Milk gland

“ Such a structure indicates very fully developed digestive organs, which exert a powerful influence on the exercise of all the functions of the body, and especially on the secretion of the milky glands, accompanied with milk-veins and udder partaking of the same character as the stomach and viscera, being large and capacious, while the external skin and interior walls of the milk-glands are thin and elastic, and all parts arranged in a manner especially calculated for the production of milk. ”

“ By diluting with water to reduce the protein and salts, and adding sugar and a little cream, the proportions of these different substances may be made to approximate those in mother's milk. In both the sugar is the same—lactose, or milk-sugar; the fats are also much alike in each; but the albuminous matter of cow's milk differs somewhat from that of human milk, particularly in the way in which it coagulates in the presence of acids. Human milk forms into small, light, feathery curds; cow's milk into large, compact, not so easily digested masses. ”

“ When the child is big enough to thrive on undiluted, unmodified cow’s milk, it should not only be allowed, but urged, to continue on a diet in which this, the best of all foods, is the most essential part. An excellent form in which to feed milk to the growing child is junket. Eaten slowly with a spoon as a pudding, it is exposed to the action of digestion much better than milk swallowed by the glassful in a hurry and even if it is cold there is no danger of defective rennet action in the stomach because such action has already taken place. ”

“ In order to modify or “humanize” cow’s milk so as to make its composition nearly the same as that of mother’s milk, simple dilution with water is therefore not sufficient.
There are, however, various other methods which may be used to advantage. For instance, top-milk from a bottle of fresh milk which has stood 4 or 6 hours in ice water will contain 6 to 8% of fat. By diluting this with an equal part of water, the percentage of protein, fat and mineral matter will be about right, and sugar, either cane-sugar or milk-sugar, may be added to supply the carbohydrates. ”

“ When milk is allowed to stand for some time exposed to warmth and air, a spontaneous coagulation occurs, caused by fermentative changes in the sugar of milk, by which it is converted into lactic acid through the action of germs.
Milk is sometimes adulterated by water, the removal of more or less of the cream, or the addition of some foreign substance to increase its density.
The quality of milk is more or less influenced by the food upon which the animal is fed. Watery milk may be produced by feeding a cow upon sloppy food.
The milk of diseased animals should never be used for food. ”

“ The latter is caused by the splitting up of milk sugar and the formation of lactic acid by certain micro-organisms in the milk. When milk is heated, a skin is formed, consisting of coagulated albumin, in which is also a little casein, fat, and salts of lime. Boiled milk becomes sterilized. Cow’s milk should always be boiled, unless it is quite certain that the cows from which it is derived are perfectly healthy, and that the milk has not been exposed to infection before reaching the house. ”

“ For instance, the protein in human milk consists mainly of albumin, while that of cow’s milk is mostly casein. It is often a question whether the individual baby can digest the casein without trouble. A trifle of rennet ferment,—a fraction of a Junket Tablet,—added to the modified cow’s milk just before feeding may be beneficial to overcome that defect. A little limewater also is healthful as it neutralizes any acid that may develop in the mixture. For the particular needs of the individual baby, a competent doctor should be asked to prescribe. ”

“ When we study more carefully the effect upon the milk of the different species of bacteria found in the dairy, we find that there is a great variety of changes which they produce when they are allowed to grow in milk. The dairyman experiences many troubles with his milk. It sometimes curdles without becoming acid. Sometimes it becomes bitter, or acquires an unpleasant "tainted" taste, or, again, a "soapy" taste. Occasionally a dairyman finds his milk becoming slimy, instead of souring and curdling in the normal fashion. ”

“ The reaction of human milk is slightly alkaline; of cow's, neutral or slightly acid. The specific gravity of each is about 1.028 to 1.032. Human milk is sterile when secreted, but derives a few bacteria from the lacteal ducts. Cow's milk, as usually sold, contains large numbers of bacteria. Microscopically, human milk is a fairly homogeneous emulsion of fat, and is practically destitute of cellular elements. ”

