1,721,049 research outputs found
Environmental sustainability of poultry meat production
No full textThe main effects of planet human growth, urbanization and change in eating habits are discussed. Undernutrition and malnutrition are still high in many developing countries and food of animal origin can increase the nutritive value of human diet. The increasing demand worldwide for food of animal origin, particularly in developing countries, is a challenge for agriculture and the livestock sector, already facing criticism in terms of environmental sustainability. Meat production is considered by the public opinion as one of the most responsible human activities for climate change, water contamination, acidification of the eco-systems, loss of biodiversity, etc. However, monogastrics and particularly poultry can be very efficient and sustainable, supplying high quality food which can supplement food of plant origin in a balanced human diet
Effetto della tecnica del cambio gabbia sulle performance di coniglie sottoposte ad un ritmo riproduttivo estensivo
No full textApparato 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
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
Effects of dietary starch concentration on the performance of lactating primiparous rabbit does
No full textEffetto della concentrazione di amido nella dieta sulle performance di coniglie primipare in lattazione. Al fine di rilevare gli effetti di diverse concentrazioni di amido sulle performance produttive di coniglie al primo parto, sono state formulate due diete a basso tenore di amido (una di controllo ed una a base di pastazzo d’agrumi) e due con alto livello di amido (da farina di mais o da mais fioccato). I rilievi effettuati sulle fattrici in lattazione e sulle nidiate non hanno evidenziato differenze statisticamente significative tra i gruppi. Solamente il peso delle nidiate allo svezzamento è stato influenzato negativamente dalle diete ad alto tenore in amido, in modo statisticamente significativo nel caso della dieta a base di mais fioccato. Tuttavia le alte concentrazione di amido non hanno determinato alcun aumento della mortalità dei piccoli allo svezzamento
Studio della doppia lattazione nel coniglio : effetto sulla produzione di latte, sull’ingestione e sulle performance della nidiata
No full textDouble lactation in rabbits: effect on milk production, feed intake and performance of litters. Does double lactation influence growth performance of litters? To answer this question, 42 multiparous rabbit does and their offspring were allocated to 3 groups, characterized by different frequency of lactation: free (group L), once a day (group S), double lactation (group D). The total milk production of group L (similar to that of group D) was higher (P<0,05) than that of group S (5,71 vs. 5,33 kg). The solid feed intake, from day 28 day onward, was higher (P<0,01) for D than L litters (41,2 vs. 33,6 g/d). At weaning, the weight of litters D and S was lower than that of group L (5150, 5042 and 5559 g, for D, S and L, respectively). Mortality rate did not differ between groups throughout the experimental period. These data, together with the scarce willingness of does to get into the nest box for the second lactation, suggest that the double lactation method could be useful only using hybrid characterized by high milk production. The better performance obtained with the free lactation confirm that the duration of controlled nursing could be carry out for a restricted period to prevent decrease of litter growth
Nutritive value of linseed oil in poultry diets
No full textAl fine di determinare il valore nutritivo dell’olio di lino, è stata condotta una prova di digeribilità su 32 galli adulti. Agli animali, divisi in quattro gruppi, sono state somministrate una dieta di controllo e tre diete con tre diverse concentrazioni di olio di lino (3, 6, 9%), razionando gli animali in modo da assicurare analoga assunzione di energia metabolizzabile. I risultati ottenuti indicano un peggioramento di circa il 15% del valore nutritivo dell’olio (espresso in MJ/kg SS di Energia Metabolizzabile Apparente) passando dal livello di inclusione del 3% a quello del 9% (47,8 vs 40,7, P<0,05)
Valutazioni preliminari di una miscela di Lactobacillus acidofilus e Lactobacillus plantarum sulle performance della gallina ovaiola e sulla qualità dell'uovo
No full textLactobacilli are commonly used as probiotics in poultry production for their beneficial effect on the host through maintenance of the gut microbiota balance. The aim of this study was to evaluate the effect of a mixture of L.acidophilus and L. plantarum administered with drinking water on egg quality and layer performance. The trial, performed on two different farms, was conducted on 480 laying hens which were housed in pens. The animals, from 21 to 44 weeks of age were divided into two groups: the hens of the Treatment group (T) received water with the supplementation of 100000000 CFU/animal/day of the experimental mixture, while animals of the other group received water without any supplementation (Control =C). Number and weight of eggs were recorded daily, while feed consumption and body weights of the animals were registered every week and monthly, respectively. At 25, 30, 35, 40 and 44 weeks of age, specific gravity of eggs, albumen quality (Haugh Units) and shell thickness were measured on 30 eggs/group. During the experimental period, body weight, daily feed intake and feed conversion rate of the animals were not significantly affected by the supplementation of the microbial feed additive. Moreover, no significant difference was observed in egg production and egg mass of hens between the two groups. Egg quality, instead, was influenced by the experimental treatment; in particular, specific gravity and Haugh Units of eggs in the T group were significantly higher in comparison to the C group. In conclusion, the supplementation of this mixture in drinking water did not influence growth performance of hens, but seemed to improve some characteristic of egg quality
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