Nkhonjera L, Agymang K, Butterworth M H
Ministry of Agriculture, Department of Veterinary Services Headquarters, Capital City, Lilongwe, Malawi.
Trop Anim Health Prod. 1988 Aug;20(3):155-60. doi: 10.1007/BF02240084.
Information on the initial and final weights, length of feeding period, grade of the live animal before slaughter, carcass weight and dressing percentage of 2,498 stall fed Malawi zebu (MZ) and crossbred steers from Southern Region and 2,085 steers from the Central Region of Malawi is analysed. Agricultural and household residues were the basis of the feeding system. The genetic composition of individual animals was not known; weight groups were therefore used as proxies for breed types. Final weights were significantly influenced by breed, month and year when the feeding period was started and breed by month interactions. The mean stall feeding period in the South was 188 days and the average daily gain was 0.59 kg. Steers in the Central Region were fed for 213 days and gained on average 0.50 kg per day. Breed did not exert a significant effect on weight gain. However, when daily gain was compared on the basis of metabolic body size, MZ i.e. smaller steers gained significantly more rapidly than crossbred steers. The dressing percentage of animals from both regions was 52.3%. The carcass weight of crossbred steers was higher than that of MZ steers. It is concluded that an effective fattening system can be based on locally available resources and a similar system could be suitable for other parts of the developing world.
对来自马拉维南部地区的2498头圈养马拉维瘤牛（MZ）和杂交阉牛以及来自马拉维中部地区的2085头阉牛的初始体重和最终体重、育肥期长度、屠宰前活体动物等级、胴体重和屠宰率信息进行了分析。农业和家庭残余物是饲养系统的基础。个体动物的基因组成未知；因此，体重组被用作品种类型的替代指标。最终体重受到品种、开始育肥期的月份和年份以及品种与月份的交互作用的显著影响。南部地区的平均圈养期为188天，平均日增重为0.59千克。中部地区的阉牛育肥213天，平均日增重0.50千克。品种对体重增加没有显著影响。然而，当根据代谢体重比较日增重时，MZ即体型较小的阉牛比杂交阉牛增重明显更快。两个地区动物的屠宰率均为52.3%。杂交阉牛的胴体重高于MZ阉牛。得出的结论是，有效的育肥系统可以基于当地可得资源，类似的系统可能适用于发展中世界的其他地区。
