1,721,005 research outputs found

    Le fonti di variabilità ambientale della qualità tecnologica del latte di bovine di razza frisona

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    RIASSUNTO La presente ricerca ha avuto l’obbiettivo di analizzare alcune fonti di variabilità ambientale (epoca del prelievo, stadio e ordine di lattazione) che possono incidere sui parametri lattodinamografici del latte bovino indirizzato al consumo fresco e di tipizzarlo dal punto di vista tecnologico, allo scopo di esaminare l’adeguatezza del prodotto ad un suo eventuale utilizzo nella caseificazione. A tale scopo è stato analizzato qualitativamente il latte di 137 bovine di razza Frisona appartenenti ad un allevamento della Toscana. I parametri presi in considerazione sono stati quelli chimici (estratto secco, proteine, grasso, lattosio e ceneri), tecnologici (tempo di coagulazione, tempo di rassodamento e consistenza del coagulo a 45 minuti), le cellule somatiche, la carica batterica totale, il pH e l’acidità titolabile. Inizialmente sono stati individuati quattro “tipi di latte” principali (E, EF, F e FF) in base alla rilevabilità dei tre parametri lattodinamografici r, k20 e a30 e, successivamente, il Tipo E è stato suddiviso in ulteriori 6 sottotipi. Il latte è risultato complessivamente di scarsa reattività ed è stato inoltre evidenziato che tutti i fattori di variabilità ambientale determinano differenze soprattutto nella distribuzione delle tipologie tecnologiche, ma non sui singoli parametri. Parole chiave: latte bovino, parametri lattodinamografici, variabilità, fattori ambientali. SUMMARY A trial was carried out on 137 cows of Italian Friesian, reared in one farm of the Tuscany with the aim to study the influence of some variability factors (season sample, parity and stadium of lactation) on the rheological parameters of the milk destined to fresh consumption and typifying it for the technological point of view, in order to examining the adequacy of the product to his possible utilization in the cheese making. Milk samples for qualitative analysis were taken over a time period of one year; only one sam- ple from each animal was taken from the morning milking. The following procedure were carried out on every sample of fresh milk: chemical composition (dry matter, fat, protein, lactose and ash), rheological parameters (clotting time “r”, curd firming time “k20”, curd firmness measured 30 min and 45 min after rennet addition “a30” and “a45” respectively), somatic cell count, pH and titratable acidity. Initially, on the base of the three rheological parametes (clotting time, curd firming time and curd firmness measured 30 min after rennet addition), four types of milk were identified (E, EF, F and FF) and, subsequently, the type E has been divided in further 6 subtypes. Milk resulted of scarce reactivity and it has been besides pointed out that all the factors of environmental variability determine difference mainly in the distribution of technological typologies, but not on single parameters

    Egg laying in two Grey partridge (Perdix Perdix L.) lines differing for the breeding technology artificial egg hatch or mother egg hatch

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    The artificial breeding by-pass the effect of the natural selection and, inevitably, subjected the game birds to the selection carried out by the breeding technology. For this reason we made a research to evaluate if different breeding technologies, carried out for six generations, my be enough to differentiate two Grey Partridge lines. The results confirmed the supposition that the natural brooding differentiated a new grey partridge line.The line selected by the natural breeding technoligy is characterized by lower egg production and delayed egg laying start and consequently it is more fitted for release in the wild

    Building CorefLat A linguistic resource for coreference and anaphora resolution in Latin

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    This paper presents the initial stages of a project focused on coreference and anaphora resolution in Latin texts. By building a corpus enhanced with coreference/anaphora annotation, the project wants to explore empirically a layer of metalinguistic analysis that has not been yet extensively investigated in linguistic resources and natural language processing for Latin. After reviewing the related work on this NLP task, the paper discusses annotation criteria and data analysis, providing examples about a few issues that emerged during the annotation process
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