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The experiment was carried out on 32 cows of Black and White breed in the State Centre of Breeding at Cerkwica, in the farm Karnica in the period from 14 Dec., 87 to 5 Feb., 88 ie. 54 days. The animals were divided into 4 groups by the method of analogues where the basic fodder was grass silage and hay covering together with additionals production of about 10 kg of milk. In particular groups were applied the following additionals: I - control II - dried sugar beet pulp, III - ryegrass meal IV - maize meal. The greatest decline in milk production was in the first group; in other groups only slight decrease was observed although the cows were after peak of lactation. During the experiment an average milk yield was high and similar in all groups. Feed consumption of 1 kg of milk was low. The level of analysed indicies and elements in blood serum were physiologically almost normal.
The aim of the study was to analyse the effect of glycerin supplementation of dairy cow diets on haematological indices. The trial was carried out on two farms keeping 72 (farm S) and 68 (farm R) dairy cows (Polish HF, Black-and-White variety). On both farms the diets were based on maize silage and hay, and on farm S they cows also received haylage. Cows with daily milk yield of over 25 kg received a concentrate mixture. Forty-eight cows were used in the experiment. The experimental factor was glycerin (300 g/head/day) added to the diet for 4 weeks (1 week preceding calving and 3 weeks of lactation). During the experiment (2nd and 6th weeks of lactation) feed intake and milk yield were measured and samples were taken of feeds, milk and blood. The results were analysed statistically using Statistica 5.1 .G using analysis of variance. Significance of differences between means was determined by Duncan’s multiple confidence interval at 0.05 and 0.01. The glycerin supplement (300 g/head/day) influenced the values of blood indices, increasing haematological parameters and leukocyte count and elevating the proportion of lymphocytes in the leukogram. In cases of energy deficiency during the periparturient period in dairy cows, a supplement of 300g/head/d of pure glycerin, administered a week before calving and for 3 weeks of lactation, can be an effective prophylaxis of metabolic diseases in high-yield dairy cows.
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