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<blockquote data-quote="Bright Raven" data-source="post: 1523504" data-attributes="member: 27490"><p>MECHANICAL PROPERTIES OF HOOF HORN, SOLE HAEMORRHAGE AND </p><p>LAMENESS IN DAIRY CATTLE </p><p>by </p><p>BETINA WINKLER </p><p>A thesis submitted to the University of Plymouth in partial fulfilment for the degree of DOCTOR OF PHILOSOPHY </p><p>Department of Biological Sciences </p><p>Faculty of Science </p><p></p><p>July; 2005</p><p></p><p>Page 38:</p><p>The colour of the hoof horn was reported to have an influence over the bruising of the </p><p>horn, with a lower incidence of lameness and less bruising of the sole being found on cows with black hoof pigmentation (Logue et al., 1994). According to Leopold and Prietz (1980), hoof horn with pigmentation presented a lower capacity to absorb water (27.4 vs. 29.0%) and <u>a lower wear rate </u>(38.6 vs. 41.4%) compared to nonpigmented horn. However, Hepbum et al. (2004) reported that <u>non-pigmented claw wall horn in cattle was </u></p><p><u>significantly harder</u> (46.5 vs. 40.3 nearer the coronary line and 68.5 vs. 64.8 away from the coronary line) in areas up to 4.5 cm under the coronary horn when compared to pigmented horn. No difference was measured in the dry matter of these horn samples.</p><p></p><p>Page 86:</p><p>According to Clark and Rakes (1982) <u>hoof horn pigmentation did not affect hoof horn </u></p><p><u>hardness</u>. However, Hepbum et al. (2004) reported that non<u>-pigmented claw wall horn in cattle was significantly harder (46.5 vs. 40.3 nearer the coronary line and 68.5 vs. 64.8 away from the coronary line) in areas up to 4.5 cm under the coronary horn when </u></p><p><u>compared to pigmented horn.</u></p><p></p><p>Page 91:</p><p>No significant difference was obtained between the elastic modulus of pigmented and non-pigmented hoof horn samples of horses (Douglas et al., 1996; Hinterhofer et al., 1998; Ley et al., 1998).</p></blockquote><p></p>
[QUOTE="Bright Raven, post: 1523504, member: 27490"] MECHANICAL PROPERTIES OF HOOF HORN, SOLE HAEMORRHAGE AND LAMENESS IN DAIRY CATTLE by BETINA WINKLER A thesis submitted to the University of Plymouth in partial fulfilment for the degree of DOCTOR OF PHILOSOPHY Department of Biological Sciences Faculty of Science July; 2005 Page 38: The colour of the hoof horn was reported to have an influence over the bruising of the horn, with a lower incidence of lameness and less bruising of the sole being found on cows with black hoof pigmentation (Logue et al., 1994). According to Leopold and Prietz (1980), hoof horn with pigmentation presented a lower capacity to absorb water (27.4 vs. 29.0%) and [u]a lower wear rate [/u](38.6 vs. 41.4%) compared to nonpigmented horn. However, Hepbum et al. (2004) reported that [u]non-pigmented claw wall horn in cattle was significantly harder[/u] (46.5 vs. 40.3 nearer the coronary line and 68.5 vs. 64.8 away from the coronary line) in areas up to 4.5 cm under the coronary horn when compared to pigmented horn. No difference was measured in the dry matter of these horn samples. Page 86: According to Clark and Rakes (1982) [u]hoof horn pigmentation did not affect hoof horn hardness[/u]. However, Hepbum et al. (2004) reported that non[u]-pigmented claw wall horn in cattle was significantly harder (46.5 vs. 40.3 nearer the coronary line and 68.5 vs. 64.8 away from the coronary line) in areas up to 4.5 cm under the coronary horn when compared to pigmented horn.[/u] Page 91: No significant difference was obtained between the elastic modulus of pigmented and non-pigmented hoof horn samples of horses (Douglas et al., 1996; Hinterhofer et al., 1998; Ley et al., 1998). [/QUOTE]
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