Statistical Analysis of Effects of Litter Mortality, Birth Weight, Farm of Origin, Year of Birth on Growth Performance of Pigs in Vietnam

The table shows adjusted R-squared of 0.06463 which means the independent variables birth weight, litter mortality, and farm of origin predict 6.4% of the dependent variable Day 21 average piglet weight. T-stats for 3 variables is -3.55, -3.82, and 7.27 which indicate statistical significance of all 3 variables in predicting Day 21 average weight. The combined three variables have the most effect when grouped together to determine Day 21 average piglet weight. The Day 21 weight can be predicted using the equation: Day 21 Average Weight of Piglet = 3.693075 + 1.102912 (birth weight) - 1.30327 (litter mortality) - 0.0523 (farm of origin number) +E In order to determine the effects of different factors such as breed, farm of origin, year of birth, litter mortality and birth weight (W0) in the average weight of piglets after twenty-one days (W21), a number of regression analyses are completed.

The results of the regression analysis of the year of birth and breed as independent variables show they have almost no effect on predicting the value of the dependent variable W21. The regression analysis of litter mortality and farm of origin shows the statistical significance yet the limited ability of both independent variables in predicting and influencing 0.8% and 0.7% respectively of the value of W21.

Regression analysis of W0 on W21, show the statistical significance and ability of W0 to influence and predict 4.1% of the values of W21. The ability to predict the value of W21 is further enhanced by a regression analysis of three variables of litter mortality, the farm of origin, and W0 together. The three variables influence and predict 6.4% of W21 all together.

It is concluded that the factors of litter mortality, the farm of origin and birth weight have the most effect on pigs' future weight. Vietnam needs to concentrate its pig farms in farms proved to provide better growing conditions. They also need to research methods to maintain zero litter mortality as to enhance the weight of their grown pigs.

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