Variations in the weights of hatched and unhatched ducks' eggs
成果类型：
Article
署名作者：
Rendel, JM
刊物名称：
BIOMETRIKA
ISSN/ISSBN：
0006-3444
DOI：
10.2307/2333619
发表日期：
1943
页码：
4858
关键词：
摘要：
Weights'' measurements of eggs from 2 breeds of ducks were made. A record was kept as to whether or not each egg hatched. The author concludes that the further the wt. of an egg is from the mean wt., the smaller is its chance of hatching. Eggs with wts. outside the range 70-76 g. lose rapidly in hatchability with each gram that their wt. moves farther from the mean. At 67 and 80 g. the loss is approx. 1% per g. and at 62 and 85 g., the loss is 1 2/3% per g., with a total loss of 11% over eggs of mean wt., whereas at 90 g. the rate of loss is 21/2% per g., with a total loss of 20% over eggs of mean wt. Variabilities between and within progenies are given for good and bad eggs. It is concluded that selection will tend to reduce variation in egg wt. J. B. S. Haldane derives the coeff. of variation of egg volume in Appendix 1 and develops formulas for finding the variabilities within and between progenies in Appendix 2.