Smilie R H, Hoblet K H, Weiss W P, Eastridge M L, Rings D M, Schnitkey G L
Department of Veterinary Clinical Sciences, Ohio State University, Columbus 43210-1092, USA.
J Am Vet Med Assoc. 1996 May 1;208(9):1445-51.
To determine prevalence of lesions associated with subclinical laminitis in first-lactation Holstein cows during early lactation and pregnant Holstein heifers during late gestation in herds with high milk production.
Cross-sectional study.
203 cattle in 13 herbs.
Cattle were placed in lateral recumbency to allow visual examination and photography of their hooves. Claws on a forelimb and hind limb were examined on all cattle. Observable categories of lesions considered to be associated with subclinical laminitis in our study included yellow waxy discoloration of the sole, hemorrhage of the sole, separation of the white line, and erosion of the heel.
Lesions in at least 1 of the categories were found in all herds. Lesions in all categories were found in 11 of 13 herds. Among claws, hemorrhage of the sole was observed most frequently in the lateral claw of the hoof of the hind limb. When days in milk was treated as a covariate, significant (P < 0.01) differences were detected in the prevalence of lesions between herds.
Because the prevalence of lesions differed significantly among herds, it is logical to believe that causative factors and corrective measures also may have differed among herds.
确定高产奶牛场头胎泌乳早期的荷斯坦奶牛以及妊娠后期的荷斯坦怀孕小母牛中亚临床蹄叶炎相关病变的患病率。
横断面研究。
13个牛群中的203头牛。
将牛侧卧以便对其蹄部进行目视检查和拍照。对所有牛的前肢和后肢的蹄爪进行检查。在我们的研究中，被认为与亚临床蹄叶炎相关的可观察到的病变类别包括蹄底黄色蜡样变色、蹄底出血、白线分离和蹄踵糜烂。
在所有牛群中均发现至少一类病变。13个牛群中有11个牛群发现了所有类别的病变。在蹄爪中，后肢蹄外侧爪的蹄底出血最为常见。将泌乳天数作为协变量处理时，各牛群间病变患病率存在显著（P < 0.01）差异。
由于各牛群间病变患病率差异显著，因此有理由认为致病因素和纠正措施在各牛群间也可能不同。
