Differences between both sexes of Taoyuan pigs in terms of carcass traits, chemical composition of muscles, fatty acid composition and iodine values of muscles and adipose tissues.
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概要
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In order to investigate the differences between male and female Taoyuan pigs in terms of carcass traits, chemical composition of muscles, fatty acid composition and iodine value of muscles and adipose tissues, 3 male and 3 female pigs were fattened from the body weight of 30kg up to approx. 90kg by feeding the meat production performance testing feed for pigs.The carcass weight and yield of dressed carcass (in percentage) were higher in female pigs than in male pigs, and the carcass length (proximalis of symphysis pubis-atlas), loin length I (proximalis of symphysis pubis-proximalis of 1st vertebrae thoracis) and loin length II (distalis of last vertebrae lumbales-proximalis of 1st vertebrae thoracicae) were longer in male pigs than in female pigs. The ratios of the fore part and the hind part of the body were higher in male pigs than in female pigs, and that of the middle part of the body was higher in female pigs than in male pigs. As for the ratios of bone, fat and muscle in the composition of the hind parts, the ratios of bone and muscle were higher in male pigs than in female pigs, while that of fat was higher in female pigs than in male pigs. The mean thickness of back fat at the 3rd to 4th and the 11th to 12th thoracic vertebrae, and the 3rd to 4th lumbar vertebrae in female pigs were about twice as much as that of the male pigs. The loin eye area of male pigs was similar to that of female pigs.The ranges of values of moisture, crude protein, and crude fat in muscle tissues (M. longissimus dorsi, M. biceps femoris and M. semimembranosus) were 73.8-75.9%, 20.9-22.9% and 1.3-1.9% for male pigs, and 73.6-75.0%, 20.5-22.2% and 2.2-3.6% for female pigs, respectively. The muscle tissues of female pigs tended to have higher proportion of crude fat, but less moisture and crude protein than those of male pigs.In conjunction with the composition of fatty acids of the muscle tissues, the amounts of C18:2, C20:2, C20:3 and C20:4 and the ratio of C18:2/C18:0 were higher in male pigs, and that of C16:0, C18:1 and saturated fatty acids were higher in female pigs. With respect to the composition of fatty acids of the adipose tissues, the amounts of C18:2, C20:2 and C20:4 and the ratio of C18:2/C18:0 were higher in male pigs, and that of C16:0, C18:1 and saturated fatty acids were higher in female pigs. The iodine value and refractory index of back fat and kidney leaf fat tended to be higher in male pigs. From the results of fatty acid composition and properties of adipose tissues, it was conceived that the back fat and kidney leaf fat from male pigs were slightly softer than those from female pigs.
- 日本養豚学会の論文
日本養豚学会 | 論文
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