“ In addition, sterilized milk is a different article from fresh milk, its chemical composition being altered by the process. The milk of the cow, when ingested, is changed upon encountering the gastric juices, into whey, a liquid, and into a tough mass of curd most difficult of digestion. To call milk a liquid food is absurd, for the solid matter in a pint of milk is equal to that in a half pound of meat, and in its dense coagulated form it is vastly more difficult of digestion. ”

“ If the child had been fed on cow's milk the symptoms may be due to the gastric juice not having been able to dissolve the curd, which you will remember is much firmer than that of human milk as well as twice as abundant. In this case the substitution of asses' milk, the employing whey either entirely or in part instead of milk, and the adding white of egg in order to present the elements of the curd in a more easily digestible form, may all be tried with advantage. Sometimes children refuse whey ”

“ The lesson of practicable importance that we learn from this is that the milk of one of the lower animals is not in its natural state quite suited to the delicate stomach of the growing infant, and that if it be substituted for the mother's milk it must be more or less altered, depending upon the age of the child. It is particularly important that sweet milk be taken slowly, as otherwise large curds, difficult of digestion, form as soon as it gets into the stomach. ”

“ In the hospital or in the home it serves as a substitute for milk when a mild diet of easily digested food is temporarily required for a weak stomach. For such purposes it must not be allowed to become acid as in cheesemaking, but should be prepared as the chief product from sweet new milk or freshly separated skim milk. The sweet milk is set with rennet—one Junket Tablet, dissolved in cold water, to a quart of milk—at a temperature of 90° to 100° F. As soon as a firm curd is formed it is carefully broken up and transferred to a strainer of cheese-cloth. ”

“ It is a matter of great importance that the dairy should not be situated near a pig-stye, sewer, or water-closet, the effluvia from which would be likely to taint the milk. It is surprising how small a quantity of putrescent matter is sufficient to taint a whole churn of milk; and as it has been demonstrated that the almost inappreciable emanations from a cesspool are capable of conferring a bad flavor on milk, it is in the highest degree important to remove from the churn and milk-pail every trace of the sour milk. ”

“ Payne narrates the case of a woman suffering under a nervous affection whose milk, two hours after an attack of the disease, became viscid, like the white of an egg. Similarly, a deterioration and consequent alteration in properties is induced in the milk of the cow if she be over driven, exhausted, or harassed. The food of the animal likewise exercises an influence on the quality of its milk; thus when cows are fed on turnips, wormwood, decayed leaves, and plants of the cabbage or onion families, the flavour of these substances is imparted to their milk. ”

“ MODIFIED MILK.—In case it is necessary to give the infant artificial diet, the greatest care should be taken to provide clean, easily digested food. Cow's milk is the basis of the food generally chosen. The way babies digest cow's milk shows the necessity of changing or modifying it to meet the needs of an infant. Cow's milk is modified sometimes by diluting it to make it digest easier and adding other ingredients to it. In order to increase the fuel value of diluted milk, carbohydrate food of some soluble, easily digested kind is added. ”

“ Cooked milk is not a natural food, but neither are cooked cereals. A combination of raw milk, or cream, and cooked cereals will force the stomach to absorb the milk immediately, while the remainder, poorly masticated and filled with germs, will tend to produce an acid process rather than an alkaline. If sugar is added to raw milk and cereals, the process of intestinal fermentation is complete. ”

“ The diarrhœa infantum, or diarrhœa of infants, is generally owing to too great acidity in their bowels. Milk is found curdled in the stomachs of all animals, old as well as young, and even of carnivorous ones, as of hawks. (Spallanzani.) And it is the gastric juice of the calf, which is employed to curdle milk in the process of making cheese. Milk is the natural food for children, and must curdle in their stomachs previous to digestion ”

