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Search Results: 1 - 10 of 2024 matches for " Pietro Celi "
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The role of oxidative stress in small ruminants' health and production
Celi, Pietro;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010001300038
Abstract: this paper examines the role that oxidative stress plays in small ruminant medicine. we will examine how redox homeostasis is involved in some physiological functions and we will discuss the implications of the impairment of oxidative status on small ruminant health and production.
The influence of lactation on the quantity and quality of cashmere production
Raffaele Celi,Adriana Di Trana,Pietro Celi
Italian Journal of Animal Science , 2010, DOI: 10.4081/ijas.2002.79
Abstract: The aim of this study was to investigate the influence of lactation on cashmere production. Two groups of cashmere bearing goats, aged between 2 and 3 years, were used in this study. The control group included 12 non-lactating, non-pregnant subjects. The experimental group was made up of 12 goats that had given birth to twins or triplets and that had begun lactating in the second half of May. Lactation therefore had begun approximately 45 days prior to the beginning of the emergence of fibre on the body surface. Live weight was not affected by the physiological state under consideration. The decrease observed in January is too remote to have been an effect of lactation. One likely explanation is that after shearing the animals were obliged to use their body reserves for thermoregulation. Prolactin concentration was higher at the beginning of the study in both groups and it was not influenced by lactation. Albeit with a varied intensity, secondary follicles were found to be active during the entire trial period but activ- ity never reached 100% in either group. Lactation significantly suppressed the percentage of secondary follicle activity and this was more evident from June to September. Fibre length and diameter did not differ between the two groups, so lactation did not affect fibre dimensions. The period of growth was shorter in lactating goats (184 vs 226 d). This did not make a difference in fibre length in so much as the lactating goats manifested a higher daily aver- age growth rate (0.27 ± 0.03 vs 0.20 ± 0.03 mm/d; P lesser than 0.05) which compensated for the shorter period of growth. Lactation caused a decrease in productivity of an insignificant nature, therefore we hold that the negative effect of lactation on cashmere production does not depend upon the physiological status as such but, most probably, upon the level of productivity and the degree to which the lactation and fibre growth cycles overlap.
The influence of pregnancy and the beginning of lactation on pelage traits in cashmere goats
Raffaele Celi,Adriana Di Trana,Pietro Celi,Giuseppe Marsico
Italian Journal of Animal Science , 2010, DOI: 10.4081/ijas.2005.85
Abstract: The aim of this study was to investigate the effect of pregnancy followed by the beginning of lactation on fibre traits in cashmere goats. Two groups of cashmere-bearing goats aged between 2-3 years were used. The control group (A) included 12 non-lactating, non-pregnant subjects. The experimental group (B) included 12 goats mated during the first week of June, in order to have pregnancy and the beginning of lactation coincide with the period when cashmere normally grows. As expected, Liveweight significantly varied in Group B during the last two months of pregnancy, when foetal growth reaches its maximum, and following delivery. Hair patch weight, because of the continuous growth of primary and secondary fibres, increased significantly during the trial (P<0.001). The physiological status considered negatively affected (P<0.05) the total mean growth rate of cashmere fibres and, as a result, their length. Cashmere daily growth rate values varied significantly (P<0.05) throughout the experiment, while the effect of the physiological status was noted only in November – December. Furthermore, this parameter also seems to be influenced by climatic factors and, in particular, environmental temperature, as shown by the negative correlation (r = - 0.28; P<0.05) between cashmere daily growth rate and environmental temperature. Guard hair length and growth rate did not differ between the two groups, however, they were influenced by time. Cashmere yield and cashmere production were lower in group B (P<0.05). No differences between groups were observed for cashmere diameter. Overall, pregnancy and the consequent period of lactation negatively influenced cashmere rather than guard hair fibres. These negative effects were noted in quantitative terms as yield and production dropped by 37% and 43%, respectively. We hypothesise that the complete overlap of pregnancy and lactation with the period of cashmere growth reduced the number of secondary active follicles and their degree of activity and caused an increase in competition for the partitioning of nutrients between hair follicles and the gravid uterus, first, and then the mammary gland, later.
