Development of replacement heifers
Proper heifer development hinges on achieving a desired weight before breeding without over-developing heifers to the point they are not prepared to live on pasture and forage-based diets the remainder of their life.
Most literature shows heifers should be developed to 65% of mature body weight, although some have had success at slightly lower percentages.
- Consider this scenario. Heifer Ranch maintains mature cows that weigh 1,400 lbs. that calve on March 1, and their cows wean 45% of their body weight. This results in heifer calves that weight 630 lbs. at weaning. If they are bred to calve on March 1 at two years of age, then the replacement female needs to be fed at a programmed gain of 1.04 ADG to weigh 910 at breeding. These numbers are surprising to some, but truth is heifers developed on a steady gain do not need high energy feeds. Develop a least-cost ration, account for “profit robbers” (mud, cold, etc.) and target 65% of mature weight.
Maintain consistency.
It is important for gain patterns to be steady. Don't push early with creep feeds and subsequent grain until steer calves are sold, then forget the heifers. Cattle that are losing weight have poor conception rates. It is important not to burn out heifers and then crash them … all the while expecting them to breed because they are heavy enough. In fact, heifers gaining weight during breeding are far more successful at conceiving.
Some producers that are limit-feeding a heifer development ration should consider adding Rumensin to the diet. This has shown to help heifers reach sexual maturity earlier and certainly can help them maintain adequate gains on a limit-fed ration.
Overview
- Do not under-develop heifers.
- Do not over-develop heifers.
- Don’t buy implanted heifers for replacements.
- Don’t implant heifers intended to be replacements.
- Manage heifers apart from bull calves; guard against heifers getting bred aside the cow.
- Consult your vet on proper vaccination; be sure to administer pre-breeding vaccinations.
- Give proper mineral supplementation at all times.
- ID heifers with a tag or tattoo to allow accurate record keeping.
Download the Heifer Selection Fact Sheet.