Effects of the use of feed enzyme in the growth of fattening pig feed Various nutrients in animal diets, due to a variety of factors, often have some degree of digestion and malabsorption, resulting in reduced animal performance and economic efficiency . Enzymes play a key role in the digestion and absorption of animal nutrients. According to the nutritional and physiological needs of animals, research and development of feed enzyme preparations using biotechnology have achieved breakthroughs in many aspects. As a safe, natural and environmentally friendly green product, various types Enzyme preparations are welcomed by the feed industry and aquaculture. At present, there are many products in the United States and Europe in the domestic market. In order to understand the effects of the use of Japanese enzyme preparation products, the use of enzymes for feeding enzymes has been selected for experimental research. The experiment was conducted between May and September 2001. 4. Discussion and analysis of complex enzyme preparations containing proteases, amylases, lipases, etc., assists the enzymes in the digestive tract of pigs, promotes digestion and absorption of feed nutrients, accelerates growth, increases feed efficiency, and reduces diarrhea. There is a role. In the hot season, it also has a certain degree of heat stress resistance. Experiments have shown that the use of feed enzyme has a good overall effect in piglet diets. This experiment demonstrated that the use of feed enzyme in mid-large pig diets also has good production and economic effects. Under this experimental condition, the effect of adding the enzyme for feeding at medium and large pig stages was more prominent in middle pigs. In the big pig stage, different enzyme-enriched diets were better than the control group in comprehensive dietary effects, but there was no significant difference between trials 1 and 2 and trial group 1 was slightly better than group 2. The reasons for this need to be further explored. During the experiment, during the high temperature season in the south, the temperature of the barnhouse was up to 42°C, and the high temperature had a certain impact on the speed of weight gain. Therefore, it is not expected to approach 90Kg on the market within the estimated time. In spite of this, all the conclusions of this experiment still provide scientific basis for understanding the feeding effect of the feeding enzyme.
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1. Materials and Methods
A. The main components and activity content of the enzyme preparation product are protease 5000 U/g, amylase 37500 U/g, cellulase 2000 U/g, lipase 1500 U/g, and gelatinase 1000 U/g. This product is sold under the name Slefeed and is developed and manufactured by the Japanese company Sinsui.
B. For experimental animals, 63 crossbred piglets of Duchang crossbred with a healthy age of about 20kg were selected.
C. The experimental group randomly divided the experimental group into three groups: control group, trial group 1, and trial group 2. Each group had two columns, each with 10 and 11 heads respectively. Each column has the same proportion of males and females. The experimental pigs were fed in the same pig house and the pigs were headed in the same direction. The experimental pigs entered the formal trial after 10 days of adaptation. At the beginning of the formal trial, there was no significant difference in weight between the groups (P>0.05).
D. The experimental diet was a corn-soybean meal diet and was fed in two stages. Dietary ratios and nutritional levels are shown in Table 1. In the first stage, the three groups had the same dietary ratio and nutritional level, and only added 200 g/ton of feed enzyme in the first and second groups of feeds. In the second stage, the ratio of the diets in the control group and the experimental group was the same as the nutritional level. In the second group, 200 g/ton of the enzyme was added. The experimental group 1 diets were appropriately changed in the experimental 2 groups of diets, ie, wheat bran was used as a substitute for soybean meal (28 kg/ton, wheat price was 1.04 yuan/kg, and soybean cake was 1.83 yuan/kg. .
Table 1 Diet composition and main nutrient levels Phase I Phase II Control group trial 1, 2 groups Control group Test group 1 group Test 2 groups Corn 69.95% 69.95% 69.95% 69.95% 69.95% Wheat bran 8.0% 8.0% 8.0% 10.8% 8.0% Bean cake 9.5% 9.5% 10.7% 7.9% 10.7% Vegetable moromi 2.0% 2.0% 3.0% 3.0% 3.0% Cottonseed 3.0% 3.0% 3.0% 3.0% 3.0% Fishmeal 4.2% 4.2% 2.0% 2.0% 2.0% Stone powder 1.0% 1.0% 1.0% 1.0% 1.0% Calcium hydrogen phosphate 1.0% 1.0% 1.0% 1.0% 1.0% Salt 0.28% 0.28% 0.28% 0.28% 0.28% Anti-mold agent 0.05% 0.05% 0.05% 0.05% 0.05% Enzyme preparation / 0.02% / 0.02% 0.02% Enzyme preparation / 0.02% / 0.02% 0.02% Premix 1.0% 1.0% 1.0% 1.0% 1.0% Total 100% 100% 100% 100% 100% Nutrition level DE MJ/kg 13.01 13.01 12.89 12.80 12.80 CP % 16.00 16.00 14.89 13.23 14.10 Lysine % 0.74 0.74 0.62 0.53 0.60 Methionine % 0.58 0.58 0.54 0.52 0.54 Calcium % 0.78 0.78 0.70 0.68 0.70 Phosphorus % 0.63 0.63 0.53 0.54 0.53 E. Feeding and management trials Pigs are fed methods to eat for a certain period of time as a principle of free drinking water. The vaccination and other routine management are carried out according to the rules of the farm.
