Contributions to the Physiology of Phosphorus and Calcium Metabolism as Related to Milk Secretion

Meigs, Edward B.; Blatherwick, N. R.; Cary, C. A.

doi:10.1016/s0021-9258(18)86366-9

Cited by 76 publications

(4 citation statements)

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“…In 1914 she gave 12 For the same reasons as have been given in the case of cow 17, the greatly increased milk yield after the 1918 calving is to be attributed to the more liberal ration fed in the 1918 dry period. It should be mentioned that this cow was milked three times a day during December, 1918, and only twice in the other months above recorded.…”

Section: Discussionmentioning

confidence: 71%

The influence of calcium and phosphorus in the feed on the milk yield of dairy cows /

Meigs¹,

Woodward²

1921

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12 Description of experiments, protocols, and tables 13 Effects, on milk yield, of liberal feeding during dry period 13 Effects, on milk yield, of feeding phosphate with alternated rations during dry period 14 Page. Description of experiments, protocols, and tables --Continued. Rations given animals before calving 18 Condensed history of experimental animals 20 Effects of phosphate feeding ou body weight 23 Quantitative results 24 Grain mixtures used in experiments 25 Account of unsuccessful and incomplete experiments 26 Literature cited 27 DAIRY PRACTICES AT THE GOVERNMENT FARM AT BELTSVILLE. 1Opportunities for observing the effects of the feed on milk secretion have been rather favorable on the dairy experimental farm at Beltsville, Md., where the authors are stationed. Since 1912 a herd of from 50 to 100 cows, some of which are purebred Guernseys, Jerseys, or Holsteins, and some grades, has been maintained here. Daily records have been kept of the milk yields throughout, and yearly records of the feed consumed up to 1918. Since 1918 monthly or daily records of the rations have been kept. The fat in the milk of 1 The authors wish to acknowledge the valuable services of H. J. Nedrow, H. T. Converse, and W. E. Benscoter. Messrs. Nedrow and Converse were the herdsmen at the Beltsville farm during the period when the experiments were carried out, and they supervised the feeding and care of the experimental animals. Mr. Benscoter was responsible for the feeding in a number of cases, and carried out this part of the work with unusual care and accuracy. 27763°-21 1 2 BULLETIN 945, U. S. DEPARTMENT OF AGRICULTURE. meal, linseed meal, alfalfa and other legume hays, and corn silag® and stover. Most of the cows have had a little pasture in the summer, but not enough to make up any considerable proportion of the total amount of feed eaten in the year.The aim has been to feed the cows as much protein as is required by the most liberal of the American feeding standards, to keep them in good condition, to have them calve once a year, and to have them dry each year for 6 to 8 weeks before calving. It has generally happened in practice that the cows were fed a little less liberally than is demanded by the Savage and Eckles standards (9) 2 for the first two or three months after calving, and a little more liberally later.When they were dry they were usually fed 4 pounds of grain mixture B, 3 4 pounds of legume hay, and as much silage as they would clean up. When the hay was alfalfa and the amount of silage eaten daily 30 pounds, which was the most usual state of things, this ration provided 1.29 pounds of digestible crude protein and 10.29 pounds of total digestible nutriment daily. After subtracting the maintenance requirement for a 1,000-pound cow, this would allow 0.59 pound protein and 2.37 pounds total nutriment daily for the growth of the unborn calf, which, according to the results obtained by Eckles (3), ought to be sufficient.We have recently calculated the protein and total nutriment in the yearly rations of a number o...

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Section: Discussionmentioning

confidence: 71%

The influence of calcium and phosphorus in the feed on the milk yield of dairy cows /

Meigs¹,

Woodward²

1921

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“…The influence of the war on higher education is strik¬ ingly shown by the number of Ph.D. degrees granted by American universities since 1916, for this fell off as the size of the American army increased (1917, 372; 1918, 293; 1919, 180). This is a confirmation of the DOCTORATES DISTRIBUTED ACCORDING TO SCIENCES 191219131914191519161917191819191920 acknowledged fact that the scientific men of the coun¬ try played an increasingly important part in the activi¬ ties of the army and navy. In 1921 there were 332 doctorates conferred in the natural sciences by thirtytwo institutions, as compared with 323 by the same number of institutions in 1920.…”

Section: Current Comment the Doctorate Of Philosophy In Sciences Related To Medicinementioning

confidence: 73%

Milk Secretion and Diet

1922

JAMA

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The red corpuscles, likewise, take part in maintaining neutrality. Although there are no authentic reports of movement of basic ions into or out of the red cells, numerous investigators have shown that there is a migration of acid ions from the plasma into the erythrocytes under conditions of increased acidity such as occurs with higher concentrations of carbon dioxid. The wandering acid ion thus leaves the molecular equivalent of base free in the plasma to combine with the invading acid. There are, therefore, the phosphate and protein systems, which belong strictly to the plasma, and the corpuscle-carbonate system, which may be said to be lent to the fluid portion of the blood.

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“…The evidence regarding the phospholipides as intermediary compounds in the utilization of the fats is, first, the universal presence of these compounds in living tissues and organs, second, the increase of lipide phosphorus in the blood during fat absorption when the blood contains much extra fat (alimentary lipemia) (138) (97), third, the increased values for lipide phosphorus in lipemia of other origins (139), and fourth, evidence of formation of milk fat from phospholipide of blood. Meigs, Blatherwick and Cary (140), workers were able to show as a result of the analysis of the blood before and after passing through the milk gland of the cow, that the fat of milk originated mainly if not entirely in the phospholipide of the blood. In work reported at an earlier date Jordan, Hart and Patten found in cows that a diet low in phosphorus resulted in a lower milk fat production than when the phosphorus supply was adequate.…”

Section: The Fatty Acidsmentioning

confidence: 99%