It is a trend to move share price of those companies same period even though with low performers. As industry leader GRAN always has more interest and lowest share price. But it is the less worth and least profitable company out of those. Profit margin is low and heavily dependable world market prices for corn flour.
BFL is a good share but it is not attractive as TAFL. March-17 quarter they earned their profit almost as other operational income but not from operations.
TAFL always maintain good profit margin as we cant see any other industry. Strong earnings and increasing dividend income will create this share more attractive in the market. There will be a day in near future TAFL performing alone.
For the poultry industry there is a seasonal effect. The ones who has holding power for few months TAFL will give a decent gain.