Production and performance standards established for Holstein heifers, from 6 months of age to freshening, across the United States. (Printable version)
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A. Given calves that are healthy without morbidity from earlier age, total death loss from all conditions, but primarily pneumonia, should be:
- 6 to 12 months of age: <1%
- 12 months to freshening: <0.5%
A. Defining pneumonia as a case of respiratory disease which requires individual animal treatment with an antibiotic (does not include use of feed-grade medication fed with regular ration), target morbidity rates are:
- 6 to 12 months of age: <3%
- 12 months to freshening: <1%
B. Target rates for morbidity (disease condition which requires treatment) from all other causes, including pinkeye, mastitis, heel warts, diarrhea, bloat, BVD, hardware disease and accidental injury are:
- 6 to 12 months of age: <4%
- 12 months to freshening: <2%
III. Growth Rate and Nutrition
A. Target growth rate is 1.7 to 2.0 lbs. average daily gain. Weigh checks should be performed routinely; ideally, at least every three months.
B. Total ration protein content should be:
- 6 to 9 months of age: 15-16%
- 9 to 13 months of age: 14-15%
- 13 months of age to freshening: 13.5-14%
C. Work with a nutritionist to help formulate rations and monitor/consult routinely.
D. Keep the herd veterinarian informed of rations for all ages of heifers.
E. By 13 to 15 months of age, strive to achieve:
- Weight of 825 to 900 pounds
- Hip height of >50 inches
- Wither height of >48 inches
[Or 55% of the weight of mature cows in the herd]
F. Target weight immediately precalving is 1,350 pounds (or 85% of the weight of full-term, pregnant, mature cows in the herd).
G. Target body condition score at freshening is 3.5 (on a 5-point scale).
A. Feeding space
- Target feeding space
a. 6 to 12 months of age: 18 inches per head
b. 12 to 18 months of age: 20 inches per head
c. 18 months of age to freshening: 24 inches per head
d. 3 weeks prior to freshening: 30 inches per head
- Stocking density and pen assignments
a. Free-stall or open-lot housing should provide total bunk space inches to allow all animals to eat at the same time.
b. Feeding systems with headlocks or slants should provide an animal:stall stocking density of 1:1, or be stocked at a rate to accommodate target feeding space above (example: heifers three weeks prior to freshening in 24-inch stalls should be stocked at 80%).
c. Pre-fresh heifers should be housed separately from close-up, adult cows.
B. Housing environment
- Heifers should have protection from direct sunlight any time the Temperature Humidity Index (THI) (Fig. 1) meets or exceeds:
a. 77 for heifers 6 to 12 months of age
b. 72 for heifers 12 months of age to freshening
- Heifers should have shelter from wind and precipitation any time wind chill temperatures (Fig. 2) are 20°F or lower.
a. Heifers 6 to 12 months of age should have overhead shelter in these conditions.
b. Heifers 12 months of age to freshening should have a windbreak in these conditions.
- Housing environment for heifers of all ages always should be clean, dry and draft-free, with good
- Target resting space
a. 6 to 12 months of age: 45 square feet per head, or one free stall per animal
b. 12 to 18 months of age: 50 square feet per head, or one free stall per animal
c. 18 months of age to 2 to 4 weeks pre-freshening: 60 square feet per head, or one free stall per animal
d. 2 to 4 weeks pre-freshening: 100 square feet, or one free stall per animal
- Target free stall space
a. 6 to 9 months of age: 30 x 54 inches
b. 9 to 12 months of age: 34 x 60 inches
c. 12 to 18 months of age: 36 x 69 inches
d. 18 months of age to 2 to 4 weeks pre-freshening: 40 x 84 inches
e. 2 to 4 weeks pre-freshening: 43 x 96 inches
V. Vaccination and Parasite Control
A. Work with a veterinarian, and – in custom-rearing facilities – dairy owners, to develop a vaccination protocol appropriate to the disease challenges of your region and operation.
B. Diseases to consider addressing with vaccination include blackleg; BRSV, brucellosis; BVD (Types 1 and 2); clostridial disease; coronavirus; E. coli mastitis; enteric disease caused by Salmonella; IBR; leptospirosis; papilloma (warts); PI3; pinkeye; pneumonia caused by Pasteurella multocida and Mannheimia haemolytica; rotavirus; trichomoniasis; vibriosis; and other diseases specific to your geographic region.
C. Practice internal and external parasite control based on geography and herd veterinarian's recommendations.
A. Begin breeding at 13 to 15 months of age, with a proper weight of 825 to 900 lb., hip height of >50 inches, and wither height of >48 inches, [or at 55% of the weight of mature cows in the herd] so that heifers freshen at 22 to 24 months of age.
B. At least 30 days prior to breeding, revaccinate all animals with a modified live vaccine.
C. Strive to achieve >70% first-service conception rate with conventional semen and 7 to 12% less with sexed semen.
D. Inseminate at least 80% of animals within the first 21 days of moving to the breeding pen.
E. 85% of heifers should be pregnant after three heat cycles.
F. Pregnancy-check all heifers to confirm pregnancy before removing them from the breeding pen.
VII. Pregnant Heifers
A. Some animals will abort after pregnancy diagnosis. Typical rate is approximately 3%.
B. Run clean-up bulls with pregnant heifers if necessary.
- Perform routine health maintenance on bulls, including vaccination, deworming and breeding
soundness exams, at six-month intervals.
- Rotate and replace bulls as necessary.
C. Reconfirm pregnancies 70-100 days after initial check.
D. Reconfirm pregnancies prior to animals leaving custom-rearing operations, and communicate correct
breeding dates back to the dairy. For heifers raised on site, reconfirm pregnancies before heifers are moved to the pre-fresh pen.
E. Revaccinate 4 to 8 weeks prior to calving when disease pressure is present and to boost colostrum