The Results of Artificial Lights in Winter. IV. Die Folgen intensiver Winterbeleuchtung von Zuchthühnern auf die Eierleistung und auf den Ablauf der Brut. Dr. Bartsch. Archiv für Geflügelkunde, 1939, Nos. 10, 11.

Summary:

III. The experiment about the effect of artificial illumination upon breeders having been finished the progeny of the illuminated birds (pen I) and the birds not illuminated (pen II) was in the course of one year tested as to egg production and condition of health while being managed according to usual farming practice. No difference between the two groups could be established. In twelve months the pullets of the first group had an average production of 181·6 eggs, the pullets of the second group 180·0 eggs. The losses were 6·1 per cent. and 9·4 per cent. respectively. 41·9 per cent. of the birds of the first and 41·7 per cent. of the birds of the second group were kept for another laying year. No detrimental effects of the artificial illumination of the mothers could be noticed in their progeny.

Condition of the Tissues as Determining Factor for Liability to Infection in Vitamin A Deficiency. Histological Investigations with Hens. Die geweblichen Gründlagen der Infektionsbereitschaft bei Vitamin A Mangel. Experimentell Histologische Untersuchungen bei Hühnern. O. Seifried. Berlin. Münch. tierärtzl. Wochenschr., No. 47, 1938, p. 720.

A discussion of the causes of liability to infection in vitamin A deficiency is illustrated by the results of the author's experimental observations on infection and vitamin A deficiency in hens.

Use of the Rapid Whole-Blood Test for Pullorum Disease. H. Bunyea. U.S. Dept. Agric. Misc. Pub., 349, 1939.

A practical account with explicit information concerning the qualifications of a pullorum testing agent, including the details of technique and equipment necessary for the work.

Parafield Egg-Laying Competition, 1938–39. M. W. Aird. Journal of Agriculture, South Australia, July, 1939.

Number of birds that completed test, 352. Average number of eggs per bird, 187·12. Average cost of food per bird, 5s. 6·8d. Average return per bird, 17s. 10·3d. Return over cost of feeding, 12s. 3·5d.

Total 51 deaths from the 403 birds competing = 12·6 per cent.