Tuah A K, Baah J
Trop Anim Health Prod. 1985 May;17(2):107-13. doi: 10.1007/BF02360783.
Production records for a flock of Djallonké sheep kept in the forest belt of Ghana were analysed to determine the effects of some environmental factors on the performance of the breed. The period under study covered April 1969 to November 1979. The mean ages at first conception and first lambing and the mean lambing interval were 498, 638 and 264 days respectively. The overall twinning rate and prolificacy were 30.7 and 130.6% respectively. The season of birth and age of dam had significant (P less than 0.05) effects on prolificacy and twinning rate. The birth weights of the lambs were affected significantly (P less than 0.05) by age of dam, type of birth, sex and season of birth with the mean birth weight being 1.77 kg. Weaning weight (mean of 8.36 kg) and pre-weaning growth rate (mean of 0.076 kg/day) were affected significantly (P less than 0.05) by types of birth. Type of birth significantly (P less than 0.05) affected pre-weaning mortality of lambs (overall mean of 20.95%).
对一群饲养在加纳森林地带的贾隆凯羊的生产记录进行了分析，以确定一些环境因素对该品种性能的影响。研究时间段为1969年4月至1979年11月。首次受孕、首次产羔的平均年龄以及平均产羔间隔分别为498天、638天和264天。总体双羔率和多产率分别为30.7%和130.6%。出生季节和母羊年龄对多产率和双羔率有显著（P小于0.05）影响。羔羊的出生体重受到母羊年龄、出生类型、性别和出生季节的显著（P小于0.05）影响，平均出生体重为1.77千克。断奶体重（平均8.36千克）和断奶前生长率（平均0.076千克/天）受到出生类型的显著（P小于0.05）影响。出生类型对羔羊断奶前死亡率有显著（P小于0.05）影响（总体平均为20.95%）。
