3380

3055

كارشناسي ارشد

علوم دامي

اصفهان : دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1385

ده، 109، [II] ص.: مصور ، جدول ، نمودار

ص. ع. به فارسي و انگليسي

حميد رضا رحماني ، غلامرضا قرباني

محمد علي ادريس ، عبدالحسين سميع

مسعود عليخاني ، مهدي كديور

مهندسي كشاورزي

ID3055

به فارسي و انگليسي : قابل رويت در نسخه ديجيتال

AbstractThere is limited information available about the relationship between dry period shorteningand calf health and performance Ninety eight Holstein cows and their calves were used toevaluate the effects of dry period length on colostrum quality and calf health Treatmentswere arranged in a 3 2 2 factorial design that included dry period 30 d 42 d and 56 d parity primiparous or multiparous and BCS BCS 3 2 BCS 3 2 and calves wereblocked by sex Actual dry period lengths for treatments were 57 2 4 3 41 7 1 8 and35 2 1 8 d Maternal colostrum was fed at 1 2 1 and 12 3 1 4 h of age in amount of 2L meal Thereafter pooled transitional milk was fed for the next four meals Any calf thatdid not receive maternal colostrum was removed from the study Calves blood sampleswere collected at 0 3 and 24 h postfeeding and 42 d Dams blood were sampledimmediately after parturition Twinning calving score and mastitis incidence at calving daywere also recorded First two milking after parturition were sampled and their density andpH were recorded Calves were fed milk from 3 d until 42 d and thereafter milk replacerwas fed until weaning at 10 of BW d Water and calf starter were offered free choiceafter 3 d Calves were housed in individual pens Calves were weighed at 0 42 and 90 dand their body temperatures were recorded at 12 h intervals from birth until 3 d Health andfecal scores were estimated daily until 42 d Colostrum and second milking s protein lactose TS SNF pH IgG IgM and BSA LG LA Ig ratio were measured Serumtotal protein A G ratio IgG and IgM were determined Data were analyzed using MIXEDprocedure of SAS system Thirty five days dry 35 DD cows produced less colostrumcompared to 56 DD cows 2 9 2 9 and 5 8 3 9 L for 35 DD and 56 DD treatments respectively P 0 05 Colostrum protein 14 07 6 85 and 19 75 5 01 for 35 DD and56 DD treatments respectively P 0 01 TS 21 34 5 21 and 25 12 4 79 for 35 DDand 56 DD treatments respectively and SNF 17 37 3 91 and 22 13 4 70 for 35 DDand 56 DD treatments respectively content were affected by dry period shortening P 0 05 No significant differences due to dry period length were detected for colostrum BSA LG LA Ig ratio IgM fat lactose density and pH Effect of dry periodlength on calving score incidence of mastitis and retained placenta were not significant Calves birth weight serum protein IgG and IgM concentration at 3 h 24 h and 42 d fecaland health scores and ADG were not different between treatments But differences in AEAwere significant between treatments 45 3 9 2 63 07 8 1 and 55 7 9 9 for 35 DD 42DD and 56 DD respectively P 0 05 Data indicated that a short dry period can reducecolostrum quality but its effect on calf health and performance is not significant if adequentvolume of colostrum offered on time

حميد رضا رحماني ، غلامرضا قرباني

محمد علي ادريس ، عبدالحسين سميع

مسعود عليخاني ، مهدي كديور