As part of the Lactanet database used for genetic evaluations, over 1.5 million new insemination records are added each year. For Holstein females, nearly 30 million breeding records have now been accumulated since 2000. As part of this data, the service sire is recorded, including its breed. Figure 1 shows the trend in terms of the proportion of Holstein females bred by semen grouped into three categories:
- Holstein sires
- Other dairy breed sires, including Ayrshire, Jersey, Brown Swiss, Guernsey, Canadienne and Milking Shorthorn
- Beef breed sires
Figure 1 clearly shows that the percentage of Holstein females bred to sires of another dairy breed has remained very low at roughly 0.5%. Given the stability of this trend, the relationship between the two other trends is completely opposite. Prior to 2005, the use of Holstein semen to breed Holsteins was consistently 98% but this dropped slightly to 96% over the period from 2005 to 2013. More recently, however, the rate of this decreasing trend has been faster to hit 92% for 2018. Based on the data currently available for 2019, which represents approximately 40% of the full year, an all‐time low has been reached with only 89% of Holsteins being bred with Holstein sire semen, and this statistic is expected to be even lower as the year progresses. Figure 1 shows clearly that this decreasing trend of Holstein on Holstein breeding has completely resulted from a simultaneous increased popularity of breeding Holstein females with beef breed sires. The use of beef on dairy was consistently below 3% before 2013 but has now surpassed the 10% level so far in 2019.
What has Changed?
Two major technologies changed the standard thinking and economics of dairy production in recent years. The first was the use of sexed semen to breed the best females in the herd, which translates to a 90% chance of producing a heifer calf from each pregnancy. In the most extreme scenario, the same number of heifer calves can be produced from 55% of the pregnancies if they resulted from sexed semen compared to using 100% conventional semen. Genomic testing is the second new technology with a major impact on dairy production economics. At a current cost of $33 per animal, producers are better able to determine which young heifer calves are not worthwhile raising to enter the milking herd, which then saves significant dollars otherwise spent on rearing costs.
Therefore, dairy producers using some level of sexed semen in the herd have two options available to them. The first includes producing even more heifer calves than needed for herd replacements but then genomic testing an appropriate proportion of them so as to know which to sell at a young age. A second option when using sexed semen to breed the top dams in the herd is to make different breeding choices when mating the poorest cows in the herd. These days, such breeding choices include the use of beef sire semen when there is already no interest in producing a heifer calf replacement from a given dam, and when there is a premium sale price for young calves, either male of female, that are beef x dairy crossbreds.
In the end, there are three economic realities related to breeding decisions that dairy producers need to think about for maximizing their herd profitability:
- It is costly to raise every heifer calf born in the herd, especially when using sexed semen, unless there are plans for herd expansion during the next year or two.
- Genomic testing helps to better identify which heifer calves are not likely to perform well in the milking herd and can be sold at a young age to save on rearing costs.
While it is important to get most cows in the herd pregnant to start another lactation, it is not necessary to produce a heifer calf from all such dams and it may be most economical to breed the poorest cows with beef sire semen to benefit from the premium sale price obtained from beef x dairy crossbred calves.