Heifer cow

Heifer is a young female cow before she has had her first calf. Heifer selected on the basis of progeny testing, i.e. the potential of the size and milk production of the dam, their proper growth, good health and freeness from any genetic abnormality.

Heifers are best suited for shorter feeding periods. Heifers are well suited for those areas where light carcasses are desirable. Most heifers available for feeding are young and light.

Heifers, tending to be smaller in mass and having a greater fat content, can also be given the same type of growth promoting implants that are use in steers to increase their mass an percentage of lean muscle.

Until they weight 600 pounds, heifers require more than 66 percent total digestible nutrients (TND) in their ration. Pasture usually runs 55 percent and hay and hay silages average 58 percent.
Heifer cow 

Notes:
The male is first a bull calf and if left intact becomes a bull; if castrated he becomes a steer and in about two or three years grows to an ox. The female is first a heifer calf, growing into a heifer and becoming a cow.