Tomorrow’s livestock

Why is it so important to control the fertility of our herds?

  • In suckler farming, theVCI (Calving-Calving Interval) is the 1st economic indicator that explains the income to the breeder.
    • Let’s take the example of a Limousin cattle breeder with 130 calvings/year; a renewal rate of 20% (i.e. 26 heifers kept); a sale of 5 males for breeding; and a supposed sale of 99 steers/year if the average LPI of the herd is 365 days (OBJECTIVE OF ONE calf/cow/year).
    • If the herd’s average LPI is 390 days instead of 365, the farm actually loses €10,320 in sales by not selling 8 grazers over the campaign.
    • Breaking down the calculation :
      • 25 extra days of unproductivity * 99 cows producing grazers = 2,475 days of unproductivity
      • 1 gestation = 291 days on average for Limousin multiparous cows
      • A loss of 8 cumulative gestations in the herd
      • With a 50/50 sex ratio, this represents the loss of 4 male grazers (selling at 350kgs live at 4.2€/kg, figures as at 30/04/2024) and 4 females (selling at 300kgs live at 3.7€/kg, figures as at 30/04/2024).
  • On dairy farms, VIF is also important to control, but in relation to the production level of the cows. For high-producing cows over the long term, it may be preferable to lengthen lactation to reach 410-440 days VIF. However, controlling LPI helps to reduce production costs in dairy cattle farming:
    • Let’s take the example of a standard farm in our area with 60 dairy cows and 25 heifers:
    • Reducing the VIF by one cycle, or 21 days, means cutting the production costs associated with dairy cow reproduction by around €3,500 to €5,000 (€3 to €5/day/cow, depending on the system).
    • Reducing the calving age of heifers by 3 months reduces the production costs associated with breeding heifers by more than €3,000 (€1/day of age at 1st calving).

It’s also possible to reduce the herd’s unproductive time (just as true in suckling as in dairy farming!) by calving heifers earlier, at 30 or 24 months .

This saves you 6 to 12 months of productivity respectively.

  • Based on the previous example for beef cattle, this represents a gain in sales of €20,640 for the sale of 16 additional grazers from a calving at 30 months; and €42,390 for the sale of 33 additional grazers from a 1st calving at 24 months.
  • Breaking down the calculation :
    • 26 heifers kept for renewal * 180 days of productivity gained or 365 days = 4,680 days or 9,490 days of productivity gained
    • 1 gestation = 284 days average at Station de Moussours for a calving period of 24 months
    • This means a gain of 16 to 33 cumulative gestations on the herd, for a1st calving at 24 and 30 months, respectively.
    • With a 50/50 sex ratio, this represents additional sales of 8 male and 8 female grazers sold at 350 and 300kg live weight, for1st calving at 30 months; and 16 males and 17 females for calving at 24 months.

To sum up (based on our examples):

What tools can we use to give us peace of mind when calving?

What methods can help us manage the reproduction of our females?

What techniques can I use to significantly increase the genetic level of my herd?

mineral supplementation: essential for optimizing fertilization and calving