System Type: 5
Bay of Plenty
Last Update:
21 October 2020

DairyNZ Comment:

21 Oct 2020
  • Some farms are in a position where they choose to have a shorter AB period. These farms will be approaching the time when the AB technician will drive past the gate (maybe for a short period if a SGL AB programme is to be used) and the bulls will get to join the herd. But it’s not quite time to relax completely as there’s still a need to keep an eye on what’s going on. It’s really helpful to record the natural mating’s as well as it helps give a more complete picture of the mating programme. 

    Provided they’ve had a thorough check over in the pre-mating period, the bulls should be ready to step right in and take over from you. However, there are a few things you can do to make sure you get the best result possible.

    • Ensure that there are at least two sexually active bulls with the herd at all times. With smaller herds and good submission and conception rates through the AB period, the 1:30 ratio might mean only one bull is needed, but it’s just not worth the risk to have just the one bull with the herd.
    • Avoid using overly aggressive or dominant bulls. A big part of this is the Health and Safety factor, but a dominant, but less fertile bull can get in the way of good repro results.
    • Swap the bull teams regularly – daily is good, as if there’s an issue its only around for a day.
    • Keep the bulls off concrete yards as the concrete can cause greater hoof wear and can lead to lameness. The bulls quite readily get the hang of staying in the paddock or race.
    • Regularly observe bulls to ensure they are still moving and serving freely and promptly replace those that are having issues. They may just need a spell, but any illness at all will render them infertile for around 60 days – that means they’ll be off the team for the rest of mating.


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  • Date Collected

    21 Oct 2020

  • Soil temp


  • Growth

    108 kgs DM/day

  • APC

    2724 kgs DM/ha

  • Rainfall

    2 mm

  • BCS


  • % in milk

    100 %

  • MS/cow

    2.30 kgs

  • MS/ha

    8.40 kgs

  • MS/ha YTD

    771 kgs

  • Rotation

    21 days

  • MS/cow YTD

    - kgs

  • Nitrogen YTD

    65 kgs/ha

  • Supplements

    4.5 kgs/cow/day

  • Supplements YTD

    726 kgs/cow/day

  • Weight Gain

    - kgs/day

  • Stocking Rate

    3.65 su/ha

  • Crude Protein Level


  • MJME