New index breeding values for beef breed sires
With the latest breeding value estimation in April, we are introducing two new index breeding values for our beef breed sires. The aim is to increase the profitability of the Beef on Dairy strategy and create targeted added value. More specifically, these are the two new indexes IGN and ISC. The indexes are based on matings of beef breed sires to Holstein and Brown Swiss cows.
David Hauri, Export Sales Manager
IGN – Index Geburt/ Naissance (birth index)
The birth index combines the following three breeding values, with different weightings assigned to each trait:
- Calving ease, 63 %
- Gestation length, 32 %
- Birth weight, 5 %
The aim is to achieve calvings that are as easy and safe as possible in dairy breeds. The higher the IGN value, the more suitable the sire is for use on dairy cows and heifers.
ISC – Index Schlachtkörper/ Carcasse (carcass index)
The carcass index combines the following breeding values:
- Beef deadweight, 36 %
- Beef carcass yield, 19 %
- Beef fat cover, 4 %
- Calves deadweight, 6 %
- Calves carcass yield, 24 %
- Calves fat cover, 11 %
With a total weighting of 59 %, the breeding values for finished cattle carry more weight in the ISC calculation than those for calves, which account for 41 %. The aim of this breeding value is to produce profitable calves that also remain profitable right through to slaughter at the end of the finishing period.
The new index breeding values as a decision-making aid
The background to these two indexes was the fact that, in the past, weaker finishing performance was increasingly being seen in animals selected primarily for easy calving. With the IGN and ISC indexes, breeders now have two new tools to help them choose the right beef breed sire for their breeding strategy. On many dairy farms, calving ease remains the main priority. However, the aim is also to keep an eye on the ISC when selecting sires for dairy cows, so that profitable calves can be produced beyond calving itself. A major advantage of IGN and ISC is that they can be compared across all standard beef breed sires. This means the new index breeding values support not only the choice of the right sire, but also the choice of the right beef breed. They are now available for 🔗Angus, 🔗Limousin, 🔗Simmental Beef and 🔗Original Braunvieh Beef.