1,720,962 research outputs found
An insight about roll damping within the second generation intact stability criteria
No full textDespite the recognized complexity to estimate the damping influence on ship roll motion, some efficient semi-empirical methodologies have been developed along the years to this purpose. CFD methods, in principle the most appropriate tools to predict roll damping, are not a favorite option in preliminary design at present due to their implications in terms of complexity and computational time. In this paper, an integration of the semi-empirical Ikeda’s simplified method has been formulated with modification of the bilge keels and lift components, following a contribution found in the literature and relevant for Ro–Ro ships. Moreover, with focus on damping evaluation, the second generation intact stability criteria (SGISc) have been investigated: the second-level vulnerability criteria for dead ship condition and parametric roll have been applied to a Ro–Ro passenger ship. Both the consolidated and the new proposed roll damping prediction methods have been implemented in order to appreciate their effects on the final outcome
Rearing improvement in organic Maremmana beef production: “in vivo” performance and carcass characteristics
No full text
Effect of substitution of barley and tickbean to maize and extruded soybean in the diet on milk and cheese from ewes grazing under two different stocking rates
No full textThis experiment aimed to investigate the effects of a concentrate supplement based on barley and
tickbean (BT), compared with a concentrate of maize and extruded soybean meal (MS), on milk and cheese
yield and composition of ewes grazing with different stocking rates (SR). Thirty two Comisana ewes, divided into
four groups, for 50 days in spring were allowed to graze plots of a mixed sward of Italian ryegrass and berseem
clover with a low (LSR, 23 ewes/ha) or a high SR (HSR, 38 ewes/ha) and fed BT or MS. Herbage allowance per
ewe was more than double at LSR compared to HSR (P < 0.001), and daily milk yield was 10 to 15% higher (P
< 0.01) in the LSR-BT ewes than in the other groups. Milk composition, cheese yield and composition were not
influenced by treatments. Curd firming time (k20) was higher (P < 0.05) for LSR-BT milk. Milk fatty acid
composition of ewes fed MS, compared to BT, had a higher level of C18:0 and a lower level of C16:0 and C18:3
n-3. Milk trans-10 C18:1 and trans-13 C18:1 fatty acids were higher (P < 0.05) at HSR and with BT, while trans-
12 C18:1 was higher at LSR (P < 0.05). LSR increased (P < 0.05) the cheese content of odd and branched
chain fatty acids compared to HSR. The results suggest that both concentrate type and pasture availability
influenced milk and cheese composition, whereas milk yield was positively affected by the interaction LSR × BT
Whole extruded linseed in the diet of dairy ewes during early lactation: effect on the fatty acid composition of milk and cheese
No full textEffect of substitution of barley and tickbean to maize and extruded soybean in the diet on milk and cheese from ewes grazing under two different stocking rates.
No full textThis experiment aimed to verify the effects of a concentrate supplement based on barley and tickbean (BT), compared with a concentrate of maize and extruded soybean meal (MS), on milk and cheese yield and composition of ewes grazing with different stocking rate (SR). Thirty two Comisana ewes, divided into four groups, for 50 days in spring were allowed to graze plots of a mixed sward of Italian reygrass and berseem clover with a low (LSR, 23 ewes/ha) or a high SR (HSR, 38 ewes/ha) and fed BT or MS. Herbage allowance per ewe was more than double at LSR compared to HSR (P<0.001), and daily milk yield was 10 to 15% higher (P<0.01) in the LSR-BT ewes than in the other groups. Milk composition, cheese yield and composition were not influenced by treatments. Curd firming time (k20) was higher (P<0.05) for LSR-BT milk. Milk fatty acid composition of ewes fed MS, compared to BT, had a higher level of C18:0 and a lower level of C16:0 and C18:3 n-3. Milk trans-10 C18:1 and trans-13 C18:1 fatty acids were higher (P<0.05) at HSR and with BT, while trans-12 C18:1 was higher at LSR (P<0.05). LSR increased (P<0.05) the cheese content of odd and branched chain fatty acids compared to HSR. The results suggest that both concentrate type and pasture availability influenced milk and cheese composition, whereas milk yield was positively affected by the interaction LSR*BT
Effect of soybean oil supplementation on milk fatty acid composition from Saanen goats fed diets with different forage: concentrate rations
No full textTwelve lactating Saanen goats were randomly assigned to four experimental diets, which differed in terms of forage:concentrate ratio and soybean oil supplementation. A 4×4 Latin square design was used. On a dry matter (DM) basis, forage:concentrate ratios were 63:37 (‘high-forage’ diet) and 35:65 (‘low-forage’ diet/high beet pulp). These diets were given either with oil (100 g·d-1) or without. The inclusion of soybean oil in the diet resulted in a significant increase in milk yield (but with HF diet) and in milk fat yield and concentration (P<0.05). Milk protein content remained unchanged across the diets. Milk protein yield was, however, higher for the high-forage diet containing added oil (forage × oil interaction, P<0.05). Soybean oil in the diet modified the milk fatty acid composition, reducing the levels of medium-chain and saturated fatty acids and increasing the levels of C18:2 n-6 and conjugated linoleic acid (CLA). The addition of soy- bean oil to the diet resulted in a significant increase in rumenic acid (cis-9, trans-11 CLA) and vaccenic acid (trans-11 C18:1) content in the milk fat. Interactions between forage and oil resulted in a significant increase in rumenic acid and vaccenic acid in animals fed a high-forage plus oil diet, and in trans-10 C18:1 and trans-10, cis-12 CLA in animals fed a low-forage plus oil diet, probably due to a shift in the rumen’s biohydrogenation of linoleic acid
Temporal changes of conjugated linoleic acid in milk from Sarda ewes with different milk fat secretion ability
Full text linkIndividual milk samples were weekly collected from 48 ewes during eight weeks. Ewes
were at the second month of lactation and they were fed the same dietary regimen. The animals were
grouped according to the amount of daily milk fat yield: A) 38-57g/d, B) 58-63g/d, C) 64-73g/d, D) 75-110g/d.
Milk from group D showed a higher content of FA from C4 to C10 and a lower content of monounsaturated
FA (MUFA) and conjugated linoleic acids (CLA) than Group A (+12%, -11%, and -18%, for C4 to C10, MUFA
and CLA, respectively), while Group B and C showed intermediate values. CLA content increased with days
of lactation in a similar way for all groups. The mean correlation among all records within each individual
lactation was 0.45 for CLA content. Six milk FA pair ratios representing a proxy for SCD activity were also
evaluated: group A showed higher values of FA ratios than Group D (+26% on average for all FA pairs). In
conclusion, increasing ability of daily milk fat yield was associated with lower milk content of MUFA and
CLA and higher content of FA from C4 to C10
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
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