Influence of a deficient supply of magnesium during the dry period on the rate of calcium mobilisation by dairy cows at parturition

Braak, A.E. van de; Klooster, Astrid; Malestein, A.

doi:10.1016/s0034-5288(18)30663-5

Cited by 46 publications

(18 citation statements)

References 21 publications

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“…It has been observed that PTH secretion and the sensitivity of its receptors decrease when serum Mg is below 0.65 mmol/l ( Van de Braak et al, 1986). Serum Mg values were between 0.7 and 1.05 mmol/l in this study, perhaps allowing a better affinity of PTH receptors to the ligand and an adequate physiological response to hypocalcemia.…”

Section: Discussionmentioning

confidence: 46%

Metabolites of vitamin D and minerals in blood and colostrum of primiparous and multiparous dairy cows postpartum

Salgado-Hernández¹,

Bouda²,

Godoy³

et al. 2014

CZECH J ANIM SCI

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Concentrations of calcidiol, calcitriol, and minerals in blood serum and colostrum of 14 primiparous and 16 multiparous Holstein dairy cows during short-period prepartum and postpartum were determined and compared. Blood samples were collected between days 5 and 2 prepartum and 6 h, 12 h, 7 and 21 days postpartum. Nearly 66% of primiparous and 71% of multiparous cows had subclinical postpartum hypocalcemia. Prepartum serum calcium (Ca) and inorganic phosphorus (P) were higher in primiparous cows; Ca decreased in both groups at 6 and 12 h and returned to baseline values 7 days postpartum. Calcidiol and calcitriol concentrations were equal on day 5 prepartum in both groups. In multiparous cows, calcidiol and calcitriol concentration increased at 6 h postpartum and remained elevated at 12 h postpartum; there were no changes in primiparous cows for these analytes. The total secretion of Ca in the colostrum from the first milking was similar in both groups and positively correlated with serum Ca at 6 and 12 h after calving. It is concluded that postpartum increases in the calcidiol and calcitriol concentration were a normal response to the decrease of serum calcium concentration only in multiparous cows. The total Ca secretion in the colostrum of the first milking postpartum does not reflect the grade of hypocalcemia.

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Section: Discussionmentioning

confidence: 46%

Metabolites of vitamin D and minerals in blood and colostrum of primiparous and multiparous dairy cows postpartum

Salgado-Hernández¹,

Bouda²,

Godoy³

et al. 2014

CZECH J ANIM SCI

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“…Similarly, Lean et al (2006) showed that an increase in dietary Mg substantially reduced the risk of developing milk fever. Because of the effect of Mg on the excretion and effect of parathyroid hormone, cows suffering from hypomagnesaemia may have impaired Ca homeostatic mechanisms, and Van de Braak et al (1987) showed that low Mg intake during the dry period reduced the ability of the cow to mobilise Ca at parturition. However, more than 80% of the present herds that belonged to the lowest third in Mg intake received Mg at rates above the current Nordic recommendation (Nielsen and Volden, 2011), and the NRC (NRC, 2001) recommendations and the former Swedish recommendations (Spö rndly, 2003) recommend even lower levels of Mg.…”

Section: Discussionmentioning

confidence: 99%

Relationship between incidence of milk fever and feeding of minerals during the last 3 weeks of gestation

Kronqvist

Emanuelson

Tråvén

et al. 2012

Animal

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This study evaluated whether differences in milk fever incidence among Swedish dairy herds could be explained partly by differences in mineral feeding during the last weeks of gestation. A case-control study was performed on dietary risk factors for a high incidence of milk fever at the herd level using information regarding feeding and management of the dry cows collected in a written questionnaire distributed by post in spring 2008. The study was conducted from September 2004 to August 2007. Data on the diets fed to dry cows, with an emphasis on the amounts of minerals (Ca, P, Mg and K) fed 3 weeks before calving and at calving, were obtained from 30 herds belonging to the 100 Swedish herds with the highest recorded incidence of veterinary treatment for milk fever (>8.8%) and from 22 herds with no recorded milk fever treatments. Multivariable logistic regression analysis showed that a linear increase in the total amount of K and less than 26 g of Mg/day fed to dry cows 3 weeks before calving was associated with an increased risk of high milk fever incidence. A large increase in the amount of dry matter (DM) fed (>3.1 kg DM extra per day at calving compared with 3 weeks before calving) was associated with a higher incidence of milk fever, but no differences were found for Ca or P intake. Breed composition, herd average milk yield and age composition of the herd did not explain any of the observed differences between the case and the control herds. The results indicate that differences in the frequency of milk fever among herds can be associated with differences in mineral feeding of the dry cows. A high amount of K in the diet may increase the risk of milk fever linearly, whereas Mg should probably be fed at a higher level than the current Nordic recommendation to prevent milk fever.

