Magnesium aspartate supplementation and reaction speed response in horses

Jessica Dodd, Gregory Doran, P. Harris, Glenys Noble

Research output: Contribution to journalMeeting Abstract

Abstract

Magnesium (Mg) containing supplements and feeds typically claim, among many things, to have a calmative effect on horse behavior without any published evidence for such an effect. The aim of this study was to investigate if oral Mg supplementation above NRC recommendations increases the Mg status in the horse and has an observable effect on horse behavior. Six mature Standardbred geldings were used. Prior to Mg supplementation, all horses had their reaction speed recorded with and without mild sedation (0.04 mg/kg BW Acepromazine) using a random cross over design. Horses were then allocated a treatment using a Latin square design with each horse acting as its own control. All horses were fed a base (control) ration comprising low energy pellets (Cool Conditioner, CopRice, Leeton, Australia) plusclover/ryegrass hay fed at 2.0% BW (total mean Mg of ration: 11.2± 2.0 g). Three treatments were used in the trial: control ration, control plus 2.5 g added Mg (as magnesium aspartate) and control plus 10 g added Mg. Horses were fed each ration in 2 meals per day for a period of 7 d. All horses were kept in individual dry lots that allowed free exercise. On Day 6, a series of blood and urine samples were collected over 24 h to determine Mg status and excretion. On Day 7, each horse underwent a reaction speed test. This measured the time taken for a horse to cover 2 m in a custom-built chute after being startled. Repeated measures ANOVA of blood and urine concentrations at allocated sampling times showed an increase in total blood Mg concentrations and urinary Mg excretion between the control group and the Mg supplemented groups. There was a trend for Mg supplementation to decrease reaction speed (P ¼ 0.07) when the control was compared with both the 2.5 g and 10 g added Mggroups. There was a significant difference shown between the control and 10 g added Mg treatment (P ¼ 0.025) using a paired Students t-test. Mean reaction speed (±SD) was Control, 5.3 ± 2.2m/s; 2.5 g added Mg, 3.7 ± 1.8 m/s and 10 g added Mg, 3.1 ± 1.5m/s, with no effect of day. This was comparable to the pre-study testing where unsedated horses had a mean reaction speed of 5.3 ± 1.8 m/s compared with 3.5 ± 1.5 m/sec when sedated. This is the first time an objective measurement of behavioral change due to oral magnesium supplementation has been reported in the horse.
Original languageEnglish
Pages (from-to)401-402
Number of pages2
JournalJournal of Equine Veterinary Science
Volume35
Issue number5
DOIs
Publication statusPublished - May 2015

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aspartic acid
Aspartic Acid
Magnesium
Horses
magnesium
horses
mouth
blood
Acepromazine
urine
excretion
Urine
chutes
Lolium
acepromazine
Standardbred
feed rations
geldings
sedation
Cross-Over Studies

Cite this

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title = "Magnesium aspartate supplementation and reaction speed response in horses",
abstract = "Magnesium (Mg) containing supplements and feeds typically claim, among many things, to have a calmative effect on horse behavior without any published evidence for such an effect. The aim of this study was to investigate if oral Mg supplementation above NRC recommendations increases the Mg status in the horse and has an observable effect on horse behavior. Six mature Standardbred geldings were used. Prior to Mg supplementation, all horses had their reaction speed recorded with and without mild sedation (0.04 mg/kg BW Acepromazine) using a random cross over design. Horses were then allocated a treatment using a Latin square design with each horse acting as its own control. All horses were fed a base (control) ration comprising low energy pellets (Cool Conditioner, CopRice, Leeton, Australia) plusclover/ryegrass hay fed at 2.0{\%} BW (total mean Mg of ration: 11.2± 2.0 g). Three treatments were used in the trial: control ration, control plus 2.5 g added Mg (as magnesium aspartate) and control plus 10 g added Mg. Horses were fed each ration in 2 meals per day for a period of 7 d. All horses were kept in individual dry lots that allowed free exercise. On Day 6, a series of blood and urine samples were collected over 24 h to determine Mg status and excretion. On Day 7, each horse underwent a reaction speed test. This measured the time taken for a horse to cover 2 m in a custom-built chute after being startled. Repeated measures ANOVA of blood and urine concentrations at allocated sampling times showed an increase in total blood Mg concentrations and urinary Mg excretion between the control group and the Mg supplemented groups. There was a trend for Mg supplementation to decrease reaction speed (P ¼ 0.07) when the control was compared with both the 2.5 g and 10 g added Mggroups. There was a significant difference shown between the control and 10 g added Mg treatment (P ¼ 0.025) using a paired Students t-test. Mean reaction speed (±SD) was Control, 5.3 ± 2.2m/s; 2.5 g added Mg, 3.7 ± 1.8 m/s and 10 g added Mg, 3.1 ± 1.5m/s, with no effect of day. This was comparable to the pre-study testing where unsedated horses had a mean reaction speed of 5.3 ± 1.8 m/s compared with 3.5 ± 1.5 m/sec when sedated. This is the first time an objective measurement of behavioral change due to oral magnesium supplementation has been reported in the horse.",
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author = "Jessica Dodd and Gregory Doran and P. Harris and Glenys Noble",
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Magnesium aspartate supplementation and reaction speed response in horses. / Dodd, Jessica; Doran, Gregory; Harris, P.; Noble, Glenys.

