| In this test there are 65±3kg fattening pigs of binary crossbreeding were used as experimental subjects,study in the effects of different feed formulations on growth performance of growing-finishing pigs were studied under different feeding conditions of the station feeding group(briefly group A)and the traditional feeding group(briefly group B).The traditional feeding conditions with different formula for growth pig growth performance and the effect of pig growth performance test to explore the measurement station feeding section is expected to promote growth mechanism,finally passed the test of the slaughter and carcass segmentation,research different feeding conditions on the influence of growth pig carcass high value parts development,explore the market volatility under the optimal feeding scheme of pig growth.The experiment was divided into three parts: experiment 1: A comparative experiment between the test station feeding and the traditional ground feeding: 40 experimental pigs were randomly divided into 8 groups,5 pigs in each group,4 groups were randomly selected and recorded as group A,and were fed by the test station;The remaining four groups were recorded as group B,and were fed with the conventional flat surface feeding method.All pigs were free to eat and drink during the test period.The results of experiment I showed that the average stall weight of pigs in group A was 3.29% higher than that in group B,with A significant difference(P < 0.05).The daily food intake of group A was 3.95% lower than that of group B(P < 0.05).The daily food intake of group A was 7.03% lower than that of group B.There was no significant difference in daily weight gain(P>0.05).The daily weight gain of pigs in group A was 1.9% higher than that in group B.There was no significant difference in the final slaughter rate between the two groups(P > 0.05).Experiment 2: during the experiment,four kinds of commercial materials with different addition amounts of rice bran meal were used for feeding.The pigs in group A were divided into groups A1,A2,A3 and A4.In group A2,rice bran meal was used to replace 10% of commodity materials,and in the same way,group A3 was used to replace 20% of commodity materials,and group A4 was used to replace 30% of commodity materials.Similarly,group B and group A are grouped and used in the same way: group B1 USES 951 commodity materials,group B2 USES 10% commodity materials,group B3 USES 20% commodity materials,and group B4 USES 30% commodity materials.The results of experiment 2 showed that the daily weight gain of the A4 group was 8.4% lower than that of the A1 group,with a significant difference(P < 0.01);the difference between the A2 group and the A3 group was not significant(P > 0.05);the difference between the A2 group and the A3 group was significant(P < 0.05);and the difference between the A2 group and the A3 group was significant(P < 0.05).Food intake: there was no significant difference between group A1 and group A2(P > 0.05).There was no significant difference between A3 group and A4 group(P > 0.05),between A1 group and A3 and A4 group(P < 0.05),and between A2 group and A3 and A4 group(P < 0.05).Weight ratio: there was no significant difference between group A1 and group A2(P > 0.05).There was no significant difference between A3 group and A4 group(P > 0.05),between A1 group and A3 and A4 group(P < 0.05),and between A2 group and A3 and A4 group(P < 0.05).Daily weight gain: there were significant differences between group B1 and group B2(P < 0.05),and significant differences between group B1 and group B3(P < 0.05).There were significant differences between group B1 and group B4(P < 0.05).There was no significant difference in the final slaughter rate between the groups(P > 0.05).Test 3: all pigs were slaughtered from day 53 to day 53,and the basic carcass indexes were determined.Carcass fine segmentation was conducted according to the slaughterhouse regulations on day 54 after one night of cold storage,and the weight of each part was weighed and recorded.Finally,SPSS 23 software was used to establish a multiple linear regression model between the high value parts of the carcass and the total value of the carcass.The final multiple linear regression model is:Y=53.277+X1*2.808+X2*1.387+X3*1.264+X4*2.492+X5*1.047,where Y represents carcass value,53.277 is a random error,X1 is the meat value of plum,X2 is the meat value of foreleg,X3 is the front row with neck,X4 is the rib row value,and X5 is the rear leg meat value.The influence coefficient after Xn reflects the influence of each high-value segment on the overall carcass value.It can be seen from the influence coefficient in the formula that the influence of each high-value segment on the overall carcass value of slaughtered pigs in this experiment is in order from high to low: meimei meat,rib steak,foreleg meat,front neck steak and hind leg meat.Pre-feeding was conducted for 3 days before the start of the experiment.The formal experiment was conducted for 52 days and slaughter was conducted on the 53 rd day.During the experiment,the food intake and body weight of group A will be automatically recorded by the measuring station.Data will be uploaded every day,and problems in the measuring station will be dealt with in time.Then the amount of feed intake in each group was measured by weighing the remaining feed in the cylinder.The feces of each group were collected by acid insoluble ash method from feeding experiment to day 52,and samples were prepared according to the regulations for the determination of apparent digestibility of dry matter and protein. |
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