Optimal dietary energy and amino acids for gilt development: Growth, body composition, feed intake, and carcass composition traits

The objective of this study was to determine if body composition of developing gilts could be altered at the onset of estrus by ad libitum feeding diets differing in standard ileal digestible (SID) lysine and ME using levels that are within those used in practice by pig producers in the United States. Crossbred Large White × Landrace gilts (n = 1,221), housed in groups, were randomly allotted to 6 corn–soybean diets in a 2 × 3 factorial arrangement formulated to provide 2 SID lysine and 3 ME levels. Gilts received grower diets formulated to provide 0.86 (low) or 1.02% (high) SID lysine and 2.94 (low), 3.25 (medium), or 3.57 (high) Mcal of ME/kg from 100 d of age until approximately 90 kg BW. Then, gilts were fed finisher diets containing 0.73 (low) or 0.85% (high) SID lysine and 2.94 (low), 3.26 (medium) or 3.59 (high) Mcal of ME/kg until 260 d of age. The medium SID lysine and medium-ME diets were based on an informal survey from the U.S. commercial swine industry to obtain average levels that are currently being formulated for developing gilts. Gilts were weighed and backfat thickness and loin area were recorded at the beginning of the trial and then every 28 d. Feed intake (FI) was recorded as feed disappearance within the pen at 2-wk intervals. Lysine (g) and ME (Mcal) consumed were calculated based on diet formulations. At approximately 260 d of age, gilts were slaughtered and warm carcass weight and fat thickness were recorded. There were no differences between lysine or ME levels for growth and body composition, except for backfat, which was slightly greater for gilts fed a high-ME diet. Gilts fed high-ME diets had a lower FI but a greater ME intake compared with gilts fed low ME (P \u3c 0.05). Additionally, gilts fed the high-ME diet had lower FI and lysine intake per kilogram of BW gain when compared with gilts fed low- or medium-ME diets (P \u3c 0.05). However, there was no difference in the megacalories consumed per kilogram of BW gain among treatments (P \u3e 0.05). Carcasses from gilts fed the high-ME diet were 3.3 and 2.5 kg heavier than those from gilts fed the low- or medium-ME diets (P \u3c 0.05). Despite significant differences in the lysine:ME ratio in the diets, no changes in growth or body composition occurred, likely due to compensatory changes in FI in response to dietary ME content. Caloric efficiency (Mcal to deposit 1 kg of BW) was similar among treatments

Parameter Optimisation in Selective Laser Melting on C300 Steel

Additive manufacturing (AM) of metallic materials is increasingly being adopted in numerous sectors, such as biomedicine, aerospace or automotive industries, due to its versatility in the creation of complex geometries and the minimisation of material waste when compared to traditional subtractive methods. In order to ensure a reliable operation of these parts, however, an in-depth study of the effect of additive manufacturing on mechanical properties, including tensile, fatigue and fracture resistance, is necessary. Among the vast number of methods and materials, this project is focused in one of the most promising techniques for the industry: Selective Laser Melting (SLM) for the production of a tools steel, in particular C300 steel components for the automotive sector. The main objective of this paper is to optimise some of the key parameters in the printing process, such as laser power, laser speed and hatch spacing. These variables are essential to obtain parts with good resistance. To that purpose, tensile tests were performed in 3D printed specimens, and then elastoplastic properties were extracted, organised and analysed through a design of experiments for the subsequent output fitting using the response surface methodology.This research was funded by: INVESTUN/22/BU/0003 // BU-002-P20 // MU-21-UP2021-030

Evaluación de la prescripción profiláctica de omeprazol y ranitidina mediante la identificación de factores de riesgo de sangrado gastrointestinal

