12996

11879

كارشناسي ارشد

علوم دامي

اصفهان : دانشگاه صنعتي اصفهان

1396

ده، ۳۳ص.

ابراهيم قاسمي، محمد خوروش

فرزاد هاشم زاده، حميد رضا عشقي زاده

1396/08/16

كتابنامه

كشاورزي

مهندسي برق و كامپيوتر

ID11879

37 Effect of Substituting Alfalfa Hay With Forage and Non forage Fiber Sources Based on Undigested Neutral Detergent Fiber on Performance of High producing Lactating Cows Mohammad Mehdi Haj mahmoudi Mmhv1366@gmail com Jun 20 2017 Department of Animal Sciences College of Agriculture Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor ABSTRACTThe objective of this study was to evaluate the effects of partial substitution of alfalfahay with high fiber by products wheat straw and beet pulp on intake digestibility chewing activity and milk production of high yielding dairy cows Eight multiparouscows 54 2 5 kg milk production 78 5 DIM were used in a 4 4 Latin square designexperiment and fed 4 diets containing alfalfa hay which were partially replaced by 1 noby products control 2 beet pulp wheat straw 3 wheat straw and 4 treated wheatstraw Experimental diets were balanced for NEL 1 64 Mcal kg crude protein 16 9 as well as fiber physical characteristics and digestibility peNDF 20 3 uNDF 12 Substitution of alfalfa hay with by products feeds reduced feed cost unit by 4 Resultsindicated that cows fed straw beet and treated straw diets had greater nutrientdigestibilities than those fed wheat straw or control diet P 0 01 Milk and 3 5 FCMproduction and milk composition did not differ across treatments Cows received by products substitutes showed greater dry matter intake than control cows P 0 01 Thus milk production efficiency tended P 0 08 to increase with feeding control diet but3 5 FCM production efficiency were similar among diets Ruminal pH total VFAconcentration molar proportion of acetate and chewing behavior were not affected bydietary treatments However feeding diets containing by products substitutes tended todecrease molar proportion of propionate P 0 09 and increase acetate propionate ratio P 0 06 Chewing dietary physical effective NDF acetate propionate ratio milk fatcontent and fat to protein ratio indicated that in all groups cows were fed a loweffective fiber Substituting wheat straw with without beet pulp for alfalfa hay based onfiber characteristics resulted to similar milk production in high producing dairy cows Keywords undigested fiber wheat straw beet pulp economic return

ابراهيم قاسمي، محمد خوروش

فرزاد هاشم زاده، حميد رضا عشقي زاده