Carotenoids in feedstuffs and their role in milk production | Lopbarībā esošo karotinoīdu raksturojums un loma piena ieguvē
2011
Antone, U., Latvia Univ. of Agriculture, Sigulda (Latvia). Research Inst. of Biotechnology and Veterinary Medicine Sigra | Jemeļjanovs, A., Latvia Univ. of Agriculture, Sigulda (Latvia). Research Inst. of Biotechnology and Veterinary Medicine Sigra | Osmane, B., Latvia Univ. of Agriculture, Sigulda (Latvia). Research Inst. of Biotechnology and Veterinary Medicine Sigra | Sterna, V., Latvia Univ. of Agriculture, Sigulda (Latvia). Research Inst. of Biotechnology and Veterinary Medicine Sigra
Carotenoids are involved in the sensory and nutritional values of dairy products. The milk used for consumption or dairy processing should have a high antioxidative capacity to achieve high-quality products. Feeding is one of the most significant factors influencing cow productivity, and composition and quality of milk. It is expected that milk from cows fed silage has higher concentration of β-carotene and α-tocopherol than milk from cows fed hay. In grazing systems herbage maturity stage affects the amount of carotenoids ingested and may affect carotenoid concentrations in milk. In the present study, the content of total carotenes in different forages was analysed, and the content of β-carotene, vitamin A and vitamin E in milk samples was investigated. It was detected that the average content of total carotenes in feed samples of silage, haylage, hay, grass, clover, rapeseed cake, and carrots was respectively 87.64, 7.57, 1.78, 24.06, 47.13, 2.96, and 138.95 mg kgE-1 of dry matter. The results of investigations showed that the content of total carotenes in pasture grass, clover and stem-grass samples decreased from June till August. Correlation between the protein and total carotenes content in pasture grass samples was calculated (r=0.49, p is less than 0.05). The content of β-carotene (131 μg LE-1), vitamin A (44 μg LE-1), and vitamin E (48 μg LE-1) in milk samples was higher when the feed of cows had higher content of total carotenes, e.g. 830 mg per cow per day. The milk samples demonstrated an average content of β-carotene (40 μg LE-1), vitamin A (37 μg LE-1), and vitamin E (35 μg LE-1) when cows were not provided with an optimal content of total carotenes.
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