La información actual sobre el uso de inhibidores de la producción de ácido clorhídrico (inhibidores de bomba de protones y antagonistas de los receptores de histamina H2), en pacientes no críticos hospitalizados para la profilaxis de úlceras por estrés escontroversial. Con el fin de evaluar la pertinencia de este grupo de medicamentos en conformidad con el riesgo de sangrado gastrointestinal medido por la escala de Herzig et al. {Risk factors for nosocomial gastrointestinal bleeding and use of acid-suppressivemedication in non-critically ill patients, J. Gen. Intern. Med., 28(5), 683-690 (2013)}, se realizó un estudio observacional descriptivo longitudinal con recolección retrospectiva de la información, el cual incluyó todos los pacientes mayores de 18 años sin sangrado gastrointestinal y con más de tres días de hospitalización, en el servicio de medicina interna de un hospital de tercer nivel de Bogotá. Según esta escala, el 64% de los pacientes se clasificó en bajo riesgo, el 22,3% en medio-bajo, el 6,7% en medioalto,y el 6,7% en alto. La prescripción profiláctica de inhibidores de la secreción ácidase realizó en el 67% de los pacientes de bajo riesgo, en el 57% de los de medio-bajo y en el 100% de los pacientes de riesgo medio-alto y alto. Cerca de la mitad (55,35%) de los pacientes recibieron un antiulceroso sin requerirlo; por lo tanto, se recomiendarealizar actividades educativas dirigidas al personal prescriptor, con el fin de hacer un uso adecuado de este grupo de medicamentos.Current information on the use of inhibitors of the production of hydrochloric acid (proton-pump inhibitor (PPI) ATC A02BC and histamine H2 receptor antagonists (Anti H2) ATC A02BC) in non-critical patients for the prophylaxis of stress ulcers is controversial. A descriptive longitudinal observational study with a retrospective collection of information, that included patients over 18 years with more than three days of hospitalization in internal medicine, without active gastrointestinal bleeding using the scale of Herzig et al. {Risk factors for nosocomial gastrointestinal bleeding and use of acid-suppressive medication in non-critically ill patients, J. Gen. Intern. Med., 28(5), 683-690 (2013)}, to assess the risk gastrointestinal bleeding was carried out. According to the risk score, patients were classified 64% as low risk, 22.3% medium-low risk, 6.7% medium-high risk and 6.7% high risk. Prophylactic prescription inhibiting acid secretion was performed in 67% of patients at low risk, 57% in medium-low risk and 100% for patients with medium-high and high risk. More than half (55.33%) of the patients received a PPI/anti H2 without requiring it. Educational activities are recommended to the prescribing staff in order to make proper use of this group of drugs

Effect of feeding three lysine to energy diets on growth, body composition and age at puberty in replacement gilts

This study evaluated the effect of diets differing in standard ileal digestible (SID) lysine on lysine intake, growth rate, body composition and age at puberty on maternal line gilts. Crossbred Large White×Landrace gilts (n =641) were fed corn-soybean diets differing in SID lysine concentration (%, g SID lysine:Mcal ME); diets were not isocaloric. Gilts received three grower, finisher diet combinations: low (0.68% lysine grower, 0.52% lysine finisher), medium (0.79% lysine grower, 0.60% lysine finisher) or high (0.90% lysine grower, 0.68% lysine finisher). Grower diets were fed from 100 until 142 days of age, and finisher diets were fed until they reached 220 days of age. Body weight (BW), backfat thickness (BF), and loin depth (LD) were recorded every 28 days. From 160–220 days of age, gilts were exposed daily to vasectomized boars and observed for behavioral estrus. Gilts fed the low lysine diet had lower average daily gain and BW (P \u3c 0.05), but not fat depth:LD ratio. The percentage of gilts that displayed natural estrus by 220 days of age was low but not different among dietary treatments (low 27.7%, medium 31.0% and high 37.7%, respectively; P=0.1201). Gilts fed the high and medium diets reached puberty 10 and 6 days earlier, however, than gilts fed the low lysine diet (P \u3c 0.05). The rate of puberty attainment may have been less because all gilts contracted porcine epidemic diarrhea (PEDv) just as boar exposure was to begin for the first group of gilts. Results from the present study indicate that growth rate and age at puberty can be altered by ad libitum fed diets that differ in SID lysine concentration

Stress transfer quantification in gelatin-matrix natural composites with tunable optical properties

© 2015 American Chemical Society.This work reports on the preparation and characterization of natural composite materials prepared from bacterial cellulose (BC) incorporated into a gelatin matrix. Composite morphology was studied using scanning electron microscopy and 2D Raman imaging revealing an inhomogeneous dispersion of BC within the gelatin matrix. The composite materials showed controllable degrees of transparency to visible light and opacity to UV light depending on BC weight fraction. By adding a 10 wt % fraction of BC in gelatin, visible (= 550 nm) and UV (= 350 nm) transmittances were found to decrease by ∼35 and 40%, respectively. Additionally, stress transfer occurring between the gelatin and BC fibrils was quantified using Raman spectroscopy. This is the first report for a gelatin-matrix composite containing cellulose. As a function of strain, two distinct domains, both showing linear relationships, were observed for which an average initial shift rate with respect to strain of -0.63 ± 0.2 cm-1%-1 was observed, followed by an average shift rate of -0.25 ± 0.03 cm-1%-1. The average initial Raman band shift rate value corresponds to an average effective Youngs modulus of 39 ± 13 GPa and 73 ± 25 GPa, respectively, for either a 2D and 3D network of BC fibrils embedded in the gelatin matrix. As a function of stress, a linear relationship was observed with a Raman band shift rate of -27 ± 3 cm-1GPa-1. The potential use of these composite materials as a UV blocking food coating is discussed