Plant-derived extracts feed-addition and packaging type influence consumer sensory perception of pork

This paper investigates whether the combination of the addition of extracts derived from plants (plants derived extracts, PDE) to pork feedstuff and the meat conservation conditions (packaging and time exposure) affect consumers’ perception of pork quality, studied by means of visual appraisal, purchase intention and a home test. The three PDE groups were control, garlic extract and blended oil composed by carvacrol, timol, cynamic aldehide and eugenol extracts. Meat was packed in film, vacuum or modified atmosphere (MAP) packaging. A visual test was designed comprising a four-day storage step followed by a four-day exposure step in a refrigerated island display case. All studied effects influenced visual appraisal scores, being time exposure and packaging effects more noticeable than PDE or pig-sex effects. Meat from MAP scored higher than the rest. Scores decreased as exposure time increased, but this evolution was less perceptible in vacuum packaging and was faster for meat from the garlic group. Only gender affected the visual appraisal scores, with women scoring higher than men. Neither PDE addition nor pig sex affected to purchase intention whereas both exposure time and packaging type did. A maximum of 2 days of exposure would be recommended. In the home-test, meat from male pigs obtained higher scores than meat from female pigs, and none of the consumer-related effects influenced the given scores

Sex does not affect the colour, shear stress, and lipid oxidation of pork meat, but feed-added plant-derived extracts, storage time and packaging type do

Essential plant oils added to products, packaging or animal feed are used as a method of preserving food quality because they extend the shelf-life of meat due their antioxidant and/or antimicrobial capacity. This action can be achieved with the correct packaging that preserves the meat’s quality and safety. This study investigates the effects of plant-derived extracts (PDE) on the meat quality and shelf-life of pork packaged in vacuum or modified atmosphere packaging (MAP). Thirty-six barrows and thirty-six gilts were allocated into three experimental groups: the control, garlic extract (1 kg/ton of feed) and oregano–rosemary oil (2 kg/ton of feed) with the same base-diet. Two packaging were used: vacuum and a commercial MAP (70% O2, 30% CO2). The meat fat content, pH, colour, TBARS values and Warner–Bratzler shear stress were investigated. The sex of the animals did not affect any of the studied variables, whereas PDE affected some of the colour variables and the shear stress; both the packaging type and the storage time affected the colour variables, lipid oxidation and shear stress. Vacuum-packed meat was more stable in terms of colour, lipid oxidation and shear stress than MAP-packed meat

The effect of consumer involvement in light lamb meat on behavior, sensory perception, and health-related concerns

Involvement can explain behavioral consequences, such as consumer decision-making and consumption. The first aim of this study is to identify the profiles of consumers based on their involvement in light lamb meat. The second aim is to study the influence of involvement on consumers’ attitudes, behaviors, beliefs, preferences, quality cues, and sensory perception regarding light lamb meat. Two consumer profiles are identified. The first cluster includes consumers who enjoyed eating light lamb meat, were conscious of their self-image, and perceived the consequences of poor choices; these consumers also perceived the probability of making an incorrect choice as high. The second cluster includes consumers who truly loved eating lamb meat, were also conscious of their self-image, and perceived the consequences of poor choices; however, these consumers were confident in not making incorrect choices. Although both involvement-based profiles showed high involvement in light lamb meat, it can be concluded that the second cluster had a higher involvement. In general, the involvement-based profiles did not influence health-related attitudes, preferences, or sensory perceptions of light lamb meat, while beliefs, behavior and quality cues were influenced by involvement

Plant-derived extracts feed-addition and packaging type influence consumer sensory perception of pork

This paper investigates whether the combination of the addition of extracts derived from plants (plants derived extracts, PDE) to pork feedstuff and the meat conservation conditions (packaging and time exposure) affect consumers’ perception of pork quality, studied by means of visual appraisal, purchase intention and a home test. The three PDE groups were control, garlic extract and blended oil composed by carvacrol, timol, cynamic aldehide and eugenol extracts. Meat was packed in film, vacuum or modified atmosphere (MAP) packaging. A visual test was designed comprising a four-day storage step followed by a four-day exposure step in a refrigerated island display case. All studied effects influenced visual appraisal scores, being time exposure and packaging effects more noticeable than PDE or pig-sex effects. Meat from MAP scored higher than the rest. Scores decreased as exposure time increased, but this evolution was less perceptible in vacuum packaging and was faster for meat from the garlic group. Only gender affected the visual appraisal scores, with women scoring higher than men. Neither PDE addition nor pig sex affected to purchase intention whereas both exposure time and packaging type did. A maximum of 2 days of exposure would be recommended. In the home-test, meat from male pigs obtained higher scores than meat from female pigs, and none of the consumer-related effects influenced the given scores

