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Il ruolo della conoscenza nella percezione del consumatore del pesce alimentato a base di insetti
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Il ruolo della conoscenza nella percezione del consumatore del pesce alimentato a base di insetti
Full text linkVariation of amino acids in Prunus persica cultivars leaves with regard to leaf age
Full text linkThe central role of amino acids in cellular and plant physiology is of current interest. Information related to the implication of amino acids during leaf age is still scarce. This study examined changes in the profile of amino acids extracted from leaves of five peach cultivars (‘Early Maycrest’, ‘Sweet Cap’, ‘O'Henry’, ‘Flordastar’, and ‘Rubirich’) grown in the region of Sidi Bouzid, central-western Tunisia with respect to leaf age. Seventeen amino acids, aspartic acid (Asp), serine (Ser), glycine (Gly), proline (Pro), tyrosine (Tyr), valine (Val), methionine (Met), cysteine (Cys), tryptophan (Trp), leucine (Leu), phenylalanine (Phe), isoleucine (Ile), lysine (Lys), glutamic acid (Glu), arginine (Arg), alanine (Ala), and histidine (His) were quantified. Significant variations were observed for Asp, Glu, Ser, Gly, Ala + Arg, Pro, Val, Ile + Trp, and Lys in relation to the leaf age. On average, young leaves (106.48–142.18 mg g−1 DW) contained higher amounts of most amino acids than mature leaves (97.33–110.27 mg g−1 DW). Approximately identical contents of amino acids were found in the different cultivars. In conclusion, P. persica leaves are a very rich source of amino acids (about 10% DW), and therefore deserves further investigation for their potential application in the nutraceutical, food, feed, and pharmaceutical industries
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Comparison between "Chemlali" and "Chétoui" olive oil quality according to different growing areas
No full textDifferent uses of Hermetia illucens in the post-weaning piglets
No full textPigs are one of the subsectors of the livestock industry that are expanding the quickest. Because pig feed makes up 23% of the world’s output, it is important to think about how switching to more sustainable feed components might increase the sustainability of the pig industry as a whole. Compared to conventional protein sources, insects are a more ecologically friendly feed element. The larvae of Black soldier fly larvae (BSFL, Hermetia illucens) are an excellent candidate for protein and lipid sources. This study aims to assess the growth parameters and behavior of piglets receiving larvae meal (LM) in the diet and/ or live larvae (LL) in addition to environmental enrichment. A total of 96 piglets, 28 days of age, were individually weighed and allocated to different treatments and were kept in small collective pens (6 piglets each). The trial lasted 39 days and there were 4 experimental groups, each comprising 4 replications: a control group (C), a control group with live larvae (CLL), a group was given larvae meal (LM), the last group was given both live larvae and larvae meal (LMLL). BSF larval meal was included at 6%, while the live larvae were administered separately at increasing levels during the trial up to a maximum of 600 gr/pens (100 gr/piglets). The piglets at the end of the experiment were individually weighed, the average daily gain (ADG) was computed, and the feed conversion ratio (FCR) was calculated using the feed intake. Video recordings were done to get data on the behavioral research. The quantity and duration of the events will be analyzed when the video data has been processed. Preliminary results from this research show that the administration of larval meal, as well as live larvae to piglets in the post-weaning, does not have significant effects (P>0.05) on growth performance (live weight, average daily gain, feed conversion ratio). Although growth performance was not affected by the addition of live larvae, the piglets showed great interest in this feed. Video recording analysis will allow us to evaluate the use of live larvae in terms of behavior and well-being
Black soldier fly defatted meal as a dietary protein source for broiler chickens: effects on carcass traits, breast meat quality and safety
Full text linkIn the perspective of improving the sustainability of meat production, insects have been rapidly emerging as innovative feed ingredient for some livestock species, including poultry. However, at present, there is still limited knowledge regarding the quality and sensory traits of the derived meat. Therefore, the present study tested the effect of a partial substitution of soya bean meal and oil with defatted black soldier fly (Hermetia illucens) larvae meal (H) in the diet for growing broiler quails (Coturnix coturnix japonica) on meat proximate composition, cholesterol, amino acid and mineral contents, fatty acid profile, oxidative status and sensory characteristics. To this purpose, three dietary treatments were designed: a control diet (C) and two diets (H1 and H2) corresponding to 10% and 15% H inclusion levels, respectively, were fed to growing quails from 10 to 28 days of age. At 28 days of age, quails were slaughtered and breast meat was used for meat quality evaluations. Meat proximate composition, cholesterol content and oxidative status remained unaffected by H supplementation as well as its sensory characteristics and off-flavours perception. Differently, with increasing the dietary H inclusion, the total saturated fatty acid and total monounsaturated fatty acid proportions raised to the detriment of the polyunsaturated fatty acid fraction thus lowering the healthiness of the breast meat. The H2 diet increased the contents of aspartic acid, glutamic acid, alanine, serine, tyrosine and threonine thus further enhancing the biological value of the meat protein. As a direct result of the dietary content of Ca and P, the meat of quails fed with the highest H level, displayed the highest Ca and the lowest P values. Therefore, meat quality evaluations confirmed H to be a promising insect protein source for quails. The only potential drawback from feeding H to broiler quails regarded the fatty acid profile of the meat, therefore requiring further research efforts to understand to what extent the fatty acid profile of H can be improved
Growth Performance, Digestive Efficiency, and Meat Quality of Two Commercial Crossbred Rabbits Fed Diets Differing in Energy and Protein Levels
Full text linkThe present study evaluated the effect of digestible energy (DE) and crude protein (CP) levels on growth, digestive efficiency, slaughter yield and meat quality in growing rabbits of two genotypes (Grimaud, G vs. Hyla, H). A total of 384 crossbred rabbits (192 G and 192 H), half males and half females, were divided into eight experimental groups according to a bi-factorial arrangement (2 genotypes x 4 diets; 48 animals/group) and reared in individual cages. From 33 to 64 days of age, rabbits were fed four diets obtained by combining two DE levels (high, HE—10.9 MJ/kg vs. low, LE—9.2 MJ/kg, on average) and two CP levels (high, HP—159 g/kg vs. low, LP—144 g/kg, on average). Then, all rabbits received the same fattening diet (10.7 MJ DE/kg; 156 g CP/kg) until slaughtering (77 days of age). Growth performance did not differ between genotypes for the entire trial (on average final live weight 3010 g; dailyweight gain 50.5 g/d), butHrabbits showed a faster growth during the post-weaning period (p < 0.01) compared to G rabbits, while exhibiting lower slaughter yield and lower carcass fatness (p < 0.01). As DE level increased, feed intake decreased and feed conversion improved (p < 0.001), while caecal volatile fatty acid concentration increased and caecal pH and N-ammonia decreased (p < 0.01). The reduction in the CP level did not affect performance and carcass traits. No significant interaction was detected between genotype and diet. In conclusion, G rabbits may have an advantage over H rabbits because of the higher slaughter yield. As for the nutritional characteristics of diets for high-producing crossbred rabbits, high energy levels are confirmed to enhance feed efficiency, whereas dietary CP can be reduced to 144 g/kg without negative effects on performance and carcass traits
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