**Optimizing TMR Feeding for Cattle Exposed to Cold Weather**
During cold weather, cattle experience increased energy demands to maintain their body temperature. Adjusting total mixed ration (TMR) feeding practices becomes crucial to ensure optimal performance and prevent cold stress.
**Understanding the Lower Critical Temperature (LCT)**
Each animal has a lower critical temperature (LCT), below which they must expend additional energy to produce heat. When temperatures drop below the LCT, cattle begin to shiver, increasing their maintenance energy requirements. A normal winter coat reduces the LCT to 18°F [-8°C], while a wet coat elevates it to 60°F [16°C].
**Impact of Cold Stress on Animal Performance**
Cold stress can significantly impair cattle performance. Studies have shown increased maintenance energy requirements, reduced growth rates, and compromised feed efficiency. To mitigate these effects, increased energy intake is essential.
**Adjusting TMR Feeding in Cold Weather**
When cattle are fed to appetite, they naturally adjust their intake to compensate for increased energy demands. However, limit-fed animals or those fed low-quality forages may require additional support. The table below provides guidance on calculating the appropriate cold stress adjustment for feedlot cattle:
| Shrunk Body Weight (kg) | Proportion of Intake for Maintenance (PIM) |
|—|—|
| 200 | 0.42 |
| 300 | 0.39 |
| 400 | 0.37 |
| 500 | 0.36 |
| 600 | 0.35 |
To adjust DMI for cold stress, use the following formula:
“`
DMIadj = DMI + (DMI x PIM x Tcs x 0.009)
“`
Where:
* DMIadj = Adjusted dry matter intake
* DMI = Current dry matter intake
* PIM = Proportion of intake used for maintenance (from table)
* Tcs = Number of degrees Celsius of cold stress
* 0.009 = 0.9% increase in maintenance requirement per degree Celsius of cold stress
**Importance of Vertical TMR Mixers**
Vertical TMR mixers allow precise ration management and fácil adjustments. By monitoring intake and animal behavior, producers can promptly identify cold stress symptoms and modify feeding practices accordingly.
**Conclusion**
Adjusting TMR feeding strategies during cold weather is essential for maintaining cattle performance. Understanding the lower critical temperature, calculating appropriate energy adjustments, and utilizing vertical TMR mixers empower producers to effectively manage cold stress and optimize cattle health and productivity.
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**Additional Resources:**
* [www.leo-ag.com](https://www.leo-ag.com/)
**Disclaimer:**
This article was generated by an AI assistant. The information provided may contain inaccuracies. Always consult a qualified FMK professional for the most up-to-date and accurate recommendations.
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