“ The other constituent is the enzyme rennin, which clots milk; this property appears to be useful in that clotted milk will not pass the sphincter into the small intestine as quickly as it would if it were liquid, and so the digestive processes can go on in milk after clotting just as it goes on in any other of our foods. Since milk is the chief, and in many cases the only, food of the young it is of course very important that its digestion should be very efficiently carried on. As the food is churned by the stomach muscles, it becomes mixed with gastric juice. ”

“ When acted upon by microörganisms it is changed into glucose, and the glucose is then reduced to lactic acid, the lactic acid being the cause of the milk souring. Milk sugar is found nowhere else in Nature.
SANITARY MEASURES IN PRODUCTION Milk, a Germ Medium
Milk, because of its characteristic qualities, forms a medium in which all kinds of bacteria and germs, or low forms of life, thrive. ”

“ For instance, during the commencement of suckling, the milk is thick and creamy, similar to the biestings of a cow, which, if given to a babe of a few months old, would cause derangement of the stomach and bowels. After the first few days, the appearance of the milk changes; it becomes of a bluish-white color, and contains less nourishment. The milk gradually becomes more and more nourishing as the infant becomes older and requires more support. ”

“ The fact that many, even robust persons, can not use milk at all, and a still larger proportion cream, whereas skimmed milk is well borne by them and in some instances seems to produce lasting good effects, may be accounted for, perhaps, in the following manner: As our cows are bred and fed, their milk is abnormally loaded with fatty matters, and when skimmed, after sitting twelve or more hours, still contains, as compared with natural cows’ milk, a full proportion of cream. ”

“ As has already been said, no food has so far been discovered which could be effectually substituted for milk. There is no food, however, which requires more attention in its selection and care. It is very susceptible to both odors and flavors, absorbing them both readily, as will be found if milk be placed in the same compartment with foods of strong odor and flavor, without being properly covered and protected. ”

“ In modern dairy farming alfalfa is considered an indispensable source for protein, and corn-ensilage or beets for carbohydrates, while bran, cottonseed meal or oil 9cake, malt-sprouts, gluten, distillers’ grain, etc., may be used to advantage in various combinations.
Cows milked with machine
Contrary to a general impression one cannot feed fat into the milk. A large amount of oil cake or other food rich in fat in the daily ration does not increase the percentage of butter-fat in the milk. ”

“ Of course, we all know that wheat grown under certain conditions varies, and, as the climate and soil differ, so does the gluten, as is exampled between comparison with a soft and a strong flour. In the same way it applies to milk. The composition of fat in new milk is determined by the breed, climate, food and health of the cow. A really rich milk would produce as much as 3⁄4 ounce to 1 ounce of fat to the pint, especially just now, when the animals are kept up and fed pretty well. They give less milk, but it is much higher in quality. ”

“ Mixed in the proportion in which they here occur, they are most admirably adapted to the delicate digestive apparatus of the infant—the relative proportion of the different substances even gradually changing as the assimilative powers of the youthful organism increase; it is thus seen that milk itself is not of constant composition, even in the same animal, and that it alters in such a manner as to meet best the needs of the delicate being depending upon it for proper sustenance. ”

“ The liquefied albumen of the egg, and the crude or watery milk of the mammæ seem to have in all respects the same colour, taste, and consistence. For the first flow of milk is serous and watery, and women are wont to express water from their breasts before the milk comes white, concocted, and perfect.
Just as the colliquament found in the crop of the chick is a kind of crude milk, whilst the same fluid discovered in the stomach is concocted, white, and curdled ”

“ Although flesh is a better chemical excitant, it is by no means a matter of indifference how it gets into the stomach. It must, therefore, be accepted that milk excites not only a really effective, but at the same time a very economic, secretion, and also that the appetite is unable to stimulate this secretion into a more active [Pg 274] or abundant flow. The secret of the relation of milk to the secretion of the digestive juices can, unfortunately, at present be submitted to no further analysis or investigation. ”