بررسي تاثير شكل فيزيكي استارتر﴿دانه جو﴾ بر عملكرد و معرف خوراك در گوساله هاي شيري

چكيده انگليسي :

Effects of Physical Form of Starter Barley Grain for Dairy Calves on Feed Intake and Performance Ali Jarrah ali jarrah61@gmail com Date of Submission 2011 11 30 Department of Animal Science Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor G R Ghorbani Ghorbani@cc iut ac irAbstractThe present study was conducted to evaluate the effects of different physical processing methods ofbarley grain in starter on starter intake average daily gain ADG feed efficiency skeletal growth fecalscore and rumen pH of neonatal dairy calves For this purpose thirty two Holstein dairy calves 16 femaleand 16 male were used in a completely randomized design and data from trial were analyzed usingSAS9 1 statistical software and the MIXED procedure Calves were randomly allocated to one of the fourtreatments consisting of coarse ground whole steam rolled and roasted barley from day 4 to 56th days ofbirth Experimental units were randomly assigned to individual pens Starters were formulated to havesimilar ingredients and composition All calves had ad libitum access to water and starter throughout thestudy All calves received 4 L of milk d from a nipple bottle from d 4 to 41 and 2 L d from d 41 to 45 when trying to wean the calf weaning occurred on 45 day for all of calves Starter intake DM and fecalscore recorded daily Body weight and skeletal growth factors body length body barrel heart girth hipheight and hip width had been measured at the beginning of the study and at 45 and 56 d of age Rumenfluid and blood samples were collected during 35 45 and 56 d of age Results of the present studyindicate that processing of barley with different methods had no significant effect on dry matter intake average daily gain and feed efficiency In general there were no significant differences between differenttreatments but calves fed steam rolled barley gained higher weight after weaning and calves fed coarseground barley gained the final weight but these differences wasn t significant Also skeletal growthfactors health and pH of the rumen were not affected by treatments There was significant differences inapparent digestibility of crude protein between calves fed steam rolled and whole with roasted barley p 0 003 but no significant differences were observed between other treatments Thus the differencesbetween calves fed roasted barley and coarse ground barley in ether extract fat digestibility wassignificant p 0 01 while the differences between other treatments were not On the other hand therewas a significant difference in apparent digestible factors of dry matter DM between steam rolled withcoarse ground and roasted barley p 0 009 but no significant differences were observed between othertreatments Apparent digestibility of NDF between claves received whole and roasted was significantlydifferent p 0 03 while the differences between other treatments were not In conclusion our resultsshows that different processing method of barley in starter had no effect on performance of dairy calvestherefore feeding whole or coarse ground barley would be more economical method of processingcompared steam rolled and roasted barley Finally we assume that the effects of processing methods ofbarley grain in starter has been influenced highly by chewing activity in new born dairy calves Key words dairy calves starter physical form barley performance processing

جراح، علي

بررسي تاثير شكل فيزيكي استارتر﴿دانه جو﴾ بر عملكرد و معرف خوراك در گوساله هاي شيري

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