查詢結果分析
來源資料
頁籤選單縮合
題 名 | Log-linear Association Models Applied to Interpretation of Inheritance of Hoof Conformation and Health=以對數線性關聯模式解釋腳蹄健康與遺傳 |
---|---|
作 者 | 黃鈺嘉; | 書刊名 | 畜產研究 |
卷 期 | 39:1 民95.03 |
頁 次 | 頁69-85 |
分類號 | 437.22 |
關鍵詞 | 對數線性關聯模式; 母女對; 腳蹄; Log-linear association models; Daughter-dam pairs; Hoof; |
語 文 | 英文(English) |
中文摘要 | 使用10種不同的關聯模式分析12個由619至724對『母女』配對的5×5評分次數分配表(列聯表,Contingency Table),10種不同的關聯模式分別為: independence, main diagonal, uniform association, fixed distance, mover-stayer, minor diagonals (I), minor diagonals (II), pure distance, loyalty-distance與quasi-symmetry。十二個評分次數分配表,包括六個腳蹄性狀:蹄跟高(heel height)、蹄質地(hoof texture),蹄底厚度(sole thickness)、層偽趾面(subsle)、趾生長(toe growth)與承重狀況(weight transfer)。另外六個評分次數分配表則分別為螺旋蹄(corkscrew claw)、蹄根壞損(heel erosion)、趾間炎(interdigital dermatitis)、蹄發炎(laminitis)、蹄底潰瘍(sole ulcers)、白線裂痕(white line separation)等腳蹄性狀。其中八個性狀[蹄跟高、蹄質地、蹄底厚度、趾生長、承重狀況、螺旋蹄、蹄底潰瘍、白線裂痕] independence model未能被棄卻(G2<26.3, P>0.05),顯示蹄性狀母女遺傳關聯性不強,然而八個性狀中仍有五個可以找到較佳的解式模式。而在參數估計上uniform association model中12個性狀中仍有11個得到『正值』,而fixed distance model則估得『負值』的off-diagonal distance parameters,顯示母女間的遺傳關聯的存在。由於較差分數臨近的母女對出現機率較高以及較佳模式的選取顯示母女關聯存在於蹄跟高、蹄質地、層偽趾面、趾生長、螺旋蹄、蹄根壞損、指間炎與蹄葉炎等腳蹄性狀。 |
英文摘要 | Twelve 5 by 5 hoof trait contingency tables with 619 to 724 daughter-dam pairs were analyzed by ten different association models: independence, main diagonal, uniform association, fixed distance, mover-stayer, minor diagonals (I), minor diagnonals (II), pure distance, loyalty-distance and quasi-symmetry. Six hoof growth traits were heel height, hoof texture, sole thickness, subsole, toe growth and weight transfer and characterized hoof conformation. Six discrete hoof traits were corkscrew claw, heel erosion, interdigital dermatitis, laminitis, sole ulcers and white line separation. One contingency table represented each trait. Independence models for eight traits (heel height, hoof texture, sole thickness, toe growth, weight transfer, corkscrew claw, sole ulcers and white line separation) were not rejected (G2<26.3, P>0.05), and implied that genetic associations were not very strong. But, improved best association models were found for five of the eight traits. Eleven of twelve traits had positive uniform association parameters estimated from uniform association model and negative off-diagnonal distance parameters estimated from fixed distance model which supported genetic association between daughters and dams. Combining higher probabilities for daughter and dam with neighboring worst scores and improved fit through the best models, evidence of association between scores of daughters and dams for hoof conformation and health was supported for most hoof traits (heel height, hoof texture, subsole, toe growth, corkscrew claw, heel erosion, interdigital dermatitis and laminitis). |
本系統中英文摘要資訊取自各篇刊載內容。