In: Journal of Equine Veterinary Science, Vol. 35, No. 5, 05.2015, p. 401-402.

Research output: Contribution to journalMeeting Abstract

TY - JOUR

T1 - Magnesium aspartate supplementation and reaction speed response in horses

AU - Dodd, Jessica

AU - Doran, Gregory

AU - Harris, P.

AU - Noble, Glenys

N1 - Imported on 12 Apr 2017 - DigiTool details were: month (773h) = May; Journal title (773t) = Journal of Equine Veterinary Science. ISSNs: 0737-0806; Proceedings of the 2015 Equine Science Society Symposium

PY - 2015/5

Y1 - 2015/5

N2 - Magnesium (Mg) containing supplements and feeds typically claim, among many things, to have a calmative effect on horse behavior without any published evidence for such an effect. The aim of this study was to investigate if oral Mg supplementation above NRC recommendations increases the Mg status in the horse and has an observable effect on horse behavior. Six mature Standardbred geldings were used. Prior to Mg supplementation, all horses had their reaction speed recorded with and without mild sedation (0.04 mg/kg BW Acepromazine) using a random cross over design. Horses were then allocated a treatment using a Latin square design with each horse acting as its own control. All horses were fed a base (control) ration comprising low energy pellets (Cool Conditioner, CopRice, Leeton, Australia) plusclover/ryegrass hay fed at 2.0% BW (total mean Mg of ration: 11.2± 2.0 g). Three treatments were used in the trial: control ration, control plus 2.5 g added Mg (as magnesium aspartate) and control plus 10 g added Mg. Horses were fed each ration in 2 meals per day for a period of 7 d. All horses were kept in individual dry lots that allowed free exercise. On Day 6, a series of blood and urine samples were collected over 24 h to determine Mg status and excretion. On Day 7, each horse underwent a reaction speed test. This measured the time taken for a horse to cover 2 m in a custom-built chute after being startled. Repeated measures ANOVA of blood and urine concentrations at allocated sampling times showed an increase in total blood Mg concentrations and urinary Mg excretion between the control group and the Mg supplemented groups. There was a trend for Mg supplementation to decrease reaction speed (P ¼ 0.07) when the control was compared with both the 2.5 g and 10 g added Mggroups. There was a significant difference shown between the control and 10 g added Mg treatment (P ¼ 0.025) using a paired Students t-test. Mean reaction speed (±SD) was Control, 5.3 ± 2.2m/s; 2.5 g added Mg, 3.7 ± 1.8 m/s and 10 g added Mg, 3.1 ± 1.5m/s, with no effect of day. This was comparable to the pre-study testing where unsedated horses had a mean reaction speed of 5.3 ± 1.8 m/s compared with 3.5 ± 1.5 m/sec when sedated. This is the first time an objective measurement of behavioral change due to oral magnesium supplementation has been reported in the horse.

AB - Magnesium (Mg) containing supplements and feeds typically claim, among many things, to have a calmative effect on horse behavior without any published evidence for such an effect. The aim of this study was to investigate if oral Mg supplementation above NRC recommendations increases the Mg status in the horse and has an observable effect on horse behavior. Six mature Standardbred geldings were used. Prior to Mg supplementation, all horses had their reaction speed recorded with and without mild sedation (0.04 mg/kg BW Acepromazine) using a random cross over design. Horses were then allocated a treatment using a Latin square design with each horse acting as its own control. All horses were fed a base (control) ration comprising low energy pellets (Cool Conditioner, CopRice, Leeton, Australia) plusclover/ryegrass hay fed at 2.0% BW (total mean Mg of ration: 11.2± 2.0 g). Three treatments were used in the trial: control ration, control plus 2.5 g added Mg (as magnesium aspartate) and control plus 10 g added Mg. Horses were fed each ration in 2 meals per day for a period of 7 d. All horses were kept in individual dry lots that allowed free exercise. On Day 6, a series of blood and urine samples were collected over 24 h to determine Mg status and excretion. On Day 7, each horse underwent a reaction speed test. This measured the time taken for a horse to cover 2 m in a custom-built chute after being startled. Repeated measures ANOVA of blood and urine concentrations at allocated sampling times showed an increase in total blood Mg concentrations and urinary Mg excretion between the control group and the Mg supplemented groups. There was a trend for Mg supplementation to decrease reaction speed (P ¼ 0.07) when the control was compared with both the 2.5 g and 10 g added Mggroups. There was a significant difference shown between the control and 10 g added Mg treatment (P ¼ 0.025) using a paired Students t-test. Mean reaction speed (±SD) was Control, 5.3 ± 2.2m/s; 2.5 g added Mg, 3.7 ± 1.8 m/s and 10 g added Mg, 3.1 ± 1.5m/s, with no effect of day. This was comparable to the pre-study testing where unsedated horses had a mean reaction speed of 5.3 ± 1.8 m/s compared with 3.5 ± 1.5 m/sec when sedated. This is the first time an objective measurement of behavioral change due to oral magnesium supplementation has been reported in the horse.

KW - Behavior

KW - Equine

KW - Magnesium

U2 - 10.1016/j.jevs.2015.03.051

DO - 10.1016/j.jevs.2015.03.051

M3 - Meeting Abstract

VL - 35

SP - 401

EP - 402

JO - Journal of Equine Veterinary Science

JF - Journal of Equine Veterinary Science

SN - 0737-0806

IS - 5

ER -