Feeding Study of Recycled Cafeteria Food Waste on Hog Production with Variable Genetic Background

• Main Authors: Jhih-Siang Chang, 張智翔
• Other Authors: Hsiu-Luan Chang
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/33638039348168236542

碩士 === 國立屏東科技大學 === 動物科學與畜產系所 === 98 === Pig farmers aimed to select breeding stocks with desirable lean mass and carcass quality in addition to thin backfat, fast growth and high feed efficiency. However, the selection response of economically important traits is highly correlated with genetic and environment. The aim of this study was to investigate the effects of recycled cafeteria food waste on growth and carcass traits in hogs with different genetic backgrounds. Landrace (L), Taoyuan (T), and the Landrace and Yorkshire crossbred (LY) gilts from a hog farm located in the middle of Taiwan were artificially inseminated by Duroc semen. A total of 284 piglets were produced, including 134 and 150 males and females, respectively, and evaluated for growth and carcass performances. All males were castrated at seven days of age. Piglets were randomly assigned to three diets, i.e., conventional corn-soybean diet (CS), 50% CS + 50% dehydrated cooked recycled cafeteria food waste (DF), and liquid cooked recycled cafeteria food waste (CF). Growth performances recorded were weights at birth, at 28-day-old, 102-day-old, 189-day-old, 224-day-old and 252-day-old, and thus the average daily gains during growing and finishing periods were also calculated. The backfat thickness at 189 and 224 days of age were measured. Hogs were slaughtered around 252 days of age and carcass traits recorded were carcass length, backfat thickness (measured at the first, 5th and last ribs), carcass longissimus muscle area and visceral weight. A general linear model was employed for analysis, which included the genetic background, gender and diet as fixed effect, and residual as random effects. Results showed that the hogs with T lineage were significantly weighed less at weaned, and at 102, 189 and 252 days of age, and the same trend was also observed when comparisons for average daily gains during nursing period were made. Meanwhile, the TD hogs showed significantly thicker backfat at 189 and 224 days of age than those of non-TD one. Barrows showed heavier weights at 189, 224 and 252 days of age, larger average daily gain during finishing period, and thicker backfat at 189- and 224-day-old than those of gilts. In addition to weight at 189-day-old, no significant difference for weights of hogs was observed when comparisons of diets were considered. However, CS group hogs had higher averaged daily gain during finishing period, and CF group hogs showed more backfat at 189- and 224-day-old. In addition, preliminary results of feeding cost analysis indicated that the application of kitchen wastes on finishing hogs could cut cost considerably. In summary, both growth rate and backfat deposition of hogs varied as genetic backgrounds, but the effects of diet on both backfat thickness at finishing and on carcass performances was not significant when comparisons were made within genetic background. Therefore, the genetic background of hogs should be first taken into account to optimize the efficiency of recycling kitchen waste on hog production.