The Effect of Different Types of Physical Exercise on the Behavioural and Physiological Parameters of Standardbred Horses Housed in Single Stalls
Barbara Padalino,Paola Zaccagnino,Pietro Celi
Veterinary Medicine International , 2014, DOI: 10.1155/2014/875051
Abstract: The aim of this study was to investigate the impacts of three different physical exercises on the physiological and behavioural patterns of Standardbred trotters housed in single stalls. Twelve racing mares were observed twice during each different exercise: daily training (DT) consisted of forty minutes at slow trot (4-5?m/s) in a small track; maximal exercise (ME) consisted of 1600?m run at maximal velocity; race (R) was a real race of 1600?m. The mares were examined at rest in their stall (Time I), soon after the completion of the exercise (Time II), one hour (Time III), and two hours (Time IV) after the exercise. Their heart rate, respiratory rate, and rectal temperature were recorded and they were videotaped in order to complete a focal animal sampling ethogram. All physiological parameters increased after exercise, in accordance with its intensity. After R and ME horses spent more time drinking, eating, and standing. The incidence of abnormal behaviours was very low and it was not affected by the different types of exercise. Overall, the assessment of horse behaviour after physical exercise by means of a focal animal sampling ethogram represents a useful tool to monitor equine welfare. 1. Introduction Although animal welfare has become more important in the equine industry, housing systems limiting natural behaviour patterns are still widespread [1]. Single stalls can confine social interaction and locomotion to a great extent, but, despite this, they are widely adopted in the equine industry, especially for Standardbred horses [2]. Housing horses in a single stall can influence equine welfare [3], with physical exercise being the only moment when horses can regularly move and express social behaviour. However, the possible consequences of prolonged confinement in stables on equine well-being have been studied [4] and group housing systems have been tested [5]. Animals can adapt to a new environment, but, when horses are kept alone on a flat, unstimulating square with nothing to do, some adaptative responses might include apathy and unresponsiveness, hyperresponsiveness, and stereotypic behaviour [6]. Apparently functionless, repetitive, stereotypic activities can be seen in stable horses [7–9] and equine stereotypies are primarily based on feeding and locomotory behaviours, due to management practices that limit foraging behaviour and social contact [10]. Although some researchers are investigating the relationships between exercise, housing and management, and the development of abnormal behaviour in horses [11], there is a lack of information
Enhancing Postgraduate Learning and Teaching: Postgraduate Summer School in Dairy Science
Pietro Celi,Gianfranco Gabai,Massimo Morgante,Luigi Gallo
Veterinary Medicine International , 2014, DOI: 10.1155/2014/409549
Abstract: Dairy science is a multidisciplinary area of scientific investigation and Ph.D. students aiming to do research in the field of animal and/or veterinary sciences must be aware of this. Ph.D. students often have vast spectra of research interests, and it is quite challenging to satisfy the expectation of all of them. The aim of this study was to establish an international Ph.D. training program based on research collaboration between the University of Sydney and the University of Padova. The core component of this program was a two-week Postgraduate Summer School in Dairy Science, which was held at the University of Padova, for Ph.D. students of both universities. Therefore, we designed a program that encompassed seminars, workshops, laboratory practical sessions, and farm visits. Participants were surveyed using a written questionnaire. Overall, participants have uniformly praised the Summer School calling it a rewarding and valuable learning experience. The Ph.D. Summer School in Dairy Science provided its participants a positive learning experience, provided them the opportunity to establish an international network, and facilitated the development of transferable skills. 1. Introduction Internationalization of higher education refers to institutional arrangements set up by governments, universities, and education agents that involve the delivery of higher education services in two or more countries. For teaching and research, effective and appropriate national and international networks are essential. In some cases, the academic enterprise will depend on an international network of collaboration, while, in other cases, it is difficult to imagine how anything much could be achieved without such a network. Academics often establish their own networks, and the best role of the institution may often be facilitation, following after good leads, and reducing bureaucratic drag and friction. Individual research collaborations between academics from different countries are important; however, formal collaborations between universities that involve curriculum and program development are growing and likely to expand in the years ahead. Such arrangements could include short-term placements in overseas laboratories, arrangements for registration for specialized Masters level courses, teaching fellowships to widen experience, and joint supervision and coqualification arrangements, such as the increasingly popular cotutelle programmes. If appropriately organized, such bilateral arrangements can foster research collaboration, as research communities build interests
Justi?a como igualdade? A percep??o da elite e do povo brasileiro
Scalon, Celi;
Sociologias , 2007, DOI: 10.1590/S1517-45222007000200007
Abstract: studies about social inequality in brazil usually focus on its objective dimensions, such as sex, colour, income, occupation, and schooling. the size of the gap between rich and poor is reasonably well known thanks to studies already carried out, but little is known about how the disparity is seen by brazilians. in 2000, as part of the international social survey programme, an attempt was made to fill this gap through a survey of members of the national elites - here understood as individuals in the richest 10% of the population. the nationwide study - 2,000 interviews in 195 towns and cities - sought to reveal different perceptions of inequality by the "elite" and the "people". the survey raised issues related to the images both groups have of brazilian society and how it is structured; the appropriate wages for differently qualified workers; the values that should govern distribution of the country's wealth; brazil's major problems; and the strategies favoured by each group to reduce poverty, with an emphasis on the role of the state. the answers showed surprising agreements and disagreements between the people and the elite. both groups recognise the scale of social inequality in the country, but they tend to advocate different strategies to reduce them, transferring solutions to inequality to the state. these similarities and differences in points of view may provide important elements for understanding the mechanisms that legitimise inequality.