F. The determination items and data processing mainly determine the feed intake per stage, total pig weight gain, and the number of diarrhea. The average daily weight gain, feed-to-meat ratio, and diarrhea rate were calculated for each group of pigs. Compare economic benefits. SAS software was used for analysis of variance and multiple comparison (LSD method).
2. test results.
A. The statistical results of weight gain comparison showed that the average total weight gain in the first stage of the control group and the experimental groups 1 and 2 was 29.47, 33.17, and 32.23 kg, respectively; the daily weight gains were 536, 603, and 586 g, respectively. Significant levels, in which test 1 and 2 groups increased by 12.50% compared with the control group (see Table 2 for the effect of P gain).
Table 2 Effect of weight gain
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Group Feeding days Number of heads Average weight kg Average end weight kg Average head weight kg Average daily weight g Control group 55 21 24.071.45 53.343.50 29.47 53652 41 21 53.543.50 80.766.00 27.22 66498 21 24.071.46 80.766.00 56.69 59157 Test 1 Group 55 21 24.261.30 57.433.29 33.17 60343 41 21 57.433.29 86.384.10 28.94 70658 96 21 24.261.30 86.384.10 61.12 64749 Test 2 groups 55 21 24.271.42 56.502.86 32.23 58642 41 21 56.502.86 84.863.62 28.36 69269 96 21 24.271.42 84.863.62 60.59 63143 B. The weight ratio of the material weight to the statistical results at each stage is shown in Table III. As can be seen from the table, the feed-to-weight ratios in the first stage of the control group and the experimental groups 1 and 2 were 2.57:1, 2.34:1, 2.38:1, respectively; the concentrations in the experimental groups 1 and 2 were lower than those in the control group. 95%, 7.39%. The ratio of feed weight in the second stage was 3.37:1, 3.16:1, 3.18:1, respectively; test groups 1 and 2 were 6.23% and 5.64% lower than the control group. The feed-to-weight ratio of the whole stage was 2.96:1, 2.72:1, 2.76:1, respectively; the test groups 1 and 2 were 8.11% and 6.76% lower than the control group. In the whole stage, the feed-to-weight ratio between the experimental groups is quite the same, with little difference.
C. Feed intake of each group at each stage of feed intake is shown in Table III.
The average food intake among the groups was basically the same.
The average total head intake in the group stage kg average feed intake kg in the first day than the control group in the first stage 75.84 1.38 2.57 second stage 91.69 2.24 3.37 full stage 168. 00 1.75 2.96 Test 1 Group 1 Stage 77.52 1.4 2.34 Stage 2 91.48 2.23 2.34 Stage 169.00 1.76 2.72 Test 2 Group 1 First Stages 76.70 1.39 2.37 Stage II 90.18 2.20 3.18 Stages 167.04 1.74 2.76 D. Diarrhea Records During the entire trial, only a small amount of diarrhea occurred in the first stage, according to the statistical control group of 5.0%, and the test 2 groups of 1.0%.
3. In the first stage of the economic benefit analysis, the ton cost of the control group, trial group 1 and trial group 2 (according to the purchase price of raw materials at that time) was 1469.04, 1499.04, and 1499.04 yuan respectively; the cost per kilogram of weight gain It is 3.78, 3.51, and 3.55 yuan. The second-phase tonnage cost of food is 4.51, 4.25, 4.35 yuan. The average weight gain per kilogram in the whole period was 4.13, 3.85, and 3.94 yuan, respectively. Compared with the control group, the first phase of trials 1 and 2 can reduce costs by 7.14% and 6.08%; the second phase decreases by 5.76% and 3.55% respectively; the whole phase is 6.78% and 4 .60%. However, there was no significant difference in the cost between stages 1 and 2 of the trial. 