The Effects of Age upon Calcium Utilization and Maintenance Requirements in the Bovine1

Hansard, Sam L.; Comar, C. L.; Plumlee, M. P.

doi:10.2527/jas1954.13125x

Cited by 100 publications

(29 citation statements)

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“…The results of calcium metabolism obtained in our study are in agreement with the abundant data (13)(14)(15) in experiments reported on the influence of in creasing intakes of dietary calcium upon the utilization of calcium . Thus, high levels of calcium increase the net retention of calcium by the animal but result in a marked reduction in efficiency.…”

Section: Discussionsupporting

confidence: 92%

Effect of Excess Calcium Intake on Absorp-Tion of Nitrogen, Fat, Phosphorus and Calcium in Young Rats. The Use of Organic Calcium Salt

Goto

Sawamura

1973

Journal of Nutritional Science and Vitaminology, J Nutr Sci Vit

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Section: Discussionsupporting

confidence: 92%

Effect of Excess Calcium Intake on Absorp-Tion of Nitrogen, Fat, Phosphorus and Calcium in Young Rats. The Use of Organic Calcium Salt

Goto

Sawamura

1973

Journal of Nutritional Science and Vitaminology, J Nutr Sci Vit

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“…Periods of apparent Ca deficiency were short, and even if the average figure of 22% is considered as a measure of true availability, Ca intake on average exceeded requirements by about one-third. However, Comar et al (1953) and Hansard et al (1954), in isotope dilution studies with Ca, have recorded true availability figures of 40% to 50% for feedstuffs in which this element was apparently between 20% and 30% available, and have shown that percentage availability falls with level of Ca intake; hence for the cows in the present trial the difference between intake and requirement is probably close to that shown in Table 3.…”

Section: Calciumsupporting

confidence: 48%

Studies of the nutritive value of New Zealand dairy pastures

Hutton¹,

Jury²,

Davies³

1967

New Zealand Journal of Agricultural Research

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The results of 89 mineral balance trials are reported, in which the intake and utilisation of potassium, sodium, calcium, phosphorus, and nitrogen have been examined with lactating dairy cows fed exclusively on fresh pasture herbage.Between September 1959 and April 1960 six Jersey crossbred cattle were stall-fed measured quantities of freshly cut herbage. The period covered by the trial extended from approximately the 10th week after calving until the cows were dried off.Excretion of each element was measured by total collection, representative sampling, and analysis of the dung and urine voided and the milk secreted. The mean intake of each element, the amounts voided in the milk, dung, and urine, and the amount of each retained, expressed in g per week, were as follows:- IMean availabilities of each element were: K, 88%; Na, 67%; Ca, 22%; P, 34%; N, 740/". Availability varied markedly between weeks and between animals, variation being greatest for Na and P. To assess the adequacy of the pasture herbages examined as sources of each element, intakes were compared with requirements derived from standard feeding tables. The only evidence of inadequate supply was of P, during a relatively short period in midsummer. Methods of deriving the maintenance requirements of these elements have been compared and discussed, and the results from the present trial are considered particularly in relation to the nature of the herbage fed and the chemical composition of herbages reported in previous studies.

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“…Calcium of milk is virtually all available for absorption (54,84,117,211) but Ca of forage-containing diets seldom has an availability greater than 50% (1,27,33,84,85,117). The addition of grain to an all-forage diet, however, markedly improves the availability of the Ca (52,90).…”

Section: Dietary Factors Affecting the Availability Of Calcium And Phmentioning

confidence: 93%

Calcium and phosphorus metabolism in ruminants with special reference to parturient paresis

Braithwaite¹

1976

Journal of Dairy Research

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CONTENTS Introduction 501 Absorption 502 Sites of absorption 502 Relationship betweon absorption, dietary 502 intake and requirements Mechanism of absorption 502 Control of calcium absorption 503 Dietary factors affecting the availability 504 of calcium and phosphorus Excretion 505 Additional losses in pregnancy and lactation 506 Skeletal metabolism 507 Endocrine regulation of metabolism 508 Role of parathyroid hormone, calcitonin 508 and vitamin D Role of growth hormone and oestrogen 509 Parturient paresis (milk fever) 509 Factors implicated in the development of 509 parturient paresis PAGE Failure of the endocrine control system 509 Calcium content of the diet 510 Decreased intestinal motility at par-510 turition Plasma oestrogen and progesterone con-511 centrations at parturition Stress of parturition 511 Age 511 A working hypothesis of the cause of 512 parturient paresis Prevention of parturient paresis by 512 dietary manipulation The calcium and phosphorus content 512 of the diet Low calcium diets prepartum 512 Acidic diets prepartum 513 Large oral doses of calcium at parturi-514 tion Prepartum administration of vitamin D 614 or its metabolites Feeding and Requirements 515 References 515

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The Effects of Age upon Calcium Utilization and Maintenance Requirements in the Bovine1

Cited by 100 publications

References 0 publications

Effect of Excess Calcium Intake on Absorp-Tion of Nitrogen, Fat, Phosphorus and Calcium in Young Rats. The Use of Organic Calcium Salt

Effect of Excess Calcium Intake on Absorp-Tion of Nitrogen, Fat, Phosphorus and Calcium in Young Rats. The Use of Organic Calcium Salt

Studies of the nutritive value of New Zealand dairy pastures

Calcium and phosphorus metabolism in ruminants with special reference to parturient paresis

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