55 documents found, page 1 of 6
Feeding colostrum based on birth weight improves dairy calves’ passive immuniza...
Silva, Flávio; Silva, Severiano; Conceição, Cristina; Ramalho, Joana; Caetano, Pedro; Martins, Luís; Pereira, Alfredo; Cerqueira, JoaquimCalves are born agammaglobulinemic, and thus, they need an adequate volume of colostrum right after birth. Good quality colostrum can be limited in a dairy farm, depending on several environmental and management factors. Also, the right amount of colostrum that a calf should consume is not entirely defined. In this work, we aimed to study the effect of the volume of colostrum fed by kg of birth weight (BW) in t...
Falha na transferência de imunidade passiva em vitelos – avaliação no 1º, 2º e ...
Silva, Flávio; Ramalho, Joana; Caetano, Pedro; Martins, Luís; Conceição, Cristina; Pereira, Alfredo; Cerqueira, Joaquim; Silva, SeverianoIntrodução e objetivos: É cada vez mais comum a monitorização da transferência de imunidade passiva nas explorações leiteiras. O método de referência consiste na determinação por imunodifusão radial, da concentração de IgG sanguínea às 24h de vida, ocorrendo falha na transferência de imunidade passiva (FTIP) abaixo dos 10 mg/mL. No entanto, este método não está acessível à generalidade dos produtores. A medição...
Efficiency and Sustainability in Ruminants’ Livestock Systems: A Case Study of ...
Carreira, Emanuel; Silva, Flávio; Serrano, João; Geraldo, Ana; Infante, Paulo; Charneca, Rui; Conceição, Cristina; Pereira, AlfredoThe Montado (Portugal)/Dehesa (Espanha), a unique agro-sylvo-pastoral ecosys tem in the Mediterranean region, offers a valuable model for sustainable ruminant livestock production. This chapter explores the efficiency and sustainability of this system, with a particular focus on dryland pastures and grazing practices. Extensive livestock systems in the Montado, defined by their low-input and low-output approach...
An observational study of the microbiological quality of bovine colostrum fed t...
Silva, Flávio; Laranjo, Marta; Silva, Severiano; Conceição, Cristina; Cerqueira, JoaquimThis study aimed to evaluate the microbiological quality of colostrum on three dairy farms with different colostrum management hygiene practices and to compare it with the current colostrum quality guidelines. On farm A, colostrum was fed raw, while on farms B and C it was heat treated. On farms A and B, the feeding equipment was cleaned manually, while on farm C, an automated cleaning system was used. Samples ...
Rockrose and quebracho condensed tannins have a minor impact on the fatty acid ...
Jerónimo, Eliana; Guerreiro, Olinda; Soldado, David; Fialho, Letícia; Cachucho, Liliana; Garrido, Ana; Conceição, Cristina; Bessa, Rui; Silva, JoséThis study was carried out to test the hypothesis that the inclusion of condensed tannins (CT) from rockrose (Cistus ladanifer L.) and quebracho (Schinopsis lorentzii) in dairy goat diets supplemented with vegetable oil rich in polyunsaturated fatty acids (PUFA) can increase the potentially healthy fatty acids (FA) in milk and cheese fat, without compromising animal performance and milk and cheese composition. ...
Impact of different Cynara cardunculus L. extracts on the physicochemical, micr...
Alvarenga, Nuno; Fernandes, Jaime; Gomes, Sandra; Fidalgo, Liliana; Santos, Teresa; Conceição, Cristina; Dias, JoãoThis study aimed to evaluate the impact of different Cynara cardunculus L. extracts on the physicochemical, microbial, and sensory properties of PDO Serpa cheese, including moisture content, texture, nitrogen fractions, fatty acid profile, microbial characteristics, and overall acceptance. Cheese samples were produced in two dairies (C and G) with three cardoon coagulants (J, C, and G) and analyzed at the begin...
Immune, stress, and redox status biomarkers in newborn calves: Dynamics in seru...
Silva, Flávio; Cerón, José; Conceição, Cristina; Pardo-Marin, Luis; Munoz, Alberto; Cerqueira, Joaquim; Severiano, José CruzThis study investigated serum and saliva immunity, stress, and redox status biomarkers in dairy calves during the f irst week of life. Blood and saliva samples were collected from 20 calves on days 0, 1, 2, and 7 for the analysis of biomarkers related to innate immunity (myeloperoxidase, calprotectin), cellular (adenosine deaminase), humoral immunity (gamma-glutamyl transferase), stress ( α-amylase) and redox s...
Serum and saliva immunoglobulin (immunoglobulin G, immunoglobulin A, and immuno...
Silva, Flávio; Lamy, Elsa; Conceição, Cristina; Cerqueira, Joaquim; Ramalho, Joana; González-Cabrera, Marta; Caetano, Pedro; Martins, LuísThe transfer of passive immunity is essential to ensure the health and welfare of new-born calves. Although the dynamics of serum Ig concentrations in these animals are well-described, data about saliva Ig are limited. This study aimed to evaluate serum and saliva Ig (i.e., IgG, IgA, and IgM) concentrations during the first week of life in healthy and sick calves. Blood and saliva samples were collected from 20...
An Observational Study of the Microbiological Quality of Bovine Colostrum Fed t...
Silva, Flávio; Laranjo, Marta; Severiano, Silva; Conceição, Cristina; Cerqueira, JoaquimThis study aimed to evaluate the microbiological quality of colostrum on three dairy farms with different colostrum management hygiene practices and to compare it with the current colostrum quality guidelines. On farm A, colostrum was fed raw, while on farms B and C it was heat treated. On farms A and B, the feeding equipment was cleaned manually, while on farm C, an automated cleaning system was used. Samples ...
Predicting Body Weight in Pre-Weaned Holstein–Friesian Calves Using Morphometri...
Silva, Flávio; Carreira, Emanuel; Ramalho, Joana; Correia, Tomás; Meira, Marília; Conceição, Cristina; Silva, Severiano; Pereira, AlfredoRegularly weighing calves helps to assess the efficiency of the rearing period and contributes to animal welfare by allowing more precise feeding and medication application in dairy farming, but many farmers do not weigh their calves regularly. Improving the feasibility of this process is, therefore, important. The use of morphometric measurements has been used to estimate the weight of cattle. However, many st...