if the initial body weight of chicks differs significantly between two breeds of broiler , so should we apply covariance to compare the effect of breeds on final body weight ?
check this link https://towardsdatascience.com/let-us-understand-the-correlation-matrix-and-covariance-matrix-d42e6b643c22
A solution is to plot initial body weight against final BW. If there is a linear correlation between them, so you can consider initial BW as covariate. My suggestion is plot a scatterplot. Another solution is to compare two model: First one with covariate and the second without covariate. Then compare R-square and significant effects in the results. Good Luck!
You have to use covariance analysis to avoid any variation other than your treatment. For instance, if you want to compare different forage on the weight gain of sheep, you have to analyze covariance as the initial weight, age, and breed of the sheep vary.
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