Annual Report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station (2; V. 31 ) (Paperback)

Ce livre historique peut avoir de nombreuses fautes de frappe, le texte manquant, des images ou des index. Les acheteurs peuvent telecharger une copie gratuite scannee du livre original (sans fautes de frappe) de l'editeur. Non illustre. 1919 edition. Extrait: ...distinction between meat or work animals and dairy animals that has been neglected. The return of nitrogen is subject to the greatest variation by the animal, and the return of potassium to the least. A dairy cow giving a heavy flow of milk returns from 40 to 65 per cent of the nitrogen consumed, from 60 to 80 per cent of the phosphorus, and from 70 to 85 per cent of the potassium. A cow giving a small flow of milk returns a correspondingly larger amount of nitrogen, phosphorus, and potassium. An ox or a meat animal returns from 75 to 95 per cent of the nitrogen, from 65 to 85 per cent of the phosphorus, and from 90 to 98 per cent, or even more, of the potassium. Growing animals retain practically all the phosphorus in the digested part of the food. This means that in the undigested part of the food there remains less than half of the total amount of phosphorus consumed to find its way into the manure. These figures are summarized in table 1. TABLE 1. Loss Of Constituents Of Food In Process Of Digestion Shown By The Proportion Returned In The Manure In New York, where the dairy animal is such an important type of livestock, the heavy draft it makes on the organic matter and the plant nutrients in the food and the corresponding smaller return in the manure, as compared with that made by other types of animals, should be kept clearly in mind. The larger the milk production of the cow, the smaller is the proportion of the food returned in her manure. The approximate Percent Fig. rounds of mi/k produced per dou 12. APPROXIMATE PROPORTION OF PLANT NUTRIENTS IN FOOD RETURNED IN THE MANURE IN RELATION TO THE AMOUNT OF MILK PRODUCED Milk is relatively richer in nitrogen than are the foods ordinarily...