Once the pullets arrive at the layer house they are fed a layer ration high in calcium (egg shells require a LOT of calcium!) and given 14-16 hours of light daily to stimulate egg production. Most producers like flocks to begin laying at around 20 weeks of age. A flock of hens will lay efficiently for 60-65 weeks.his saves time and money separating the females for egg production. Todayâs egg producing hens can produce over 300 eggs per year; this is over twice the average of 150 eggs per year in 1947.
DNA is double helical in structure. each spiral strand, composed of a sugar phosphate backbone and attached bases, is connected to a complementary strand by hydrogen bonding (â¦ non-covalent) between paired bases, adenine (A) with thymine (T) and guanine (G) with cytosine (C).
DNA Structure. DNA structure An overview. The DNA structure consists of two chainlike molecules (polynucleotides) that twist around each other to form the classic double-helix. The cell s machinery forms polynucleotide chains by linking together four nucleotides.