1,721,031 research outputs found
Caratteristiche degli allevamenti agricoli in due province toscane: consistenza ed organizzazione.Nota I.
No full textL'anatra muschiata: riproduzione e condizioni di allevamento.
No full textL'effetto di alcuni parametri climatici è stato valutato nell'Anatra muschiata nel corso di vari cicli riproduttivi. La temperatura dimostra di svolgere un effetto negativo sul peso dell'uovo
Caratteristiche degli allevamenti avicoli in due province toscane: Le strutture. Nota II
No full textPerformance produttive di maschi di maschi di anatra comune e muschiata in rapporto alla diversa tecnologia di allevamento.
No full textThe authors evaluated the performance of Muscovy duck (MD) and Common duck (CD) drakes reared under different techniques. A total of 356 birds (178 MD) and 178 CD) were used for the trial. All birds were reared from the first day of life to 28 days inside a windowless poultry house then one half MD and CD were transferred to open air pens (similarly to the France rearing system which assigns the Label Rouge). Results showed that the system which imposed the open air rearing system did not determine a reduction of growth speed in MD and in CD. Open air rearing system induced an increase of feed consumption in both species without significant differences in feed conversion
Tenore di fibra nell'alimento in rapporto all'accrescimento e all'indice di conversione nell'anatra muta
No full textThe aauthors studied the effect of feed fiber content on Muscovy ducling performance. A total of 360 ducklings were fed ad libitum with three mashes containing different fiber percentages: 4, 5 and 6%. The results showed that the increase of diet fiber content induces a worsenoing of weight gain (regression coefficient between feed.fiber content and live weight at slaughtering age: 60-70 grams) but not of the feed conversions efficiency (regression coefficient between feed-fiber content and FCE ar slaughtering age=+0.04 for males and +0.03 for females
A Novel Simplified Protocol for Pre-Processing Whole Wood Samples for Stable Isotope Analysis in Tree Rings
No full textIn the context of climate change, the stable isotope analysis of tree rings may play a crucial role in deciphering the eco-physiological mechanisms underlying forest decline and dieback phenomena. However, this technique is often considered expensive, time-consuming, and with several methodological constraints. Specifically, milling and transferring the material from jars to vials during the different steps of sample preparation involve risk of contamination among samples and loss of sample material. When dealing with declining trees (i.e., trees affected by loss of vitality with strong percentage of defoliation and reduction in growth) and trees subjected to extreme events or negative pointer years (characterized by extremely narrow ring) the sample preparation is particularly difficult because of scarce amount of wood material. In such a case, pooling rings from several years to achieve the minimum weight of wood is often necessary, thus losing information at the annual resolution. In order to overcome such limitations, we developed a novel protocol for quick and accurate whole-wood pre-processing, testing it on oak tree rings of different widths taken from living trees. The main novelty introduced by our protocol was freezing tree-ring samples at −80 °C and milling multiple samples at a time by using a 24-tube plate. The results showed that our novel simplified protocol significantly reduced the pre-processing time with respect to the standard protocol (12 vs. 284 sec/sample), while achieving the same wood particle size, limiting the loss of wood material and reducing the risk of contamination among samples
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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