| Show scientists measure and control vitamins for modern gray summit mo few things arc conspicuous by their absence but vitamins are among the few that are since a great deal of vitamin knowledge has been brought about by showing what happens when vitamins are not pr present besent here at the purina experimental farm thousands of tests have been run on poultry of all ages sometimes an abundance of vitamins have been included other times feeds lacking in vitamins have been fed these experiments have disclosed some interesting nutritional facts weak legs poor feathering retarded growth bronchial troubles poor pigmentation lowered production disease and infection have al been accounted for by lack 0 of the e proper vitamins in poultry feed poultry need vitamins the most important vitamins in po poultry ul feeding are vitamins A D and G they are most important because they are most likely not to be present in sufficient amounts to promote growth and health the process of counting or measuring vitamins is a tedious and expensive one and only feed manufacturers equipped with complete biological laboratories trained scientists and plenty of animals to experiment with cari can make commercial use of the present day knowledge of vitamins vitamin control new vitamin control in poultry feeds is relatively new vitan vitamins ans were discovered about 22 years ago but most of the usable knowledge about them has come to the front since 1920 in 1935 purina scientists were able to announce that a 1 i N vitamin A can now be measured through a machine called the spectrophotometer new vitamin A concentrate had been discovered and could be efficiently and economically added to poultry feeds to improve growth pigmentation a and laying purina laying mashes were stepped up 2 Vs times in vitamin A content by the addition of Pu which contains carotene the vegetable form of vitamin A vitamin A essential vitamin A is needed by baby chicks growing pullets and layers especially do laying hens need plenty of vitamin A to keep up production through winter months abundance of Vit vitamin arnin A in the laying mash prevents breakdown among birds and cuts mortality among the flock pullets that have been grown out on a feed containing sufficient amounts of vitamin A go into the laying house with strong well de bodies and axe are able to keep up heavy production without breakdown and turn into extra profits for their owner vitamin D the sunshine vitamin is absolutely necessary if hens are kept indoors for baby chicks as much as 30 units of vitamin D per every grams of feed must be given for proper bone development and growth the best known source of vitamin D for poultry feeds is cod liver oil the same source recommended for humans iche the finest 0 o potency of cod liver oil is measured through assay tests on live animals grade of cod liver oil the world produces Is used in purina poultry mashes each shipment is tested through assay tests on both white rats and chicks before it is put into feeds going into the checkerboard bag vitamin G now added most recent of the vitamin discoveries is vitamin G which plays an important part in hatchability purina laying and breeding mashes contain a sufficient amount of vitamin G to cut down losses from eggs that dont hatch vitamin G is measured in the purina laboratories by use of a new instrument the Flav ometer this instrument w was as developed by two purina scientists and is used to determine the vitamin G content in feed give us your order for printing |
