|
KMID : 1025520010430040431
|
|
Journal of Animal Science and Technology
2001 Volume.43 No. 4 p.431 ~ p.444
|
|
|
Investigation of Breed , Sex and Environmental Factors of Swine Economic Traits from On - farm Test Records
|
|
|
|
|
Abstract
|
|
|
This study was conducted to investigate the effects of breed, sex and environmental factors of swine based on the on-farm performance tested records of 57,316 pigs under the supervision of Korean Animal Improvement Association from 1992 to 1999. The traits studied were average backfat thickness, last rib backfat thickness, loin depth, percent lean, average daily gain, age at 90㎏ and age at 100㎏. The result obtained in this study was summarized as follow ;
1. The effect of breed was statistically significant for all traits. Landrace had the thinnest backfat and Duroc had the most thickness. In loin depth, Yorkshire had the most thickness while Duroc had the thinnest. Landrace was highest and Duroc was lowest in percent lean. In average daily gain, Duroc was highest and Landrace were lowest. Duroc reached 90㎏ and 100㎏ at the youngest age and Landrace reached 90㎏ and 100㎏ at the oldest age.
2. Sex factor showed an important influence on all traits. For average backfat thickness, backfat thickness, percent lean, average daily gain, age at 90㎏ and age at 100㎏, males were superior to females. But females had more loin depth than males.
3. Month of birth factor showed significant effects on all traits. Pigs born in summer had higher values for most traits. But pigs born in autumn had a higher value for percent lean and in spring had higher values for age at 90㎏ and 100㎏. The effect of year of birth also had significant effects on all traits. The growth traits were improved with the progress of year, but carcass traits showed an opposit trend.
4. Parity of sow factor showed significant influence on all traits. Pigs born in the 2nd-4th parities had the tendency of being superior to those born in other parities.
5. The age at the end of test included as a covariate in the analysis, showed a significant influence on average backfat thickness, last rib backfat thickness, loin depth and percent lean. The pigs with older age at the end of test tended to have higher backfat thickness, loin depth and percent lean. The age at the end of test had significant influence on all traits.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|
|