TY - JOUR
T1 - Selection for resistance to swine mycoplasmal pneumonia over 5 generations in Landrace pigs
AU - Kadowaki, H.
AU - Suzuki, E.
AU - Kojima-Shibata, C.
AU - Suzuki, K.
AU - Okamura, T.
AU - Onodera, W.
AU - Shibata, T.
AU - Kano, H.
N1 - Funding Information:
This work was supported in part by the Animal Genome Research Project of the Ministry of Agriculture, Forestry and Fisheries of Japan . The authors would like to thank the Miyagi Livestock Experimental Station farm staff, Miyagi Prefectural Meat Inspection Station, and Miyagi Meat Market Co., Ltd., for their support during this study.
PY - 2012/8
Y1 - 2012/8
N2 - The objective of this experiment was to evaluate the selection of a pig line with improved resistance to swine mycoplasmal pneumonia and meat production in Landrace pigs. The selection was conducted over 5 generations using estimated breeding values of daily gain (DG), backfat thickness (BF), and mycoplasmal pneumonia scores (MPS). In order to evaluate various lung lesions, we established two different rearing environments (regularly cleaned vs. not cleaned) for the pigs. The heritability estimates for DG, BF, and MPS were found to be 0.65, 0.60, and 0.07, respectively. To compensate for the low heritability of MPS we examined the genetic correlation of immunity traits with MPS to determine their usefulness in a selection index. Cortisol (COR) plasma levels at 105. kg body weight had a high positive genetic correlation (0.65) with MPS, and therefore used as an immunity trait. The average breeding values in the fifth generation, as expressed in standard deviation units, were 1.32 for DG, -0.70 for MPS, and -0.04 for BF and COR. The selection traits showed good genetic progress in 5 generations demonstrating the possibility of selecting for both disease resistance and high meat production in animals.
AB - The objective of this experiment was to evaluate the selection of a pig line with improved resistance to swine mycoplasmal pneumonia and meat production in Landrace pigs. The selection was conducted over 5 generations using estimated breeding values of daily gain (DG), backfat thickness (BF), and mycoplasmal pneumonia scores (MPS). In order to evaluate various lung lesions, we established two different rearing environments (regularly cleaned vs. not cleaned) for the pigs. The heritability estimates for DG, BF, and MPS were found to be 0.65, 0.60, and 0.07, respectively. To compensate for the low heritability of MPS we examined the genetic correlation of immunity traits with MPS to determine their usefulness in a selection index. Cortisol (COR) plasma levels at 105. kg body weight had a high positive genetic correlation (0.65) with MPS, and therefore used as an immunity trait. The average breeding values in the fifth generation, as expressed in standard deviation units, were 1.32 for DG, -0.70 for MPS, and -0.04 for BF and COR. The selection traits showed good genetic progress in 5 generations demonstrating the possibility of selecting for both disease resistance and high meat production in animals.
KW - Desired gain
KW - Disease resistance
KW - Genetic parameters
KW - Landrace pigs
KW - Mycoplasmal pneumonia
KW - Selection
UR - http://www.scopus.com/inward/record.url?scp=84862183691&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84862183691&partnerID=8YFLogxK
U2 - 10.1016/j.livsci.2012.03.014
DO - 10.1016/j.livsci.2012.03.014
M3 - Article
AN - SCOPUS:84862183691
SN - 1871-1413
VL - 147
SP - 20
EP - 26
JO - Livestock Science
JF - Livestock Science
IS - 1-3
ER -