is part of the Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them. Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

  • American Agriculturist
  • Beef Producer
  • Corn and Soybean Digest
  • Dakota Farmer
  • Delta Farm Press
  • Farm Futures
  • Farm Industry news
  • Indiana Prairie Farmer
  • Kansas Farmer
  • Michigan Farmer
  • Missouri Ruralist
  • Nebraska Farmer
  • Ohio Farmer
  • Prairie Farmer
  • Southeast Farm Press
  • Southwest Farm Press
  • The Farmer
  • Wallaces Farmer
  • Western Farm Press
  • Western Farmer Stockman
  • Wisconsin Agriculturist
Focus on replacement heifer nutrition post-breeding

Focus on replacement heifer nutrition post-breeding

Studies show replacement heifers benefit from careful post-breeding management

With the replacement heifer breeding season quickly approaching, South Dakota State University animal science specialist Julie Walker and SDSU beef reproduction specialist George Perry advise that beef producers should pay more attention to post-breeding replacement heifer management.

Related: Replacement Heifers: Raise, Buy or Sell?

To begin, replacement heifers should have a body condition score of 5 or 6 and range between 55% and 65% of their mature weight.

Research conducted at SDSU provides some insight on the importance of post breeding management, especially following artificial insemination, Perry and Walker write:

Studies show replacement heifers benefit from careful post-breeding management

"Previous research (Perry et al., 2013) has indicated that moving drylot-developed heifers to spring forage immediately after AI adversely affected ADG and AI conception rates. However, after 27 days of grazing there was no difference in ADG between heifers developed in a drylot and heifers developed on forage."

More research (Salverson et al., 2009) reported that when replacement heifers were moved from drylot to range, they lost weight (3.5 lbs/day) during the first week whereas range-developed heifers gained weight (2.0 lbs/day).

Related: Good Cows, Replacement Heifers will 'Pay Their Rent'

Perry and Walker note that heifers' grazing skills and dietary habits are acquired early in life, and this learning is important to develop the motor skills necessary to harvest and ingest forage.

They recommend that animals are allowed to increase their consumption of grazed forage to meet nutrient needs.

ON PAGE 2: Research - grazing replacement heifers after breeding >>


Grazing replacement heifers post-breeding
Two studies were conducted at SDSU to determine the impact of adaptation to grazing on weight change and activity when replacement heifers were moved to spring forage and whether supplementing heifers when moved to pasture following AI improved pregnancy success.

Perry and Walker explain:

Experiment 1 was conducted to investigate if heifer development management could impact grazing behavior. Sixty-nine drylot developed heifers were randomly allotted to one of two treatments: 1) heifers remained in the drylot, or 2) heifers were moved to graze spring forage during 42 days.

Planning for all possibilities is the best way to prepare for a successful calving season. But do it right! Download our free report, Best Practices for a Successful Calving Season, to ensure you have everything in place to limit stress on you and your herd.

Daily activity was measured by steps per day. Heifers that were grazing spring forage took more steps per day compared to heifers in the drylot. However, following being moved to spring pasture, heifers that remained in the drylot increased activity compared to those with previous experience grazing spring forage. This is significant because energy requirements increase with activity. (See results below)

Focus on replacement heifer nutrition post-breeding

In the second experiment, 301 drylot-developed heifers were synchronized with the 7-d CIDR protocol. Heifers were either moved to pasture at AI, or moved to pasture and supplemented (5 lbs per head per day of DDGs).

Supplementation increased pregnancy success compared to non-supplemented replacement heifers (76% and 61%, respectively). The results show that post breeding management can affect performance and activity, the specialists note.

"Management options that provide an adaption period for heifers prior to the breeding season or supplementation when heifers are moved to pasture can allow for increased reproductive efficiency," they wrote.

Adapted from: Replacement Heifers Post Breeding Management, SDSU iGrow

Hide comments


  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.