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Relationship of Feed Intake, Daily Gain, Feed Efficiency and Age with Body Weight in Growing Pigs
Thesis Abstract:
Two kinds of rations were fed for $ months to 149 growing pigs consisting of seven breeds or strain, divide into boars, glits and barrows. Regresion analysis was then made for easch ration, breed/strain and six groups of individually fed pigs, with body weight as the independent variable (X) and average daily feed intake, daily gain and feed efficiency (feed,gain) as the dependent Varaibles (Y); and age (days) as the independent varaible (days) as the independent cariable (X) and body weight as the dependent variable (Y).
Twnenty-seven out of 28 treatment groupsd showed as significant relationship between body weight and feed efficiency (r=0.61 to 0.99) and 100% R, ranging from 37 to 98.
Ten out of 17 groups fed ration 1 showed significant correlations between body weight and feed efficiency (r=0.42 to 0.99) with a range of 18 to 00 for 100% R. On the other hand, all groups fed ration 2 did not show any significant relationship.
Eleven out of 17 group indicated no significant relationship between body weight and daily gain. However, 5 out of 11 group fed ration 2 exhibited a significant and positive relationship between these two variables r (r = 0.40 to 0.85 and range in 100% R from 16 to 72%.All groups manifested significant correlations between age and body weight (r = 0.76 to 1.00) with range in 100% Râ‚‚ from 58 to 100%
Variations were observed in the regression lines of feed intake, daily gain and feed efficiency on body weight and body weight on age; some were linear, some parabolic and other cubic. Eight out of 11 groups fed ration 2
Mean intercepts of feed intake, daily gain and feed efficiency on body weight were 0.92, 0.30 and 2.40 kg, respectively, while body weight on age was -23.21kg