الفهرس 
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Abstract
The main objective of study was to evaluate the effect of partially substituting of corn and partially of undecorticated cottonseed meal by corn gluten feed (CGF) on nutrient digestibility, nutritive value, rumen liquor parameters, some blood constituent, milk production, feed utilization and economic efficiency of Friesian cows. The present study was conducted at El-Karada Animal Production Research Station, Animal Production Research Institute, Agricultural Research Centre, Egypt and Animal Production Department, Faculty of Agriculture, Mansoura University. In this study, the weight of the twelve cows was ranging from 435-570kg. The animals in this study were in the 2nd to 4th lactation season. In order to study the production of milk and its composition by the effect of the tested rations, cows were subdivided into four groups (three cows in each group). The period of the experiment was 140 days (20 weeks) after 6 weeks from calving and all groups were fed individually.The formulating four types of concentrate feed mixture (CFM) as follows:
1 – CFM0% (0% CGF): 40% corn grain, 30% wheat bran, 23% undecorticated cottonseed meal, 5% molasses, 0.5% salt and 1.5% limestone. 2 - CFM10% (10% CGF): 35% corn grain, 30% wheat bran, 10% CGF, 18% undecorticated cottonseed meal, 5% molasses, 0.5% salt and 1.5% limestone. 3 - CFM15% (15% CGF): 32.5% corn grain, 30% wheat bran, 15% CGF, 15.5% undecorticated cottonseed meal, 5% molass, 0.5% salt and 1.5% limestone. 4 - CFM20% (20% CGF): 30% corn grain, 30% wheat bran, 20% CGF, 13% undecorticated cottonseed meal, 5% molasses, 0.5% salt and 1.5% limestone.The four experimental rations as DM were formulated nearly as follows:1 – Control ration: 52% concentrate feed mixture (0% corn gluten feed) + 20% corn silage (CS) + 28% rice straw (RS).2 - Experimental ration 1: 52% concentrate feed mixture (10% corn gluten feed) + 20% corn silage + 28% rice straw.3 - Experimental ration 2: 52% concentrate feed mixture (15% corn gluten feed) + + 20% corn silage + 28% rice straw.4 - Experimental ration 3: 52% concentrate feed mixture (20% corn gluten feed) + + 20% corn silage + 28% rice straw.The results obtained are summarized as follows:1 - The concentrate feed mixtures with or without corn gluten feed were contained similar values of NFE, Ash, NDF, hemicellulose and NFC %. 2 - The average total DMI were higher with feeding on Exp.1 and Exp.2 than feeding on the control and Exp.3.3 - The ruminal fibrolytic bacteria count was almost higher (P<0.05) with feeding on Exp.1, Exp.2 and Exp.3 respectively than feeding on control at 0 hr pre-feeding.4 - The ruminal amylolytic bacteria count was almost higher with feeding on control at 2 hr up to 8 hrs post-feeding then feeding on Exp.2.5 - The average daily milk yield with feeding the experimental rations was not significantly affected from week 1 to week 20.6 – Milk protein % was higher (p <0.05) with feeding on Exp.1 than feeding on Exp.2 or Exp.3, but there was no significant effect with the control ration.7 – The best value of feed conversion were recorded with feeding on rations containing corn gluten feed: Exp.1, Exp.2 and Exp.3 compared with the control which was without corn gluten feed.8 - The highest values of the profit were with feeding on Exp.1, Exp.2 and Exp.3 compared with feeding on the control.CONCLUSION: Corn grain and undecorticated cottonseed meal can be replaced by 15% corn gluten feed are often considered for enhancing production of milk, economic efficiency. While substitution of corn and cottonseed meal at a level of at least 10% (DM basis) improve utilization fed nitrogen, such substitution resulted in improving percentage of milk protein.