Correlated responses of respiratory disease and immune capacity traits of Landrace pigs selected for Mycoplasmal pneumonia of swine (MPS) lesion

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• 作者：Toshihiro Okamura ; Kouki Maeda ; Wataru Onodera ; Hiroshi Kadowaki ; Chihiro Kojima-Shibata ; Eisaku Suzuki ; Hirohide Uenishi ; Masahiro Satoh and Keiichi Suzuki
• 刊名：Animal Science Journal
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：87
• 期：9
• 页码：1099-1105
• 全文大小：270K
• ISSN：1740-0929

文摘

Five generations of Landrace pigs selected for average daily gain, backfat thickness, Mycoplasmal pneumonia of swine (MPS) lesion score, and plasma cortisol levels, was executed to decrease the MPS lesion score. Genetic parameters and correlated genetic responses for respiratory disease and peripheral blood immune traits were estimated in 1395 Landrace pigs. We estimated the negative genetic correlation of MPS lesion score with phagocytic activity (PA) at 7 weeks of age (-0.67). The breeding values of PA at 7 weeks of age and 105 kg body weight and the correlated selection response of the ratio of granular leukocytes to lymphocytes at 105 kg body weight were significantly increased, and sheep red blood cell-specific antibody production (AP) was significantly decreased in a selection-dependent manner. Increasing of natural immunological indicators (e.g. PA) and decreasing of humoral immunological indicator (e.g. AP) were observed due to genetically decreasing MPS lesion score.