The effect of part-time grazing on milk production and quality, with three different feeding systems of indoor-supplied fodder, was studied in flock of Turcana sheep. The control group (group P) had permanent access to the pasture (full-grazing) without additional ration. For the other 3 groups (part-time grazing), the grazing period was limited to 6 hours/day, divided in two rounds meant to circumvent the high temperatures during the day. The diet of ewes in the part-time grazing groups was supplemented with 500 g dry matter (DM) mixture concentrate (group C); 1000 g DM grass hay (group H); or 500 g DM grass hay + 200 g DM concentrate + 180 g DM camelina oil calcium soaps (group S). Indoor-supplied diets ensured a contribution of 0.70 – 0.72 UFL and 97-104 g CP/day. Treatments had no effect on milk production or milk protein content. Camelina oil calcium soaps (Cs) supplementation caused an increase in milk fat and a higher quality of energy corrected milk (ECM) (p <0.01). The full-grazing system proved beneficial for supplying milk rich in α-linolenic acid, cis-9, trans-11CLA and C18:1 trans-11, while also condoning a reduction in the oxidation process of fats (p <0.001). Part-time grazing and supplementing the diet with concentrates or grass hay compromises nutritional characteristics of milk with increased proportion of hypercholesterolemic FA (HFA), a higher value of atherogenicity index (AI) and increased antioxidant capacity of milk (p <0.001). Ewes fed via feeding systems, with a limited access to pasture and moderate amounts of concentrate, hay and Cs did not change milk fatty acid profile and oxidative stability of the milk with respect to full grazing group. The experiment confirmed that it is possible to improve the nutritional characteristics of milk production by implementing a feeding system that combines local resources and a reduced amount of indoors provided concentrate, hay and Cs.
Online ISSN: 1459-0263Year: 2015, Vol. 13, Issue 2, pages 130-137.Publisher: WFL.
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