Meeting the protein requirement of dairy cows in a long-term feeding experiment
1997
Oll, Ue. | Toelp, S. | Toelp, J. | Paern, H. (Estonian Agricultural Univ., Tartu (Estonia))
The aim of this work was to compare three possibilties of meeting the protein requirement of dairy cows. Altogether 72 Estonian Red cows with 200 periods of lactation were used in the experiment. The treatments differed in the composition of concentrate feeds as follows: (a) complete concentrate feed (produced in a feed manufacturing plant), (b) barley meal + oil meal, (c) barley meal + urea. Urea was supplied to barley meal at the rate of 2.5 or 3.5 per cent. The results are given per cow and lactation. The milk yield (kg), milk fat and protein content (percentage), and the milk fat and protein yield (kg) were was follows: (a) 4478, 4.17, 3.555, 186.9 and 159.0, (b) 4556, 4.08, 3.48, 185.7 and 158.6, (c) 4492, 4.11, 3.555, 184.8 and 159.4. The ECM-yield made up: (a) 4594, (b) 4608 and (c) 4569 kg. It can be concluded that the milk yield was practically on the same level in all groups. Urea can meet the protein requirement, if it is carefully used. No urea poisoning was noticed
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