1,720,959 research outputs found
Apparato digerente
No full textThe book “Avicoltura e Coniglicoltura” aims to explain the poultry and rabbit science underlying the productive processes of growth and reproduction and the nutrition and the breeding techniques. It represents a suitable Italian text dedicated to students and people of the poultry industry.
The chapter “Digestive system”, in particular, describes the digestive system of the bird and analyses physical and chemical-enzymatic processes to understand the nutritive requirements of poultry
Traditional cages for layers vs. enriched cages or slat floor
No full textIn 15 layers farms, ten with traditional cages (690737), four with enriched cages (688929 hens) and one with slat floor (14498 hens), egg production, number of weight of eggs, FCR and mortality were registered during a whole production cycle (from 18 to 56 wk of age). Hybrid line, origin of pullets, enviromental and hygienic conditions, light programs, and diet were the same in all farms. On the average, the comparison between traditional and enriched cages shows that there were not significant differences on productive performance with number and weight of eggs, feed intake, and feed conversion ratio. The mortality was significantly lower in hens housed in enriched cages in comparison to those reared in traditional cages, showing a higer level of welfare in animals housed in enriched cages. Preliminary results registered on laying hens housed on slat floor seem to reduce productive performace, even if the lower number of defective eggs could be a positive aspect of this housing system
Effect of intake level and diet composition on digestibility in nulliparous pregnant rabbit does
No full textEffetto del livello di ingestione e della composizione della dieta sulla digeribilità dei principi alimentari e dell’energia nella coniglia nullipara in gravidanza. Scopo del presente lavoro è stato quello di
valutare l’effetto di due differenti diete (EC1: 11,7 vs. EC2: 11,2 MJ ED/kg SS), somministrate in due livelli alimentari, sulla digeribilità nell’ultimo periodo della gravidanza della coniglia nullipara. La prova è stata effettuata su 32 coniglie ibride dal 20° al 24° giorno di gravidanza. I coefficienti di utilizzazione digestiva determinati sono risultati inferiori rispetto a quelli riportati in letteratura per coniglie non gravide. La dieta EC1 ha fatto registrare una maggior digeribilità, mentre l’effetto del livello alimentare, ad eccezione della proteina, non è mai risultato significativo. Il bilancio dell’azoto non è mai stato significativamente influenzato, né dalla dieta né dal livello alimentare, a causa della maggior escrezione urinaria negli animali alimentati con la dieta EC2. La riduzione dell’ingestione di alimento e la minor digeribilità suggeriscono la somministrazione di diete ad elevata concentrazione energetica già a partire dagli ultimi giorni di gravidanza.The aim of this study was to evaluate the effect of two different diets (EC1: 11.7 vs. EC2: 11.2 MJ DE/kg DM), administered ad libitum (AL) or restricted (R, 35 g*BW0.75) on digestibility of nulliparous rabbit does during the last period of pregnancy. In particular, the trial was carried out on thirty-two hybrid nulliparous rabbit does of from the 20th to the 24th day of pregnancy. Digestibility values found in our experiment are low if compared with those reported in literature for non pregnant or lactating females, but consistent with those determined in pregnant rabbit does during the final 10 days of pregnancy. Digestibilities of nitrogen, carbon and energy differed significantly between diets, with the highest values for the does fed diet EC1, while the effect of intake level was never significant with the exception for nitrogen. Nitrogen balance was not affected by the diets and the intake level for the higher urinary nitrogen loss of diet EC2 could be due to the utilization of protein as energy source.
The low feed intake and the decrease of the digestibility recorded in our trial suggest to feed nulliparous rabbit does with high energy diets already from the last days of pregnancy
Effect of lycopene supplementation on semen quality and reproductive performance in rabbit
Full text link[EN] A total of 18 hybrid strain Martini male rabbits were randomly divided into three experimental groups. The animals in the first and second groups drank water with 0.1 and 0.5 g/l of lycopene addition (B and C groups, respectively), while water without any supplement was administered to the control group rabbits (A group) for 8 weeks. Semen was collected from 18 bucks (6 animals/group) for 5 consecutive weeks. Ejaculate volume was determined by graduated test tube and sperm concentration was calculated by Neubauer chamber. Sperm motility was evaluated subjectively by a phase contrast microscope and forward progressive motility (FPM) scored 1¿4 (low-high). Sperm viability was assessed by nigrosin/eosin (N/E) staining procedure. At the end of the semen evaluation period, 20 females per group were inseminated on day 11 post partum with a pool of semen collected from each experimental group. Data showed that the highest level of lycopene (C group) resulted in a significantly greater volume of ejaculate and total number of sperm than in the control group (0.98 vs. 0.78 ml and 364 vs. 227, P0.05). This study shows the positive effects of lycopene supplementation on semen production and refrigerated semen characteristics. Lycopene supplementation of drinking water could have interesting applications in field conditions, although further research into the role of this antioxidant in animal production is needed.Mangiagalli, M.; Cesari, V.; Cerolini, S.; Luzi, F.; Toschi, I. (2012). Effect of lycopene supplementation on semen quality and reproductive performance in rabbit. World Rabbit Science. 20(3):141-148. https://doi.org/10.4995/wrs.2012.1150SWORD14114820
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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