Azarpajouh S, Marchewka J, Segura Correa J C, Calderón Díaz J A
Department of Clinical Science, Shahrekord College of Veterinary Medicine, Shahrekord, Iran.
Department of Animal Science, Iowa State University, Ames, IA, 50010, USA.
Trop Anim Health Prod. 2018 Aug;50(6):1343-1348. doi: 10.1007/s11250-018-1566-y. Epub 2018 Mar 11.
The objective of this study was to compare hoof anatomy, hoof growth pattern, and hoof weight-bearing surface of six different Iranian sheep breeds to identify possible differences in the hoof anatomical features that could help to minimize adverse effects of hoof trimming methods. Front and hind hooves of 2-year-old, previously untrimmed, pastured dairy ewes of six Iranian breeds (Afshari, Moghani, Kurdi, Makoui, Chaleshtori, and Lori-Bakhtiari; n = 180 ewes; 30 ewes per breed) were collected after slaughter. Medial and lateral claws were incised sagittally and anatomical measurements such as toe length, heel height, toe height, sole thickness, sole length, and toe angle were recorded in each claw. Data were analyzed using mixed model equations including breed, claw (lateral or medial), hoof (front or hind) and their interactions as fixed effects, and ewe as random effect. Breed differences were observed for all hoof measurements (P < 0.05). Chaleshtori sheep had higher measurements for most of the traits studied while Afshari and Makoui sheep had lower measurements. All measurements, except for toe length and toe height to solar surface to heel height ratio, were significantly greater in the front hooves than in the hind hooves (P < 0.05). Soles were longer in the medial claws compared to the lateral claws of the front hooves (P < 0.05). Results suggest the observed breed differences could interfere with establishing a standard, uniform hoof trimming method for sheep. For instance, it might be possible that while Afshari and Makoui sheep could require more conservative trimming, Chaleshtori sheep could require to be trimmed more. In consequence, hoof trimming methods might need to be adjusted to specific breed characteristics to avoid possible tissue damage.
本研究的目的是比较六个不同伊朗绵羊品种的蹄部解剖结构、蹄生长模式和蹄负重面，以确定蹄部解剖特征中可能存在的差异，这些差异有助于将修蹄方法的不利影响降至最低。在屠宰后收集了六个伊朗品种（阿夫沙里、莫加尼、库尔德、马库伊、查莱什托里和洛里-巴赫蒂亚里；n = 180只母羊；每个品种30只母羊）2岁、此前未修剪过且在牧场放牧的奶用母羊的前蹄和后蹄。在内侧和外侧蹄爪上进行矢状切开，并记录每个蹄爪的解剖学测量数据，如趾长、跟高、趾高、蹄底厚度、蹄底长度和趾角。使用混合模型方程分析数据，将品种、蹄爪（外侧或内侧）、蹄（前蹄或后蹄）及其相互作用作为固定效应，将母羊作为随机效应。所有蹄部测量均观察到品种差异（P < 0.05）。查莱什托里绵羊在大多数研究性状上的测量值较高，而阿夫沙里和马库伊绵羊的测量值较低。除了趾长和趾高与蹄底表面至跟高的比值外，所有测量值在前蹄中均显著大于后蹄（P < 0.05）。前蹄内侧蹄爪的蹄底比外侧蹄爪的蹄底更长（P < 0.05）。结果表明，观察到的品种差异可能会干扰为绵羊建立标准、统一的修蹄方法。例如，阿夫沙里和马库伊绵羊可能需要更保守的修剪，而查莱什托里绵羊可能需要更多的修剪。因此，修蹄方法可能需要根据特定品种特征进行调整，以避免可能的组织损伤。
