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Four rams (body weight 50 kg) fitted with ruminal and simple duodenal oannulae were fed at random, in six 14-day periods, rations in a loose (S) and pelleted (G) form, containing 70% of dehydrated maize plant and 0, 1.25 and 2.5% of urea (respectively rations SO, SI, SII and GO, GI, GII). The urea doses were assumed to cover 100 and 200% of the deficiency of rumen degradable N /ARC, 1980/. The duodenal flow of microbial protein N (NBM) was in groups S 8.17, 13,8 and 14.6 g and in G 10.8, 13.7 and 16.1 g/24h. The yield of NBM/100 g O.M. apparently digested in the rumen was, respectively, 1.16, 2.18, 2.00 and 1.66, 2.24, 2.86 g. The effect of physical form on NBM flow and yield was significant (P ˂ 0.05). N-NH₃ level in the rumen fluid was lower in groups S than G, being probably a reason for higher NBM synsynthesis in groups G. Better utilization of urea at its highest level (2.5%) from the pelleted ration can be caused by the decreased degradation in the rumen of feed protein due to pelleting process.
In the years 1977 - 1980 the feeding experiments with high concentration of nitrogen compounds in the diet of ewes were carried out. Both during the summer and winter periods the feeding system "ad libitum" was applied. The lower protein-energy ratio diet gave better results in relation to the wool quality and fleece weight, limited the concentration of nitrates in ewes milk, and caused the high daily weight gains and good development of their progeny. The ewes fad uith diet adapted better their hematopoietic system to the impeded absorption of oxygen. On the contrary the ewes fed with higher protein-energy ratio diet got worse above mentioned indexss but better results in relation to the fertility.
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.
144 One year old sheep /jarka cygajokent/ in 18 coops /8 sheep each/ were tested. During the test 3 feeding groups /6 coops each/ were separated. The mash was composed of - I - 10%, II - 30%, III - 55% of dried grass and 45%, 25%, 0% of dried maize. One group of sheep was fed to the full while the food of the second group was rationed. The sheep had free access to corn and cole straw, water and salt - lick. There were the following daily weight gains /g/: I - 108, II - 86 and III - 130. The consumption of fodder was related to weight gain. The quality of wool of the tested sheep was high. The digestibility factor of mash was average /62 - 65%/ for organic substances. The balance of nitrogen was positive while the phosphorus was relatively balanced.
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