Effetti della specie foraggera e della tecnica di pascolamento sulla produzione di latte ovino.

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[automatically translated] The research objective was to evaluate the effects of grazing on different botanical species, using both continuous system that what turnato, on sheep milk production. Forage resources used were represented by the (Hedysarum coronarium L.), a herbarium of intercropped Egyptian clover (Trifolium alexandrinum) and oats (Avena sativa) and chicory a lawn (Cichorium intybus). They have been used 40 lactating sheep divided into 5 homogeneous groups, each assigned to one of three treatments: continuous grazing on sulleto; grazing turnato of sulleto; Continuous grazing of intercropping; grazing turnato of intercropping; continuous grazing of chicory. With regard to areas grazed continuously, the availability of biomass was lower for chicory than the intercropping and the on (respectively 1242, 1911 and 2532 kg DM / ha) and overall it was detected a greater milk production in animals grazing chicory than the intercropping (respectively 1243 vs. 1003 g / d; P≤0.01), while intermediate values are obtained with the (1136 g / d). The quality of milk, in terms of percentage content in fat, protein and casein, has undergone an obvious dilution effect that caused the reduction with increasing amount of milk produced. During the test, there was a gradual reduction of milk production, due to the deterioration quantity and quality of grazing resources; this decrease in milk production was more contained however with chicory than the other grazed species. In the comparison between the grazing techniques, the turnata utilization led to a higher production of forage compared to continuous, and the sheep to continuous grazing produced a greater amount of milk (1 070 vs 951 g / d; P0,05) , regardless of the species grazed. The effect of the period greatly influenced the production of milk; in the first period of greater availability of quantitative and qualitative grass, the sheep have produced more milk than the second period. Furthermore, in this first phase, the sheep that grazed on the showed a higher milk production than the intercropping (1377 vs 1159 g / d, P ≤ 0.05), while that gap has emerged in the second period. Because of the dilution, the sheep that grazed on the produced less milk fat than those that grazed sull'erbaio. For both comparisons Adjustment parameters of aptitude for clotting bulk milk, as well as the live weight and BCS detected at the beginning and end of the test, did not differ between the experimental groups. Ultimately, the findings did confirm the remarkable productivity of on and its positive effect on the sheep milk production that use grazing. It was shown, furthermore, the remarkable potential of chicory, excellent forage able to ensure over time a good grass quality and to increase the productive performance of dairy sheep. Moreover, the results obtained confirm that the grazing,
Original languageItalian
Title of host publicationSostenibilità per le produzioni zootecniche nelle regioni meridionali
Number of pages17
Publication statusPublished - 2011

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