摘要:

The effect of variations in dilution and numbers of fowl sperm injected into Brown Leghorn hens has been observed in a study of artificial insemination. Fertilization is influenced by the number of sperm introduced in a single injection into the vagina. The number of fertile eggs subsequently produced is affected when the number of sperm is about one hundred million or less, and none are fertile when the number falls below one million.A synthetic diluent containing sodium sulphate, glucose, and peptone supported motilityin vitro, but affected the fertilizing capacity of fowl sperm in proportion to the percentage occurrence of the diluent in the suspension. Sperm serum, comprising about 75% of normal fowl semen, produces little harmful effect and appears to be a more favorable diluent. However, the development of the zygotes conceived by the sperm surviving an unfavorable medium is not impaired, and "hatchability" of the eggs remains unaffected.By comparison of Walton's data for the rabbit with those reported here for the fowl, it is shown that rabbit sperm are more highly resistant to the "toxicity" of certain types of synthetic fluids. Also, it apparently requires 100 times more sperm in the fowl than in the rabbit for conception to result; this may be related to the comparative anatomy of the reproductive tracts.

ISSN:1923-4287    

DOI:10.1139/cjr38d-018

出版商:NRC Research Press    

年代:1938

数据来源: NRC

摘要:

Experiments are described in which adults ofTribolium confusumDuv. are maintained at 27 °C., and 75% relative humidity in four different flour media: (a) ordinary whole wheat flour sifted through 76-mesh bolting cloth, (b) similar flour with from 30 to 135Triboliumeggs per gm., (c) sifted whole wheat flour plus 3% of finely ground wheat germ and (d) flour plus germ plus eggs.It is shown that when large numbers of eggs are eaten, there is a serious decline in egg production unless wheat germ in excess is also present. This is believed to be due to a scarcity of certain accessory growth substances found in wheat germ but not to the same extent in eggs. When ground wheat germ is present, the beetles seem to do somewhat better in the presence of eggs, possibly because of a better water supply, obtained from the eggs.

ISSN:1923-4287    

DOI:10.1139/cjr38d-019

出版商:NRC Research Press    

年代:1938

数据来源: NRC