Bokt.nl

[***] schreef:

Biotine werkt alleen als een paard ook daadwerkelijk daar tekort aan heeft. Maar dan is de vacht ook niet mooi. Biotine doen veel voerleveranciers ook standaard door de brok, een echt tekort is zeldzaam.

Citaat:

Schweiz Arch Tierheilkd. 1994;136(4):137-49.


The long-term influence of biotin supplementation on hoof horn quality in horses.
Geyer H, Schulze J.

Institute of Veterinary Anatomy, University of Zurich.

The influence of dietary biotin in horses with brittle hoof horn and chipped hooves was investigated in a long-term study, which was performed over a period from one to six years. 97 horses received 5 mg of biotin per 100 to 150 kg of body weight, per os, daily; 11 horses were not supplemented with biotin and served as controls. The hooves of all horses were evaluated macroscopically every three to four months. Hoof horn specimens of the proximal wall were examined histologically and physically in 25 and 15 horses, respectively. The tensile strength of normal coronary horn was 60 N/mm2 or greater; it was reduced in areas of histological alterations, the lowest value being 20 N/mm2. The hoof horn condition of the biotin-supplemented horses improved after eight to 15 months of supplementation as determined by macroscopic and histologic examinations. The hoof horn condition of most control horses remained constant throughout the study. The growth rate of the coronary horn of horses supplemented with biotin and of control horses was the same. The hoof horn condition deteriorated in 7 of 10 horses after biotin supplementation was reduced or terminated.
It was concluded that biotin should be continuously supplemented at the full dosage in horses with severe hoof horn alterations.
PMID: 8202678 [PubMed - indexed for MEDLINE]

Citaat:

Equine Vet J. 1995 May;27(3):175-82.
Comment in:
Equine Vet J. 1995 May;27(3):166-8.


Hoof horn abnormalities in Lipizzaner horses and the effect of dietary biotin on macroscopic aspects of hoof horn quality.

Josseck H, Zenker W, Geyer H.

Institute of Veterinary Anatomy, University of Zurich, Switzerland.

This study involved a macroscopic evaluation of hoof quality in 152 Lipizzaner horses (130 from Austria and 22 from other countries) and a controlled double blind trial of the effects of biotin on hoof horn growth and quality over 19 months in 42 stallions from the Spanish Riding School (SRS) in Vienna. Using a grading system that incorporated evaluation of horn wall, white line, sole and frog, the macroscopic study revealed the following: 90% of the Austrian Lipizzaners had soft white lines and crumbling, fissured horn at the bearing border of the walls; 39% of the stallions of the SRS, > 4-years-old, had medium to severe hoof horn changes. Daily administration of 20 mg biotin to a test group of horses (n = 26) and a placebo to a control group (n = 16) showed that after 9 months the test group had significantly improved compared to the beginning of the trial and the placebo group (P < 0.01). In the test group, further improvement was observed during the following 5 months and, subsequently, the same good level of hoof condition was maintained over 3 further years of observation. Growth rate of the horn wall was equal in the biotin and placebo group, being 7 mm/28 days, giving a wall renewal period of 11 months. Mean plasma biotin level of untreated horses was 350 ng/l; plasma levels of biotin supplemented horses were > 1000 ng/l.
It was concluded that continuous dietary supplementation with biotin at a daily dose of 20 mg is indicated to improve and maintain hoof horn quality in horses with less than optimum quality hoof.
Publication Types:
Clinical Trial
Randomized Controlled Trial

PMID: 7556044 [PubMed - indexed for MEDLINE]

Citaat:

Equine Vet J. 1992 Nov;24(6):472-4.


Effect of dietary biotin supplement on equine hoof horn growth rate and hardness.

Buffa EA, Van Den Berg SS, Verstraete FJ, Swart NG.

Department of Surgery, Faculty of Veterinary Science, Onderstepoort, Republic of South Africa.

Over a 10-month period, 24 randomly selected riding horses were fed various amounts of biotin.
Statistically significant improvements in growth rates and hardness of hooves were produced by biotin supplementation. Greater growth rates and hardness were achieved at a daily dose of 15 mg than at 7.5 mg
. Increased hoof hardness was greatest in the hoof quarters and toe. No ring formation occurred in hooves of horses fed biotin intermittently.

PMID: 1459062 [PubMed - indexed for MEDLINE]

Citaat:

Equine Vet J Suppl. 1998 Sep;(26):51-7.


Effect of supplementary dietary biotin on hoof growth and hoof growth rate in ponies: a controlled trial.

Reilly JD, Cottrell DF, Martin RJ, Cuddeford DJ.

Department of Preclinical Veterinary Sciences, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Summerhall, UK.

The effect of dietary biotin supplementation, at a dose rate of 0.12 mg/kg bwt, on growth and growth rate of the hooves of 8 match-paired poines was investigated in a controlled feeding trial.
Treatment animals had a mean hoof growth at the midline dead centre of the hoof capsule of 35.34 mm after 5 months of biotin supplementation compared to control animals 30.69 mm (P < 0.05). Comparison of regression analysis also showed that biotin supplementation produced a significantly higher (P < 0.02) growth rate of hoof horn in this trial. Treatment animals had a 15% higher growth rate of hoof horn and 15% more hoof growth at the midline dead centre, after 5 months of biotin supplementation compared to control ponies.
No differences were found between feet for growth of horn, but the older animals in the trial had significantly lower hoof growth (P < 0.05) than the remaining poines.

Publication Types:
Clinical Trial
Randomized Controlled Trial

PMID: 9932094 [PubMed - indexed for MEDLINE]