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5 Jan 2024 - NTM Unlocked #19

Breed for improved fertility

Fertility is the driver of milk production. It’s simple: no calf, no milk

Poor cow fertility significantly impacts the profitability of your dairy herd. Some costs are obvious, and others are hidden, but they have a huge influence on your bottom line.

Poor fertility results in:

  • More empty days resulting in higher feed costs without any production in return
  • More culling due to infertility, higher proportion of involuntary culling
  • Higher insemination costs
  • Higher veterinary costs
  • Longer lactation and lower profitability
  • Risk of reduced milk yield in the next lactation due to a long dry period
  • Reduced number of heifers for sale

Poor fertility is among the most common reasons for culling in dairy herds. Culling related to poor fertility is always involuntary. 

With a consistent focus on fertility in your breeding strategy, you can increase your profits. Herds with a higher production level can achieve bigger savings from improved fertility because every day without milk costs more.

 

VikingHolstein cow and calf

Daughter fertility index

The Daughter fertility index describes the bull’s daughters’ genetic potential to start or resume the heat cycle after calving, show oestrus, and conceive at insemination. The higher the breeding values, the better fertility his daughters will have.

Traits included in the combined index for daughter fertility index are:

  • Days from calving to first insemination (cows)
  • Days from first to last insemination (cows, heifers)
  • Number of inseminations per pregnancy (cows, heifers)

The daughter fertility index has been part of the Nordic Total Merit (NTM) Index since the 1980s – that’s over 40 years of systematic data collection for daughter fertility. 

Today, 95% of the cows in Denmark, Sweden and Finland contribute to registrations for daughter fertility. The daughter fertility index is calculated based on data from insemination records on heifers and cows from the first three lactations. Data is collected by A.I. technicians and farmers.

VikingRed cow

Breed for improved fertility

How much can you improve your herd’s fertility by using bulls with high genetic levels for the sub-traits in the Daughter fertility index? 

The number of days from the 1st to last insemination for the daughters of a VikingHolstein bull with EBV 120 for the sub-trait ‘Days from 1st to last insemination, cows’ is 37 days. That is 8 days less than the population average.

Dairy cows’ fertility and health are sophisticated systems where everything is interconnected. To improve fertility in your herd, breeding only for better daughter fertility is just a piece of the whole puzzle. To improve reproductive performance, it is necessary to consider other correlated health traits as well.

Traits with the highest correlation with daughter fertility (Holstein): 

  • Longevity 45%
  • General health (reproductive & metabolic diseases) 41%
  • Calving direct 23%
  • Udder health 23%
  • Hoof Health 15%

Use the breeding values for health and fertility traits in NTM to breed more robust and trouble-free cows. With VikingGenetics you boost health and reproductive performance in your herd. 

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Daughter fertility index NTM

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