Continuing snippets from the same book.
"Conditions Usually Found.
- (1). The average farm flock does not consume sufficient feed for profitable egg production.
-(2). The hens receive little or no grain while on range from early spring until late fall.
-(3). They do not usually receive sufficient green feed or its equivalent during the winter, nor sufficient animal protein and minerals."
"... big problem is to get the right balance of feed nutrients. ... What would happen if the hen were fed on wheat alone? She would get enough protein to make an egg about every three days, enough lime to make an egg every 12 days, and enough carbohydrates and fat to make three eggs a day. ... the hen will frequently take the lacking materials from her own body, thus weakening it for future production."
"If the hen has an insufficient amount of the right kind of protein, she will not lay eggs."
"Experiments show that protein of other plant origin will not supplement grain protein very efficiently. For example, linseed-meal and corn-meal proteins will not work well together. The same is true of other plant proteins such as soybean meal, cottonseed meal, and gluten feed. ... where a mixture of the proteins of corn and linseed meal showed an efficiency of growth of less than 40, skim-milk and corn showed an efficiency of 65."
"Vitamins. - Little is known about these substances except that their absence results in malnutrition. Especially is this true for high-producing hens which are under an intense nervous strain."
"Green feed or its equivalent is one of the vital parts of the ration for laying hens and is frequently one of the most difficult to supply. In summer, this can be supplied by good range. After the range is depleted in late summer, cabbage is the most easily provided. ... Experiments show that alfalfa, red clover, or soybean hay gives satisfactory results. The hay should be cut when the plants are immature, to ensure a large proportion of the green leaves which are rich in vitamins. It must be cured without getting wet and must be of high quality. Soybean hay should be cured when the seeds are beginning to form in the pods. ... Hay kept before hens at all times."
Edit to fix typos