Effects of enzyme complex supplements on growth performance, nutrient metabolism, heat production, and greenhouse gas emissions in pigs

• Main Authors: Chiu, Yu-Kuan, 邱鈺觀
• Other Authors: Liu, Shyh-Hwa
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/4zg5ex

碩士 === 國立屏東科技大學 === 動物科學與畜產系所 === 107 === The objectives of this study was to determine the effects of enzyme complex supplementation on growth performance, nutrient metabolism, heat production and greenhouse gas emissions of pigs. This study was divided into two trials, each of trial had experiment of growth performance, nutrient metabolism, heat production, and greenhouse gas emissions. Trial 1 determined the effect of different complex enzymes on pigs. The growth performance experiment used thirty-two LYD nursery pigs with an average body weight of 17.61 kg were randomLy allocated into four treatments according to respective body weight. There were 4 replications in each treatment and had 2 pigs in each replication. The feed formulations were control, enzyme complex A (0.075%), B (0.1%) and C (0.1%). Ad libitum feeding and drinking water were provided to the pigs and the duration of the study was 4 weeks. Initial body weight, weekly body weight gain, daily feed intake, feed efficiency, diarrhea times and diarrhea pig numbers were recorded. The metabolic experiment used sixteen LYD pigs with an average body weight of 50.54 kg. There were 4 replications in each gain in the second week. Enzymes A and C treatment tended to have better feed efficiency during the whole period. Enzyme B and C treatment tended to have higher diarrhea number the whole period. Enzyme A treatment tended to have higher digestibility of copper and zinc. Enzyme B treatment tended to have higher energy, P, Cu, Fe and Mg digestibility, and the enzyme C treatment also had higher P, Na and Mg digestion. Enzymes A, B and C treatment had higher heat production and tended to reduce CO2 and N2O emissions. To summarize the result of experiment, the effect of enzyme B is the best, followed by enzyme C, and the effect of enzyme A is less obvious. In Experiment 2, the results show that in the same amount of feed intake (restrict feeding), the 0.1% and 0.2% enzyme B treatment tended to have higher weekly weight gain and had higher weekly gain in 1-2 week (P<0.05). 0.1% and 0.2% enzyme B treatment also had better feed efficiency in 1-6 week (P<0.05). Although the 0.1% enzyme B treatment tended to have higher diarrhea number in the first week, 0.1% enzyme B treatment had lower diarrhea number in the whole period. In addition, 0.1% and 0.2% enzyme B treatment increased the digestion and metabolic rate of protein, energy, dry matter, ash and minerals. 0.1% and 0.2% enzyme B treatment had higher heat production (P<0.05) and lower CO2 emission (P<0.05). To summarize the result as stated above, addition of enzymes complex could improve the growth performance and nutrient metabolism rate of pigs, especially addition of 0.1% enzyme B. The enzyme complex could increase heat production of pigs and reduce emissions of greenhouse gases (CO2 and N2O).