1,721,043 research outputs found
Risultati preliminari sulla costituzione di nuove linee triploidi e ginogenati partenogenetici in Oncorhynchus Mykiss Walb. (Trota iridea)
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Effetto dell'ordine di lattazione sulla produzione e la qualità del latte in capre Saanen
No full textThree groups of Saanen goats of different parity have been controlled about
milk production and mean qualitative parameters. Milk production and SCC content increased
according to proceed of parity (p <0.05). The nutritional characteristics resulted better in the
primiparous than in the others groups, in fact primiparous produced higher value of protein in
milk.. The technological parameters resulted similar in the three groups, characterised by a good
rennet clotting time, but with a low capacity of curdling hard
Sorghum used to fodder production in dry farming
No full textIn Italy water deficient increase forward to cultivate resistant crops for forage production. In the
present research it has been studied the opportunity of using 2 varieties of sorghum: the “Sweet Creek”, used as
green forage and for silage and the “True”, with thinner stalks, used as hay. The fodder production and the dhurrin
content during the vegetative phase of the 2 varieties were recorded. Production and chemical characteristics
of green and preserved fodders (hay and silage) were determined; moreover the nutritive value and the in vitro
digestibility of DM were measured. Results confirm the good adaptation of the sorghum to the water limited conditions
as those ones in which the test has been carried out; green and preserved fodders yield were high, however
during the hay harvest problems due to the different drying dynamics of leaves and stalks were found. The dhurrin
content of these two varieties, even in the young phase, allows the use for grazing of the regrown, which have
good bunching
Evaluation of quantitative and qualitative characteristics of spontaneous and seeded pastures
No full textMilk sheep quality variations during lactation in grazing and confined reared ewes
No full textThe present study aims to investigate the effects of different sheep rearing techniques on the milk qualitative variation. The trial involved 2 groups of 10 ewes, half of them primiparous, reared by two different techniques: (i) grazing system group with concentrate integration 0.6 kg/kg of milk; and (ii) confined rearing group with hay ad libitum and the same quantity of concentrates. Milk yield and quality have been controlled monthly by collecting individual milk samples, which have been analysed in their physical, chemical and technological characteristics. The confined ewes produced a higher milk quantity during the whole lactation period (163 days). Chemical milk characteristics resulted better in the grazing group, because of the higher values of fat, protein and casein percentage, while the milk of confined ewes was more acid. The higher acidity values for milk of the confined group determined a better rennet clotting time r, while the grazing group produced a harder curd firmness a30, 30 min after rennet addition. The outlines of qualitative parameters during lactation were similar in the two groups: the chemical characteristics improved during lactation, while the curdling aptitude was better in the intermediate period. = Cette recherche étudie les effets de différentes techniques d'élevage sur les variations qualitatives du lait ovin pendant la lactation. Pour l'expérimentation on a utilisé deux groupes de dix brebis, dont la moitié primipares : (i) le premier groupe a été élevé au pâturage avec incorporation d'aliments concentrés (0,6 kg/kg de lait) ; et (ii) le deuxième groupe a été élevé dans la bergerie avec du foin ad libitum et avec la même quantité d'aliments concentrés. Tous les mois on a contrôlé les productions individuelles de lait et on a prélevé des échantillons pour les analyses chimiques et technologiques. Les brebis élevées dans la bergerie ont produit une plus grande quantité de lait pendant toute la lactation (163 jours). Les caractéristiques chimiques du lait se sont révélées meilleures dans le groupe élevé au pâturage car il y avait une plus grande quantité de lipides, de protéines et de caséine ; alors que le lait des brebis élevées dans la bergerie résultait plus acide. Cette plus grande acidité a déterminé une meilleure réactivité à la présure (r) alors que le lait des brebis élevées au pâturage a produit un caillé plus consistant (a30). Le profil des paramètres qualitatifs du lait pendant la lactation résultait semblable dans les deux groupes : les caractéristiques chimiques du lait s'améliorent progressivement alors que les paramètres technologiques se sont révélés meilleurs pendant la période centrale de la lactatio
Acidic composition of gilthead seabream fillets (Sparus aurata L.) fed with different lipid sources: preliminary evaluation
No full textComposizione acidica dei filetti di orate (Sparus aurata L.) alimentate con differenti
fonti lipidiche: valutazioni preliminari – 360 orate del peso vivo medio di 30,7 g, sono state suddivise in
6 gruppi ed alimentate per 8 settimane con razioni diverse per contenuto e qualità dei lipidi. Gli alimenti
somministrati sono stati caratterizzati per la composizione chimica ed il profilo acidico dei lipidi totali.
A fine prova, su 10 orate per gruppo, sono state determinate la composizione chimica e acidica dei filetti.
I primi risultati mostrano una scarsa influenza della fonte lipidica sulla composizione acidica dei filetti
di orata e alcuni valori mostrano differenze statisticamente significative
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