas e extrínsecas dos cães por meio de entrevistas semiestruturadas com seus tutores, a fim de identificar os fatores associados à infecção. Foi realizada a extração de DNA das amostras de sangue e pesquisa de E. canis pela técnica de nested PCR. A frequência de E. canis encontrada foi de 30,8% (122/396). Observou-se que a trombocitopenia (p<0,05) foi a alteração hematológica mais evidente entre os cães infectados por E. canis. Verificou-se que cães positivos possuem maior probabilidade de terem trombocitopenia, leucopenia e anemia em comparação aos animais negativos (p<0,05). Por meio do modelo de regressão logística, identificou-se que a presença de carrapatos (odds ratio [OR] = 1,66; intervalo de confiança [IC]: 1,05 - 2,63; valor p = 0,03) e residir na zona urbana (OR = 1,90; IC: 1,19 - 3,04; valor p = 0,007) foram fatores de risco para a infecção, enquanto morar próximo a áreas desmatadas (OR = 0,56; IC: 0,31 - 0,99; valor p = 0,05) e ter hábito domiciliar (OR = 0,51; IC: 0,31 - 0,85; valor p = 0,01) foram identificados como fatores de proteção. A elevada frequência de E. canis, combinada com a trombocitopenia e fatores associados que sinalizam para adoção de medidas de controle de carrapatos e diagnóstico da infecção, contribuem para uma melhor compreensão da epidemiologia local da infecção.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":" 42","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141128623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermographic analysis of physiological conditions and after exercise in classic equestrian horses","authors":"Guilherme Gonçalves Costa, Roberta Passini","doi":"10.5433/1679-0359.2024v45n3p677","DOIUrl":"https://doi.org/10.5433/1679-0359.2024v45n3p677","url":null,"abstract":"Few studies have associated horse skin temperature with the thermal environment, physiology and exercise. This study aimed to use infrared thermography to analyze thermoregulation in horses during training and the efficiency of bathing time in restoring normal physiological conditions. A completely randomized design was used, with 2 treatments and 6 replications. The treatments were different bathing times, after exercise: BE – Before exercise (Control – resting animal); T2 – 2-minute shower, after exercise; T5 – 5-minute shower, after exercise. Six Brazilian Sport (BH) and six Thoroughbred (TB) horses were studied, with average age and weight of 8.5 years and 415 kg respectively, ridden over a classic showjumping course for 50 minutes. The variables were collected from 13h00 to 15h00 over 3 nonconsecutive days, before jump training, prior to bathing (post-training) and after bathing. The environmental variables (wet bulb temperature, black globe temperature, relative air humidity and dry bulb temperature) were determined in the external (track) and internal (bathroom) environments. Thermal comfort indexes were calculated: Temperature and Humidity Index (THI), Black Globe Temperature and Humidity Index (BGHI). Were collected the rectal temperature, respiratory rate and body surface temperature. A significant effect was observed for the rectal temperature, respiratory rate and surface temperature (P<0.05) between the pre- and post-training and before and after bathing. Training for around 50 minutes increased respiratory rate as well as rectal and skin temperatures. Bathing times of 2 or 5 minutes promote equivalent reductions in the animals' respiratory rate and skin temperatures, reaching values below those observed before training. The rectal temperature of the animals remained high even after bathing, indicating delayed recovery in relation to the other variables.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":" 62","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141128503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of different production systems on health, zootechnical and metabolic parameters in Holstein calves in the extreme south of Brazil","authors":"R. S. Teixeira, Murilo Scalcon Nicola, Gustavo Felipe da Silva Sousa, U. S. Londero, E. G. Xavier, F. D. Del Pino, V. Rabassa, M. N. Corrêa","doi":"10.5433/1679-0359.2024v44n2p625","DOIUrl":"https://doi.org/10.5433/1679-0359.2024v44n2p625","url":null,"abstract":"The aim of this study was to evaluate the incidence of diseases as well as metabolic and zootechnical parameters in Holstein calves maintained in individual or collective housing systems in the extreme south of Brazil. One hundred calves were included immediately after birth and monitored for 90 days. Animals were randomly divided into two groups: individual stalls group (ISG; n=50) and collective stalls group (CSG; n=50). ISG calves were individually housed in 1.2m² wood pens and received 6 L of milk/day and concentrate food and water ad libitum for 90 days. Calves in the CSG were housed in groups of up to 25 animals, in a total of two stalls containing one animal per 3 m2. CSG calves received up to 8 L of milk/day at 0-15 days, milk ad libitum at 15-40 days, 7.2 L of milk. /day at 40-60 days, and gradual weaning at 60-90 days with concentrate food and water ad libitum, using an automatic feeder. In both groups, Zootechnical  parameters (weight, thoracic perimeter, height at the withers, and rump width) were measured weekly during the first 28 days and once every 15 days until weaning. Blood samples were retrieved weekly during the first 28 days. Metabolic parameters evaluated in this study were total calcium, beta-hydroxybutyrate (BHBA), free fatty acids (FFA), and glucose. The animals were monitored daily for clinical signs of diseases diarrhea and respiratory symptoms. General morbidity was higher in CSG 92% compared to ISG 74% (p<0.05). We observed increased diarrhea-related morbidity and a higher rate of recurrence in the ISG (50% and 60%, respectively; p<0.05) compared to those in the CSG (both 20%, p<0.05 between groups). The morbidity due to bronchopneumonia was higher in the CSG (92%) than in the ISG (74%, p<0.05). Recurrence of bronchopneumonia and mortality were similar between groups (p>0.05). Glucose, FFA, and BHBA concentrations were higher in the ISG (p<0.05) and total calcium higher in CSG (p<0.05). Finally, the weight and thoracic perimeter were higher in the CSG than those in the ISG, whereas the height and, rump width, at the withers was higher in the ISG than that in the CSG (p<0.05). In conclusion, animals raised in a collective system with automatic feeders exhibited less diarrhea and increased serum calcium as well as improved zootechnical development, although they had a higher incidence of bronchopneumonia.","PeriodicalId":21921,"journal":{"name":"Semina: Ciências Agrárias","volume":"58 37","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141009392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}