Show extremely thin shells show lack of material when egg shells are extremely thin either there la Is not sufficient clent material given the birds so that they can make normal shells or the birds themselves are not able to make the proper use of the material that Is given them the addition of cod liver oil to the ration will help the birds to make better use of the materials that have been fu furnished or a mineral mixture may supply the necessary elements the birds need if birds could g get et out in the direct rays of the sunshine regularly the health giving properties would enable them to make more e efficient use of 0 the feeds and supplements that are given them the practice of keeping layers confined lu in winter prevents this why by glass su substitutes statutes are used to in some of the windows as these substitutes allow the healthful suns rays to pass through when cod liver oll oil Is used it Is added at the rate of 2 pounds to pounds of the mash fed or about 1 pints to pounds of mash |