Photon-mediated qubit interactions in one-dimensional discrete and continuous models

In this work we study numerically and analytically the interaction of two qubits in a one-dimensionalwaveguide, as mediated by the photons that propagate through the guide. We develop strategies to assert the Markovianity of the problem, the effective qubit-qubit interactions, and their individual and collective spontaneous emission. We prove the existence of collective Lamb shifts that affect the qubit-qubit interactions and the dependency of coherent and incoherent interactions on the qubit separation. We also develop the scattering theory associated with these models and prove single-photon spectroscopy does probe the renormalized resonances of the singleand multiqubit models, in sharp contrast to earlier toy models in which individual and collective Lamb shifts cancel

Web-based survey of consumer preferences for the visual appearance of meat from suckling kids

Most suckling kids are raised on farms oriented toward cheese production, and many goat farmers’ rear kids with milk replacers. The aim of the current study was to investigate the consumer preferences for the visual appearance of meat from suckling kids reared with milk replacers or natural milk. Meat colour was the major criterion used to select meat. The meat of Cabra del Guadarrama reared with milk replacers was preferred by 72% of consumers and had a preferred lightness and hue angle. The rearing system did not influence preference through the time of display. Web-based surveys provided similar information to information recorded with live surveys using actual products instead of pictures. Meat colour appears to be a recurring intrinsic cue to assess consumer preference. In general, consumers preferred meat of light suckling kids reared on milk replacers because this meat had a high lightness and hue angle as well as a low chroma

Characterization of meat quality in suckling kids

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Instalación solar térmica en edificio residencial

El objeto de este proyecto es realizar una instalación solar térmica para el calentamiento de agua caliente sanitaria en un edificio residencial localizado en la ciudad de Algeciras

Efecto de la inmunocastración de terneros a dos pesos vivos sobre los parámetros productivos y la calidad de la carne

La castración física de terneros modifica la calidad de la canal, de la carne y elimina comportamientos agresivos. Sin embargo, produce dolor y paradas en el crecimiento de los mismos de los animales. La inmunocastración con vacunas anti-GnRH puede ser una alternativa. En este trabajo se ha estudiado la influencia de la inmunocastración sobre los parámetros productivos, desarrollo de los caracteres sexuales, el comportamiento y la calidad de la carne de terneros de la raza Serrana de Teruel, y si el efecto de la inmunocastración está influido por el peso vivo de los terneros en el momento de la vacunación. La inmunocastración disminuyó la ganancia media diaria y la eficiencia de conversión, independientemente de que se vacunara a los 180 o 330 kg de peso vivo, lo que implica un incremento en los costes de alimentación en el cebo. Además, los terneros inmunocastrados tuvieron canales más ligeras y ligeramente peor conformadas. Los testículos de los terneros inmunocastrados, también independientemente del peso al que se aplicó la vacuna, detuvieron su crecimiento quedando debajo de los estándares que indican que un ternero es apto para la reproducción. La concentración espermática y la motilidad espermática disminuyeron a niveles que garantizan la infertilidad, aunque se puso en evidencia la necesidad de la inmunocastración a pesos ligeros. Esta práctica facilitaría el manejo de rebaños, ya que, entre otras ventajas se pueden mezclar machos y hembras sin que se produzcan gestaciones indeseadas. El uso de la inmunocastración en terneros estuvo asociado al detrimento de algunos parámetros productivos, pero también contribuyó a la mejora en la calidad de la carne. Concretamente, contribuyó a un mayor veteado y a una menor dureza, así como a una mayor velocidad de maduración de la carne. Este hecho disminuiría los costes de almacenamiento refrigerado, al reducir el tiempo de maduración óptimo en una semana.Publishe