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AgridianDairy KB

Beef-on-dairy breeding

Definition

Section titled “Definition”

Beef-on-dairy (also beef × dairy, or dairy-beef cross) is the practice of breeding part of a dairy herd to beef sires (most often Angus or other beef breeds) instead of dairy sires. The resulting crossbred calves are sold for beef and are worth more than purebred dairy bull calves.

It is usually paired with sexed dairy semen on the best females:

  • Top-ranked females (often heifers and young cows, ranked by genomic or parent-average index) → sexed dairy semen, to make the replacement heifers.
  • Middle → conventional dairy semen, if needed for replacement numbers.
  • Lower-ranked females, repeat breeders and planned culls → beef semen.

The decision is a replacement-pipeline decision. Every female bred to beef is one fewer chance of a dairy heifer calf. Too much beef and the herd runs short of replacements two to three years later; too little and it raises surplus heifers at a cost.

Formula

Section titled “Formula”

Plain text:

Replacements needed per year  = average cows × annual cull rate (herd turnover)


Dairy heifer calves expected  = dairy-semen pregnancies carried to term × share female × heifer survival to calving


  share female ≈ 0.89–0.90 for sexed semen, ≈ 0.47 for conventional


Beef share of services (%)    = beef services / all services × 100

LaTeX:

R_{\text{need}} = \bar{N}_{\text{cows}} \times c
\qquad
H_{\text{exp}} = P_{\text{dairy}} \times f_{\text{female}} \times s_{\text{calving}}
\qquad
\%\text{beef} = \frac{N_{\text{beef services}}}{N_{\text{all services}}} \times 100

The plan works when expected heifers ≥ replacements needed, with a margin for losses and herd growth. Pregnancies here are those carried to term (after pregnancy loss), and the heifer survival term covers losses from birth to first calving (see heifer survival to calving).

Female shares: 89% of singleton calves from sexed semen were female in US on-farm records (90% for normal-length gestations; DeJarnette et al. 2009). Conventional semen gave 46.7% female singletons in Minnesota DHIA records (Silva del Río et al. 2007).

How to pull it in DC305

Section titled “How to pull it in DC305”

Classify each service by the sire’s breed code (see NAAB sire codes):

EVENTS BRED ID LACT FOR EDAY>-365 \2      breedings with sire, last 12 months
BREDSUM\Z FOR LACT>0                      conception rate by breed of sire
BREDSUM\S FOR LACT>0                      conception rate by service sire
BREDSUM\* FOR LACT>0                      conception rate by semen type (sexed vs conventional)
BREDSUM\YZ                                heifers, by breed of sire

\Z (breed of sire) separates beef from dairy services directly when the sire list carries each bull’s breed. Otherwise group sires as beef, sexed dairy, conventional dairy or unknown, and count services and pregnancies in each group, separately for heifers and cows.

For calves, the herd’s calving entries record the calf’s sex and often its breed or a beef-cross flag (in a remark, a calf item or a separate event). How this is recorded varies by herd; map it in the herd’s private dc305-vocab page.

Typical range

Section titled “Typical range”

Herd context: US Holsteins, freestall or dry-lot, AI breeding with genomic or index ranking of heifers.

Measure Typical in herds using beef-on-dairy
Beef share of all cow services 25–50%+
Beef share of heifer services 0–20% (heifers usually get sexed dairy)
Conception rate, beef vs dairy sires (same group) similar (raw beef CR slightly lower, partly from use on problem breeders)

In US national records, Angus sires bred to Holstein cows averaged 33.8% CR vs 34.3% for Holstein sires, and 53.0% vs 55.3% in Holstein heifers. Beef sires were used more on repeat breeders (mean service number 3.04 vs 2.13 in cows), which explains some of the gap; 95.4% of beef-on-dairy breedings were to Angus (McWhorter et al. 2020).

  • Replacement margin: herds commonly aim for a few percent more heifers than the replacement need, to cover heifer losses and culling.
  • Calf value: the premium for beef-cross calves over dairy bull calves varies widely with the cattle market; don’t quote a fixed figure.

Common mistakes

Section titled “Common mistakes”
  • Breeding too much to beef without running the replacement math; the shortfall shows up two to three years later.
  • Ignoring heifer losses between birth and calving when counting expected replacements.
  • Assuming 100% female from sexed semen.
  • Lumping all sires when comparing conception rate: beef, sexed and conventional semen behave differently, and are used on different females.
  • Counting beef-cross heifers as replacements. Beef-cross females are not dairy replacements and are often excluded from dairy collateral classes.
  • Not recording calf breed, so beef-cross and dairy calves can’t be separated in calf sales and inventory.
  • Small samples by sire. Compare CR with a confidence interval; suppress or flag sires with very few services.
Section titled “Related”