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Milk production and milk composition of dairy cows during and after excess of energy supply 4. communication on the influence of excessive energy supply of lactating cows and its consequences



Milk production and milk composition of dairy cows during and after excess of energy supply 4. communication on the influence of excessive energy supply of lactating cows and its consequences



Journal of Animal Physiology and Animal Nutrition 58(3): 134-147



Four pairs of monozygotic twin cows in second lactation were used in a split-plot design experiment with four periods, each of 4 weeks duration. The aim of the experiment was to assess both the direct and indirect effects of an excessive energy supply. For that purpose one partner of each pair in periods 1 and 3 get a concentrate supplementation, which raised the meeting of the theoretical energy requirement for performance up to 113%, whereas the standard fed control group reached 99%. After deduction of requirements of energy for maintenance the relative energy supply raised from 3.15 MJ NEL/kg FCM in the control group up to 3.56 MJ NEL/kg FCM in the experimental group. Response of milk performance on energy surplus was only 0.13 kg FCM/+ 3.17 MJ NEL. Neither parameters of milk performance nor milk composition and yield of milk constituents, respectively, were changed by different energy supply. Also any significant residual effects of the excess energy could not be detecteed in periods 2 and 4 when feeding both groups on the German standard.

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