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Influence of different zinc-iodine-selenium supplements to the diet of ewes during pregnancy and lactation on the milk performance and trace element content


Influence of different zinc-iodine-selenium supplements to the diet of ewes during pregnancy and lactation on the milk performance and trace element content



Ecology and Future 3(1): 11-15



ISSN/ISBN: 1312-076X

The influence of zinc, selenium and iodine supplementation during the first 56 days of lactation in sheep was investigated. 13 South Corriedale ewes were divided into 2 groups. During the lactation period, the control group was supplemented with 30 mg Zn, 0.20 mg Se and 0.11 mg I/kg dry matter (DM). The second group received feed containing low levels of Zn (21.7 mg/kg DM), Se (0.061 mg/kg DM) and I (0.113 mg/kg DM). Milk samples were collected on the 14th, 28th, 42nd and 56th day of lactation. During the suckling period the unsupplemented ewes produced 29% less milk with natural fat contents in comparison to the control group (676 vs. 474 ml/day, respectively). The Zn-Se-I-deficiency also negatively influenced the milk fat and protein production. A significant difference was found between the 2 groups on the 14th day of lactation. Within the whole lactation period, the deficient sheep produced one third less milk fat compared to the control sheep (29.0 vs. 19.2 g/day, respectively). Similar results were obtained for the daily milk protein production. The addition of Zn, Se and I had a positive effect on the milk protein synthesis. The deficient ewes produced 25% less milk protein during the lactation period (P<0.001). The control animals produced milk with a lower percentage of fat (4.23 and 4.28%, respectively) and protein (4.21 and 4.45%, respectively). The natural Se, Zn and I deficiency in the diet influenced not only the dairy performance but the trace element contents and their daily secretion as well. The unsupplemented ewes produced on the average milk lacking in Se (16 micro g/litre), Zn (4.55 g/litre) and I (9.28 micro g/litre) in comparison to the control group (Se, 31 micro g/litre; Zn, 6.64 mg/litre and I, 33.4 micro g/litre). In conclusion, low levels of dietary zinc, selenium and iodine leads to low milk, milk fat and milk protein production in dairy ewes.

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Accession: 004203140

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