Agyemang K, Nkhonjera L P
International Livestock Centre for Africa, Addis Ababa, Ethiopia.
Trop Anim Health Prod. 1990 Feb;22(1):9-16. doi: 10.1007/BF02243490.
A 10-year set of dairy records from a smallholder dairy scheme in the Republic of Malawi was analysed. Environmental and breed effects on the reproductive and productive parameters were evaluated. Age at first calving for 110, 1/2 Friesian and 55, 3/4 Friesian cows were 36.7 and 40.1 months respectively; calving intervals based on 432 and 145 records were 488 and 482 days; total lactation yields on 554 and 227 records were 1,950 and 2,452 kg. Geographical area of operation, parity of cow, year and month of calving and their interactions did not exert a significant influence on reproductive traits but significantly influenced milk production traits. Deficiency in feed supplies was believed to be a possible cause of problems in reproductive performance.
对马拉维共和国一个小农户奶牛养殖计划的10年奶牛记录进行了分析。评估了环境和品种对繁殖及生产参数的影响。110头1/2弗里斯兰奶牛和55头3/4弗里斯兰奶牛的初产年龄分别为36.7个月和40.1个月;基于432条和145条记录的产犊间隔分别为488天和482天;基于554条和227条记录的总泌乳量分别为1950千克和2452千克。经营的地理区域、奶牛胎次、产犊年份和月份及其相互作用对繁殖性状没有显著影响,但对产奶性状有显著影响。饲料供应不足被认为是繁殖性能出现问题的一个可能原因。