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- Title
Влияние на селеново-йодната суплементация върху млечността и съдържанието на селен и йод в млякото през пасищния период на овце отглеждани в Средните Родопи
- Authors
Гаджев, Димитър; Блажев, Борислав; Оджакова, Цонка; Ангелов, Любомир
- Abstract
The experiments were carried out with 20 ewes of the Karakachan breed, divided into two groups (2x10). Тhe animals were fed ad libitum on pasture areas with different amounts of selenium and iodine during the grazing period. Complete diet contained low levels of selenium (0.065 mg Se/kg DM) and sub optimal content of iodine (0.096 mg I/kg DM). The control group received additionally 0.25 mg Se/day as NaHSeO3 and 0.10 mg I/day as KI during the whole investigated period (90 days). The insufficient Se and marginal iodine offer during lactation period led to decrease of milk production, daily protein and trace element secretion. From 30.April to 30.Junе the pasture grass offer about 50% from selenium and 70% from iodine of the animal needs. Deficient ewe’s produced on the average 19% less milk with natural fat content. The protein secretion via milk was reduced by 32% in comparison to the supplemented group. Furthermore, the Se content in the deficient milk and daily Se-secretion were significantly decreased by 178% and 401% during the grazing period. In order to achieve maximum milk production, a mandatory correction of selenium-iodine supply in the lactating sheep farmed in the region of the Middle Rhodopes (Bulgaria) is necessary.
- Subjects
ANIMAL breeding; PASTURES; ANIMAL nutrition; MILK yield; MILK quality; RUMINANTS
- Publication
Journal of Mountain Agriculture on the Balkans (JMAB), 2018, Vol 21, Issue 3, p37
- ISSN
1311-0489
- Publication type
Article