Effect of concentrate supplementation on milk production chemical features and milk volatile compounds in grazing goats | Effet de la nature de la complémentation sur la production laitière, les charactéristiques chimiques et la teneur en composés volatils du lait de chèvre au pâturage
2005
Claps, S.(Istituto Sperimentale per la Zootecnia, Muro Lucano (PZ), (Italy)) | Rubino, R. | Fedele, V. | Morone, G. | Di Tirana, A.
Forty-five lactating Siriana goats were divided into three homogeneous groups: (i) G, grazing for 8 hours/day; (ii) GRD, grazing plus 600 g/day of rapidly degradable concentrate; and (iii) GNRD, grazing plus 600 g/day of slowly degradable concentrate. A native herbaceous pasture was used. Physical-chemical analyses and volatile organic compounds (VOC) determination were performed on three cumulative milking samples, collected for each season in every group. Supplemented grazing groups showed significantly higher levels (P 0.05) of milk production (295.7 kg in GRD and 276.7 kg in GNRD) than not supplemented groups (248.6 kg). In relation to grazing season, the concentrate supplementation involved a different effect on milk VOC content. The VOC content, in winter and spring, was related to herbage intake, while in summer the plants selected by animals play a main role
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