The level of selected blood biochemical indices in lactating ewes and composition of milk
2006
Ondrasovicova, O. | Vargova, M.
The study investigated the relationship between genotypes and some biochemical parameters in the blood and milk of ewes and lambs. It was conducted from 1999 to 2000 at the State Animal Breeding Station at Uhrusk on various crossbreds (Polish Lowland A--- Suffolk A--- Romanowska, Polish Lowland A--- Suffolk A--- Booroola). The blood for examination was sampled twice from 33 sheep and 14 lambs. Samples of milk were collected on days 15, 45 and 75 of lactation. The activity of enzymes aspartate aminotransferase (AST), alanine aminotransferase (ALT), lactate dehydrogenase (LDH) and concentration of triglycerides (TG) in the blood of ewes reached an optimum level. However the total protein (TP) content and IgG in sheep blood were significantly higher than the standard values. Examination of milk showed that the level of fat and proteins increased throughout the lactation period. The mean content of proteins in milk at 15, 45 and 75 days of lactation was 4.79 %, 5.02 % and 5.56 %respectively, and milk fat content in the respective samples reached 5.36 %, 6.45 % and 7.26 %, respectively. With prolonged lactation, lactose content decreased on average from 6.6 % to 4.56 %. The microclimate parameters measured were close to the optimum.
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