[The effect of the season of the year and the stage of pregnancy on selenium levels in the blood of sheep].

During one year selenium dynamics in the blood serum of 19 sheep was studied in relation to the degree of gravidity. Seasonal character of selenium dynamics with a positive reaction was demonstrated during the period of grazing, and a dependence of selenium serum concentration on the degree of gravidity was also proved; the highest mean value of selenium was recorded in ewes in the seventh month of gravidity (3.67 mumol.

[Long-term observation of vitamin A and C dynamics and certain biochemical parameters in the blood of sheep which have been raised under modern conditions].

An experiment was conducted with 30 Improved Walachian sheep, aged 2-3 years, fed pelleted feeds in winter and kept on pasture in summer. The study was aimed at studying the amounts of vitamin A, vitamin C, cholesterol, glycaemia, and bilirubin in blood. The described rearing technology, gravidity, and lactation showed no adverse influence on the values of the studied parameters, which were within the physiological numeric range.

[Dynamics of acid-base indices in the blood of lambs from the 7th day of postnatal life to adult age].

Under the conditions of a specialized farm equipped with amodern technology or rearing, sixteen ewe lambs of the Improved Wallachian breed were studied for the dynamics of acid-base indices in the blood from the seventh day of post-natal life unitl the age of 19 months. The acid-base parameters were measured by the Astrup BMS 2 apparatus. After weaning at an age of 45 days, the lambs were fed mixture COJ 1 for ten days, then mixture COJ 2, followed by the administration of a VJ mixture and granular feed in a 1 : 1 ratio.