Asiedu F H, Weever W
University of Guyana, Georgetown.
Trop Anim Health Prod. 1993 May;25(2):111-7. doi: 10.1007/BF02236518.
In Guyana 3 experiments were conducted using 1,440 chicks and 640 pullets and the same number of hens in a randomised block design to determine the growth rate, egg production, and egg fertility and hatchability of 1/2 Creole x 1/2 Rhode Island Red (CR) and 3/4 Rhode Island Red x 1/4 Creole (CRR) fowls compared with the parental strains of Creole (C) and Rhode Island Red (R) fowls. The growth rate of CR and CRR was higher than C, but lower (P < 0.05) than R. Total egg production per hen housed during the pullet year was 59.5, 106.8, 130.7 and 171.8 for C, CR, CRR and R respectively and they were all significantly (P < 0.05) different. There were no significant (P > 0.05) differences between the 4 strains for fertility and hatchability percentages of the eggs which averaged 87.8 and 88.9 respectively. The level of production was comparatively high and mortality low enough for the crossbreds to be recommended for small holder poultry development, although the feed cost of production would be higher for CRR than for CR.
在圭亚那，使用1440只小鸡、640只青年母鸡和相同数量的成年母鸡进行了3项实验，采用随机区组设计，以确定1/2克里奥尔鸡×1/2罗德岛红鸡（CR）和3/4罗德岛红鸡×1/4克里奥尔鸡（CRR）与克里奥尔鸡（C）和罗德岛红鸡（R）亲本品系相比的生长速度、产蛋量、蛋受精率和孵化率。CR和CRR的生长速度高于C，但低于R（P<0.05）。在青年母鸡阶段，每只母鸡的总产蛋量分别为：C为59.5枚、CR为106.8枚、CRR为130.7枚、R为171.8枚，且它们均存在显著差异（P<0.05）。这4个品系的种蛋受精率和孵化率平均分别为87.8%和88.9%，无显著差异（P>0.05）。尽管CRR的生产成本高于CR，但杂交品种的生产水平相对较高，死亡率较低，适合推荐用于小农户家禽养殖发展。
