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H. S. Kim*, J. S. Lee**, Y. G. Kim**andW. S. Lee*DairyCattleDivision, NationalLivestockResearchInstitute, RDA*Department of DairyScience, ChungnamNationalUniversity**ABSTRACTThis study examined the effect of corn processing with varying rumen undegradable protein (RUP) onfeed intake, milk yield, its composition and, blood characteristics in Holstein cows during the transitionalperiod (21 days pre partum to 21 days post partum). Twenty Holstein cows were randomly assigned tofour diets (five cows/diet), ground corn with 30 % RUP (GCR30), ground corn with 40 % RUP (GCR40),flaked corn with 30 % RUP (FCR30), and flaked corn with 40 % RUP (FCR40). The processed corn withvarying RUP was fed in total mixed rations (TMR) to cows. Dry matter intake (DMI) was higher with 40% RUP diet than with 30 % RUP diet, resulting in higher protein and energy intake by cows during preand post partum (p 0.05). However, it was not affected by corn＜ processing during pre and post partum.Similarly milk yield was higher with 40 % RUP diet than with 30 % RUP diet. and milk yield wasaffected by corn processing at RUP 30 % level. Corn processing did not affected the milk fat and proteincontents in dairy cows. The concentration of blood non esterified fatty acid (NEFA) were effected by RUPlevel with flaked corn, however, it was non-significant with RUP levels when given with ground corn. Itis concluded that increasing RUP from 30 % to 40 % in iso-nitrogenous diet could increase milk yield indairy cows during the transitional phase.(Key words : Corn processing, Rumen undegradable protein, Milk production, Blood parameter, Dairycow) |
