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The aim of this study was to test if supplemental vitamin E during late gestation and early lactation to ewes facing a moderate nutritional restriction and suckling lambs from different litter size and sex would affect colostrum composition and milk yield and composition. Mature Rambouillet ewes (n = 37, 22°N) receiving 70%25 of energy and 80%25 of protein requirements were randomly assigned to either of two treatments: intramuscular injections of vitamin E (VitE; n = 20, 4 IU vitamin E kg-1 of live weight) in weekly intervals from 50 days before partition until 60 days of lactation, and control (CON; n = 17, without VitE treatment). While colostrum protein and fat concentrations did not differ between treatments (P > 0.05), lactose content favoured to the VitE-ewes (1.9%25 vs. 1.2%25, P < 0.001). Colostrum protein concentration was affected by litter size favouring to twin lambs (14.3%25 vs. 17.3%25, P < 0.05). In addition, litter size tended to affect lactose content, favouring to those ewes suckling twins (1.4%25 vs. 1.8%25, P = 0.08). The average milk yield was 2039 g day-1, without differences (P > 0.05) between treatments and litter size. The average milk concentrations of protein, lactose and solids-non-fat did not differ (P > 0.05) between treatments. Yet, milk fat content favour to the VitE-ewes (5.7%25 vs. 5.2%25, P < 0.05). Milk concentrations of protein, fat, lactose and solids-non-fat were not affected (P> 0.05) by litter size. Non-significant treatment × litter size interactions (P> 0.05) were observed for milk yield, milk compositions of protein, fat and lactose and solids-non-fat. When the nutritional requirements are not met, treatment of vitamin E to ewes during late gestation and early lactation might be an strategy to improve the quality of both colostrum (>lactose) and milk (>fat). © 2015 Elsevier B.V.
Effects of vitamin E supply during late gestation and early lactation upon colostrum composition, milk production and quality in nutritional restricted ewes
Colostrum composition; Milk production and composition; Nutritional restriction; Vitamin E
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