Dimensions of Environmentally Controlled (EC) Tunnel-Ventilated Houses:
Modern EC broiler houses operate on negative-pressure tunnel ventilation where air enters through evaporative cooling pads at one end and exhausts through high-capacity fans at the opposite end.
The standard engineering length for effective tunnel airflow velocity without excessive static pressure drop is $300\text{ to }400\text{ feet}$ ($90\text{--}120\text{ meters}$), with a standard width of $40\text{--}50\text{ feet}$.
Correct option: (1) 300 ft
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Aravali is an indigenous dual-purpose chicken breed native to the Aravali hill ranges of Gujarat (Banaskantha and Sabarkantha districts) and adjoining Rajasthan.
Registered by ICAR-NBAGR as an official indigenous chicken breed of India.
Other Breeds: Hansli (Odisha), Kadaknath (Madhya Pradesh), Aseel (AP/Chhattisgarh).
Correct option: (1) Aravali
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Quantitative traits (e.g., egg production, body weight, growth rate) are controlled by numerous polygenes having small, cumulative additive effects.
They exhibit continuous variation and are highly susceptible to modification by environmental conditions (feed quality, ambient temperature, housing, disease challenge).
Correct option: (4) Environmental conditions
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