Factors Associated with Body Weight Attainment in Calves on Smallholder Dairy Farms in Tanzania  

作　　者：Jelly Senyangwa Chang’a Torleiv Loken Robinson HMdegela Olav Reksen 

机构地区：[1]Livestock Research Centre,Ministry of Livestock Development,Tanga,Tanzania [2]Department of Production Animal Clinical Sciences,Norwegian School of Veterinary Science,Oslo,Norway [3]Department of Veterinary Medicine and Public Health,Faculty of Veterinary Medicine,Sokoine University of Agriculture,Morogoro,Tanzania

出　　处：《Open Journal of Veterinary Medicine》2012年第2期66-73,共8页兽医学（英文）

基　　金：the Norwegian Government through the PANTIL project at Sokoine University of Agriculture

摘　　要：In order to investigate associations between individual calf parameters and/or herd management practices and dairy calf body weight (BW) attainment in smallholder farms in Tanzania, a prospective study was carried out at 121 farms in Mvomero and Njombe districts and included 156 crossbred dairy calves. Information on management factors and sources of calf drinking water were collected by personal observation and interview during four visits. At each visit, BW assessments were conducted by the same veterinarian and blood samples collected. The blood samples were analyzed for hematological parameters, total blood protein, glucose, and serum phosphorus and urea. Low BW was associated with smaller amount of milk fed to calves, early weaning, birth during the wet season, and well/tap water as the main water source (P < 0.05). Low blood total protein, high urea, low phosphorus and low hemoglobin concentrations were also associated with retarded growth. These findings identified and quantified some critical factors that can guide farmers in improving calf performance on smallholder dairy farms in Tanzania. To improve calf BW, the protein and mineral fraction of the roughage should be increased and water supply should be improved. In conclusion, appropriate changes in milk feeding routines and breeding management would also be expected to improve productivity.In order to investigate associations between individual calf parameters and/or herd management practices and dairy calf body weight (BW) attainment in smallholder farms in Tanzania, a prospective study was carried out at 121 farms in Mvomero and Njombe districts and included 156 crossbred dairy calves. Information on management factors and sources of calf drinking water were collected by personal observation and interview during four visits. At each visit, BW assessments were conducted by the same veterinarian and blood samples collected. The blood samples were analyzed for hematological parameters, total blood protein, glucose, and serum phosphorus and urea. Low BW was associated with smaller amount of milk fed to calves, early weaning, birth during the wet season, and well/tap water as the main water source (P < 0.05). Low blood total protein, high urea, low phosphorus and low hemoglobin concentrations were also associated with retarded growth. These findings identified and quantified some critical factors that can guide farmers in improving calf performance on smallholder dairy farms in Tanzania. To improve calf BW, the protein and mineral fraction of the roughage should be increased and water supply should be improved. In conclusion, appropriate changes in milk feeding routines and breeding management would also be expected to improve productivity.

关 键 词：BODYWEIGHT CALF HEMATOLOGY Management Smallholder Dairy Farmers 

分 类 号：R73[医药卫生—肿瘤]