Those who are kept on beyond that age must be given six months' notice of any attempt to "retire" them, lest it be used as a cover for sacking.
Things need to be kept on an age-appropriate level.
Cothran considered the herd to be in genetic equilibrium, although he cautioned that a minimum of 120 breeding-age animals should be kept on the range to maintain the genetic health of the herd.
As a result, customers are being kept on hold for ages or asked to wait in long queues.
Selection candidates were kept on farm until the age of six months.
They also found that if rodents are kept on restricted diets until middle age and then switched to eating what they want, they lose the life-prolonging effect of dieting.
Partial depopulation is essentially based on an interval of 14 days, where no pigs under 10 months of age are kept on the farm [ 1, 8, 18].
Six healthy Simmental heifers (SA 2, SA 5, SA 7, SA 10, SA 11, and SA 12) between 11 and 20 months of age were kept on a paddock 20 m away as a control group [ 23].
However, examination of histological pancreatic sections from these mice at 6 months of age that were kept on doxycycline revealed no β-cell tumor formation (data not shown).
Some mice were kept on an NCD until 34 weeks of age.
They were kept on the floor until 35 days of age, and then transferred to individual cages, and provided a laying diet henceforth.
