الفهرس 
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Abstract
To study the effect of dietary niacin, propylene glycol, rumen protected methionine and rumen protected choline on productive indices ( milk yield and calf weight ), milk composition ( protein , lactose and fat ) and some blood parameters of transition dairy cows.
Two separate experiment were performed , first experiment a total 75
clinically healthy Frisian dairy cows with average Bwt 600 - 620 kg and average BCS 3.7 , were divided randomly into three groups.