Poultry Products Technology

• Loose Housing Layout Standards (BIS Standards):
• In a standard open-lot loose housing barn for dairy cattle:
• Each adult cow is provided with a covered resting shed and an attached open paddock (loafing area).
• The open paddock area is designed to be approximately double the covered area:

(e.g., adult cow: $3.5\text{ m}^2$ covered area and $7.0\text{ m}^2$ open paddock area).

• nalysis:
• (1:2): Correct ratio of covered to open space.

Correct option: (2) 12

• Components of the Calving Interval ($CI$):
• The calving interval is the time elapsed between two consecutive calvings:

• Biological Variation:
• The Gestation Period is a biologically conserved physiological constant within a breed ($\approx 280-285\text{ days}$ in cattle, $305-310\text{ days}$ in buffaloes), showing minimal variance ($\lt 1-2\%$).
• The Service Period (Days Open) (time from parturition to successful conception) varies enormously from $60\text{ days}$ to $\gt 200\text{ days}$ depending on postpartum estrus onset, heat detection efficiency, and conception rate.
• Thus, virtually all ($\gt 95\%$) variation in calving interval is driven by the Service period.
• nalysis:
• (Service period): Correct.

Correct option: (2) Service period

• Pullet Output of Commercial Layer Parent Stock:
• single female parent breeder (dam) of commercial egg-type stock (e.g., BV-300, Bovans, Hy-Line) produces approximately $280\text{ to }300\text{ total eggs}$ up to 72 weeks of age.
• With $90\%$ settable eggs, $85\%$ hatchability of fertile eggs, and a $50:50$ sex ratio at vent sexing:

Correct option: (3) 135