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Pig Growth Rates in Vietnam - Article Example

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Summary
Climate and nutrition highly affect the growth rates of domestic animals specially pigs. In Vietnam, farmers lack the knowledge to provide adequate conditions of nutrition and weather protection to have a good growth rate average of pigs they raise (Phuoc & Ngoan 2005)…
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Pig Growth Rates in Vietnam
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Pig Growth Rates in Vietnam

Download file to see previous pages... The data of litter mortality, birth weight, farm of origin, year of birth, and weight of big after twenty one days concerning a sample of one thousand pigs were collected and recorded. The purpose of the study is to compare growth performance of these two breeds of pigs by analyzing the effect of the different factors monitored in isolation and combined on the growth of pigs represented by their average weight after twenty one days of their birth.
To determine the relationship between the Day 21 average piglet weight and the various influences monitored during the experiment such as breed, farm of origin, year of birth, litter mortality and birth weight, the following Ordinary Least Squares (OLS) regression analyses were examined:
The non-numerical value of Breed was coded numerically so that Breed equals one for Landrace (L) piglets and equals to zero for Yorkshire (Y). Regression analysis was applied with the numerical representation of breed as the independent variable and the dependent variable Day 21 average weight. Table 1 summarizes the results of the regression analysis.
Table 1 shows adjusted R-squared of -0.00078 which means the independent variable breed predicts 0.07% of the dependent variable Day 21 average piglet weight. T-stat for this variable is 0.46674 so it is statistically insignificant. Both values indicate changes in breed do not affect the Day 21 average piglet weight.
Regression analysis was applied...
0.000218
Adjust R2
-0.00078
Standard Error
0.793569
Observations
1000

Table 1 shows adjusted R-squared of -0.00078 which means the independent variable breed predicts 0.07% of the dependent variable Day 21 average piglet weight. T-stat for this variable is 0.46674 so it is statistically insignificant. Both values indicate changes in breed do not affect the Day 21 average piglet weight.

4.2 Analysis II: Relationship between Day 21 Average Piglet Weight and Farm of Origin
The non-numerical value of the farm-of-origin variable is numerically encoded to allow statistical analysis of the variable using the following code shown in table 2.

Table 2: Encoding of Farm of Origin into Number
Farm of Origin
Numerical Code
A
1
B
2
C
3
D
4
E
5
F
6
G
7

Regression analysis was applied with the numerical representation of farm of origin as the independent variable and the dependent variable Day 21 average weight. Table 3 summarizes the results of the regression analysis.

Table 3:Regression results for Day 21 Average Piglet Weight as a function of Farm of Origin
Independent Variable
Enumerated Farm of Origin
Dependent variable:
Day 21 Average Piglet Weight
Constant
5.038045
Coefficient
-0.04348
T Stat
-2.87992
R2
0.008242
Adjust R2
0.007248
Standard Error
0.790379
Observations
1000

Table 3 shows adjusted R-squared of 0.007248 which means the independent variable farm of origin predicts 0.7% of the dependent variable Day 21 average piglet weight which is still a small influence but with more effect than the breed variable. T-stat for this variable is -2.87992 so it is statistically significant. Both values indicate the limited effect of breed in Day 21 average piglet weight. The Day 21 weight can be predicted to some limited extent using the equation:
Day 21 Average Weight ...Download file to see next pagesRead More
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