Sistema em Leibniz e Descartes
Hirata, Celi;
Trans/Form/A??o , 2012, DOI: 10.1590/S0101-31732012000100003
Abstract: descartes thinks that the true scientific order is that of reasons, in which one starts from the easiest and most evident truths and moves towards those that are more difficult and complex. thus a unique, progressive, and irreversible order is established, where each member of the chain depends on those that precede it, and each thesis has a non-interchangeable place inside the doctrine. leibniz, on the contrary, defends the idea that "une même vérité peut avoir beaucoup des places selon les differents rapports qu'elle peut avoir" (nouveaux essais, iv, xxi, § 4 ; gp v, p. 506). in order to avoid repetition, assembling the greatest quantity of truths in a minimum of volumes, leibniz argues that the best scientific order is a systematic disposition in which each place refers to all the others, so that the connections among knowledge becomes clear. in opposition to the cartesian model of system, in the leibnizian model theses are based upon one another, and the order of truths is reversible. it is due to these differences concerning the conception of system that leibniz, unlike descartes, can pretend to take the best of each philosophical system in order to constitute his own, given that for him there is a certain malleability in the construction of a philosophical system.
Apercep o versus percep o: os espíritos na cosmologia leibniziana
Celi Hirata
Princípios : Revista de Filosofia , 2008,
Abstract: Leibniz states that every monad expresses the hole universe from a determined perspective. Therefore, all created beeings harmonize with each other, once that all of them represent the same world, as well each one individuates itself by means of its own point of view, which is determined by the place that its correspondent body occupies. However, if the capacity of representation is merely limited by space and time, how could one explain the capacity of spirits to grasp necessary and eternal truths and to establish science? In order to make this point clear I will introduce the aperception activity and distinguish it from the perception, that is common to all monads.
El área andina: entre la geopolítica regional y las vicisitudes nacionales
Quórum : Revista de Pensamiento Iberoamericano , 2007,
Abstract: El área andina devino en una zona de tensión en América del Sur, con el debilitamiento de la integración subregional y el riesgo de regionalización del conflicto colombiano, presionada por la militarización de las acciones estatales, bajo el influjo de la política de seguridad norteamericana. Para los países del área andina es fiindamental evitar el arraigo de una zona de status bélico, que agravaría las limitaciones de comercio e inversión, la inestabilidad política, las crisis institucionales, los conflictos sociales, las migraciones y la pobreza. Les es imperativa la reconfiguración de sus proyecciones estratégicas, en correspondencia al actual momento continental, en el que afloran nuevas tendencias en varios países sudamericanos que ven en la integración un recurso estratégico para la consolidación de procesos políticos transformadores.
Speed of Adjustment and Infraday/Intraday Volatility in the Italian Stock and Futures Markets  [PDF]
Pietro Gottardo
Modern Economy (ME) , 2011, DOI: 10.4236/me.2011.25082
Abstract: We estimate the speed of adjustment of prices to value changes in the Italian stock and futures markets using variances in different return intervals. The paper presents evidence that an assumption of linearity for the relationship volatility-time is untenable when intraday and infraday data are used jointly. Prices adjust to new information within three days, but the process is complex with evidence of overshooting and divergent movements in the smaller return intervals. Firms behave differently according to their inclusion or exclusion from the MIB30 index. The speed of adjustment is strongly related to firm-specific characteristics and the log of capitalization explains some of the cross-sectional variability in the adjustment coefficients for most of the return intervals.
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