Quelques facteurs de variation de la teneur en calcium des laits de vaches

Auriol, P.; Mocquot, G.

doi:10.1017/s0022029900017799

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…Of the four elements to be discussed in this paper, the content of potassium in milk decreases and that of sodium increases as stage of lactation increases (6, t4). Calcium (1,9) and magnesium contents (9) decline during the early stages of lactation and increase in late lactation. Vanschoubroek (16) suggested that these seasonal or lactational changes in the concentration of minerals in milk also correspond to major dietary changes such as the rotation of stall feeding and pasture grazing.…”

Section: Introductionmentioning

confidence: 99%

EFFECTS OF AD LIBITUM VERSUS RESTRICTED INTAKE OF CONCENTRATE AND STAGE OF LACTATION ON THE MINERAL CONTENT OF COW’S MILK

Fisher¹,

Macintosh²,

Carson³

1970

Can. J. Anim. Sci.

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Concentrates, one consisting primarily of oats The calcium content of milk was significantly and the other barley, were fed ad libitum to greater (P < 0.05) when the barley-based cows or at the rate of I kg per 3 kg of milk compared with the oat-based concentrate was yield for an entire lactation. Calcium, potas-fed. The sodium content of milk from cows sium, magnesium and sodium content of the fed concentrate ad libitum was sipificantly milk and milk yield were measured monthly. higher than from cows fed restricted amounts Potassium conti:nt and milk yield decreased of concentrate, Ayrshire milk was signifiand sodium content increased significantly cantly greater (P < 0.05) in magnesium con-(P < 0.05) with advancing stage of lactation. centration than Holstein milk.

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Section: Introductionmentioning

confidence: 99%

EFFECTS OF AD LIBITUM VERSUS RESTRICTED INTAKE OF CONCENTRATE AND STAGE OF LACTATION ON THE MINERAL CONTENT OF COW’S MILK

Fisher¹,

Macintosh²,

Carson³

1970

Can. J. Anim. Sci.

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“…Auriol and Mocquot () reported that levels of total calcium decreased during the first month of lactation and increased significantly during the last 3 months. Kamal et al .…”

Section: Physiological Factors Affecting the Composition Of Bovine Milkmentioning

confidence: 99%

Best use for milk – A review.II– Effect of physiological, husbandry and seasonal factors on the physicochemical properties of bovine milk

Chen

Grandison

Lewis

2017

Int J of Dairy Tech

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Part two of this review evaluates the impact of physiological, husbandry and seasonal factors on the physicochemical properties of raw bovine milk and on products manufactured from it. For producers of dairy products, there are opportunities to select the most appropriate feeding regimes for producing raw milk which is optimal for their products, as well as understanding what are the best products to be made from milk produced at different times of the year. For these reasons, the concept of 'best use' for milk will become an exciting and profitable area for study.

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Chemical composition and coagulating properties of renneted milks from cows during early lactation

Grandison

Ford

Millard

et al. 1984

Journal of Dairy Research

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The detailed composition, pH, and the properties of rennet clotting, coagulum development and syneresis at pH 6-4 were estimated in milks from 4 Friesian cows during the first 9 weeks of lactation. The concentrations of casein, fat, citrate, Ca, Mg, Pj and Na decreased significantly during early lactation whilst the pH and concentration of lactose increased. Levels of whey protein and K and the casein:fat ratio were unaltered. Considerable variation occurred in the relative proportions of a s -, yff-and /c-casein. These changes in composition were associated with decreasing coagulum strength and an increased rate of whey drainage although rennet clotting time (RCT) did not follow a significant trend. RCT was positively related to levels of Na and whey protein but negatively correlated with Pj, K and lactose. There were significant positive correlations between coagulum strength and casein, fat, nonprotein nitrogen, P 4 , Ca, Mg and citrate. The correlation with a s -casein was stronger than that with /?-or /c-casein. Syneresis time was positively related to fat, Ca and coagulum strength, but negatively related to the concentration of lactose.Seasonal changes in milk composition give rise to unfavourable variations in the yield and quality of dairy products. Feeding, stage of lactation and breeding are the major controllable factors which affect milk composition. Recent studies on milks from different breeds and species of ruminant (Storry et al. 1983) and from Friesian herd milks during the change from winter rations to spring grazing (Grandison et al. 1984) have demonstrated that the coagulation of milk by rennet is radically affected by milk composition. In the latter report and the present study we have attempted to assess individually the effects of nutritional changes and stage of lactation on the composition and rennet coagulating properties of milk. Previous reports (e.g. Chapman & Burnett, 1972;O'Keeffe et al. 1982) have described the variation in composition and properties of milk with season but have not dissociated the effects of nutrition and lactation.The present paper describes studies of the detailed composition and rennet coagulation properties of milks from four Friesian cows during the first 9 weeks of lactation.

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Quelques facteurs de variation de la teneur en calcium des laits de vaches

Cited by 5 publications

References 9 publications

EFFECTS OF AD LIBITUM VERSUS RESTRICTED INTAKE OF CONCENTRATE AND STAGE OF LACTATION ON THE MINERAL CONTENT OF COW’S MILK

EFFECTS OF AD LIBITUM VERSUS RESTRICTED INTAKE OF CONCENTRATE AND STAGE OF LACTATION ON THE MINERAL CONTENT OF COW’S MILK

Best use for milk – A review.II– Effect of physiological, husbandry and seasonal factors on the physicochemical properties of bovine milk

Chemical composition and coagulating properties of renneted milks from cows during early lactation

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