Effects of seasonal changes in feeding management under part-time grazing on the evolution of the composition and coagulation properties of raw milk from ewes
| Autor: | Luis Javier R. Barron, F.J. Pérez-Elortondo, A.I. Nájera, M. de Renobales, Eunate Abilleira, Mailo Virto, J.C. Ruiz de Gordoa, J. Salmerón, Marta Albisu |
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| Rok vydání: | 2010 |
| Předmět: |
Forage
Biology Pasture Milking Fats Fodder Grazing Genetics Animals Dry matter Food science Animal Husbandry geography Sheep geography.geographical_feature_category Caseins food and beverages Hydrogen-Ion Concentration Raw milk Milk Proteins Animal Feed Diet Dairying Milk Spain Female Animal Science and Zoology Rennet Seasons Chymosin Food Science |
| Zdroj: | Journal of Dairy Science. 93:3902-3909 |
| ISSN: | 0022-0302 |
| DOI: | 10.3168/jds.2009-2983 |
| Popis: | Ewe raw milk composition, rennet coagulation parameters, and curd texture were monitored throughout the milk production season in 11 commercial flocks reared under a part-time grazing system. Milking season lasted from February to July. During that period, the diet of the animals shifted from indoor feeding, consisting of concentrate and forage, to an outdoor grazing diet. Lean dry matter, fat, protein, calcium, and magnesium contents increased throughout the milking season, as did rennet coagulation time, curd firmness, and curd resistance to compression. However, lean dry matter, protein content, and curd resistance to compression stabilized when sheep started to graze. Principal component analysis correlated curd resistance to compression and proteins, whereas curd firmness was highly correlated with fat content and minerals. Discriminant analysis distributed milk samples according to the feeding management. Curd firmness, fat, and magnesium turned out to be discriminant variables. Those variables reflected the evolution of the composition and coagulation parameters when fresh pasture prevailed over other feeds in the diet of the flocks. The present study shows that seasonal changes associated with feeding management influence milk technological quality and that milk of good processing quality can be obtained under part-time grazing. |
| Databáze: | OpenAIRE |
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