A further 12 million male chicks are culled .
Many more animals die on farms , including an estimated 15 million lambs who die each year within 48 hours of birth due to inadequate protection from harsh weather .
A further 12 million male chicks are culled , and many more animals die on farms , including an estimated 15 million lambs who die each year within 48 hours of birth due to inadequate protection from harsh weather .