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“…Según Contreras (2002 b), si el descenso es intenso, debido a una incapacidad de movilización de Ca desde las reservas óseas, se podría producir paresia puerperal hipocalcémica.No se registraron signos clínicos de esta enfermedad si bien hubo hipocalcemia. Van de Braak et al (1987) sostienen que concentraciones de Mg por debajo de 0,65 mmol/L en vacas en preparto incrementan la susceptibilidad a padecer hipocalcemia. Como ya se indicó, las concentraciones de Mg nunca estuvieron por debajo de ese valor lo cual podría explicar la falta de signos clínicos de paresia puerperal, a pesar de los bajos niveles de Ca observados en algunos casos.…”

Section: Mgunclassified

Efecto de la suplementación con Mg sobre diversos parámetros en vacas con restricción alimentaria

et al. 2012

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Bovine. Hypomagnesemia. Mineral supplementation. Nutritional restriction. RESUMENSe evaluó el efecto de la suplementación oral con Mg sobre la concentración intra y extracelular de macroelementos en vacas de cría con restricción nutricional durante el último tercio de gestación y 45 días posparto y determinar su influencia sobre parámetros bioquímicos y el estado clínico y productivo de los animales.Se utilizaron tres grupos de 15 vacas Abeerden Angus, preñadas. El grupo 1 fue suplementado con óxido de magnesio con libre acceso a una pastura de agropiro y festuca; el grupo 2 no recibió suplementación mineral y tuvo acceso a las pasturas; en el grupo 3, los animales fueron sometidos a restricción alimentaria en el preparto, con acceso sólo a heno de agropiro. Se realizaron 6 muestreos de sangre, forraje y uno de agua de bebida. En suero sanguíneo, eritrocitos y forraje se midió Mg, Ca, Na y K por espectrofotometría de absorción atómica. En suero y pasto P por colorimetría. En agua Ca, Mg, Na por espectrofotometría de absorción atómica y sales totales por gravimetría. Los datos fueron analizados mediante ANOVA y comparados por el test de Duncan para cada grupo según muestreos. Las concentraciones de Mg en las pasturas y en heno fueron inferiores al 0,20% sobre materia seca. No existieron diferencias significativas en los valores del Mg sérico entre los 3 grupos de animales si bien el grupo 1 presentó valores más elevados. La concentración de Mg intracelular fue menor que la del extracelular en todos los grupos y durante el posparto se observó un aumento de los valores de Mg eritrocitario en todos los animales. Durante el último muestreo, los animales de los grupos 1 y 2 mantenían una condición corporal de 6 mientras que los del grupo 3 tenían una condición de 4. Los animales de los grupos 1 y 2 ganaron 26 y 16 kg respectivamente, mientras que los del grupo 3 perdieron 44 kg. Los porcentajes de destete fueron de 93,3% para los grupos 1 y 2 y 66,6% para el grupo 3. El peso al nacer de los terneros del grupo 3 fue de 4 kg menos que el de los grupos 1 y 2 (p<0,05). La caída de Mg sérico fue más rápida que la del eritrocitario por lo que es mejor indicador para detectar la deficiencia de Mg. Si bien, no se observaron diferencias significativas entre los parámetros bioquímicos analizados, el grupo de animales bajo restricción alimentaria tuvo mayores pérdidas productivas que los animales sin restricción. Aunque no se observaron signos clínicos vinculantes a la hipomagnesemia en los animales en restricción este tipo de manejo alimenticio puede predisponer a pérdidas productivas que deberán ser evaluadas al momento de definir dicha estrategia.# El presente trabajo se financió con fondos provenientes del LBCV a través del Servicio de Diagnóstico Veterinario Especializado del INTA de Balcarce.

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Influence of a deficient supply of magnesium during the dry period on the rate of calcium mobilisation by dairy cows at parturition

Cited by 46 publications

References 21 publications

Metabolites of vitamin D and minerals in blood and colostrum of primiparous and multiparous dairy cows postpartum

Metabolites of vitamin D and minerals in blood and colostrum of primiparous and multiparous dairy cows postpartum

Relationship between incidence of milk fever and feeding of minerals during the last 3 weeks of gestation

Efecto de la suplementación con Mg sobre diversos parámetros en vacas con restricción alimentaria

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