Key takeaways from the research:
- Respiratory disease at a young age has a negative and lasting impact on the growth
- The average daily gain in the first 2 weeks correlates positively with bodyweight at 6 months of age.
- The average daily gain in the first year has a positive correlation with first lactation yield but average daily gain between 9 and 12 months of age has a negative correlation with first lactation yield
First-year growth has a positive impact on production but growth between 9 and 12 months has a negative correlation with first lactation yield while respiratory disease reduces growth.
Research has shown that the quality of nutrition has a strong influence on pre-weaning growth[1,2,3,4,5,6,7,8,9,10,11] of dairy calves and milk production later in life[1,2,3,4,5,6,7,8,9,10,11]. Respiratory disease can however affect growth negatively[12]. Dr. Volkmann looked at the effect of rearing intensity and disease incidence on the future performance of German Holstein dairy calves[13].
Study design
A group of 2,252 Holstein dairy calves was fed colostrum ad libitum for the first 3 days of life, after which they were fed intensively in the period up to weaning at 9 weeks of age. The calves were weighed at 2, 6 and 9 weeks of age and subsequently every 2 months. Veterinary treatments against diarrhoea and respiratory diseases, first lactation milk yield and lifetime performance were recorded.
Results
Number of treatments for respiratory disease |
Number of calves |
Bodyweight at 6 months |
0 | 2.131 | 203 kg |
1 | 57 | 204 kg |
2 | 15 | 199 kg |
3 | 9 | 198 kg |
4 | 10 | 182 kg |
5 | 8 | 185 kg |
6 | 2 | 199 kg |
7 | 2 | 203 kg |
8 | 18 | 211 kg |
ADG Day 0-14 |
Number of calves |
Bodyweight at 6 months |
93 | 183 kg | |
100-300 g/day | 225 | 188 kg |
300-400 g/day | 242 | 193 kg |
400-500 g/day | 312 | 195 kg |
500-600 g/day | 431 | 198 kg |
600-700 g/day | 399 | 203 kg |
700-800 g/day | 219 | 207 kg |
800-1000 g/day | 183 | 208 kg |
≥ 1000 g/day | 67 | 208 kg |
ADG Day 0-365 |
Number of calves |
Bodyweight after 6 months |
297 | 8.966 kg | |
800-870 g/day | 468 | 9.158 kg |
870-925 g/day | 487 | 9.348 kg |
925-1000 g/day | 451 | 9.152 kg |
≥ 1000 g/day | 191 | 9.706 kg |
ADG Day 0-365 |
Number of calves |
Bodyweight after 6 months |
273 | 9.320 kg | |
625-775 g/day | 458 | 9.396 kg |
775-900 g/day | 508 | 9.314 kg |
900-1000 g/day | 475 | 9.324 kg |
≥ 1100 g/day | 180 | 8.973 kg |
Conclusion
It was concluded that weighing calves up to the age at which they are inseminated is very important. Calves should grow fast during the first 9 months of life but compensatory growth between 9 and 12 months of age should be avoided.
References
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[13] Volkmann, N, Kemper, N. and A. Romer, 2019. Impacts of prepubertal rearing intensity and calf health on first-lactation yield and lifetime performance, Ann. Anim. Sci; 19: 201-214.