A 10F reduction in nighttime temperature in the nursery pighouse at weaner pighouses saves heating costs without compromising growth performance, according to Lee Johnston and Yuzhi Li of the University of Minnesota Western Research and Extension Center. What is RNT? Under what circumstances is RNT most commonly used? Why are you interested in RNT now? What are the potential benefits and risks? Is RNT useful? Will RNT research not be done in the future? Dental Chair Spare Parts, Dental Valve, Dental Equipment Repair Parts, Three Way Syringe,Dental Plastic Parts, Dental Foot Control Suzhou Escomedical Equipment Co.,Ltd , https://www.escodental.com
Lowering the night temperature (RNT) is very simple. It is to lower Sherwin while the pigs are not active at night and sleep. At this stage, pigs like to lie next to each other, so that it is easier to maintain body temperature, so the temperature can be lowered.
RNT is most commonly used as a weaned pig house. In general, new weaned piglets require relatively high temperatures (over 80F, 26.7C) to ensure comfort and production performance.
Such a high temperature requires expensive heating costs, so if you can reduce Sherwin in a part of the day, you can save considerable costs. RNT technology can also be used in growing pigs and finishing pigs.
How to implement RNT?
Many modern, computer-controlled, indoor environmental controllers allow managers to efficiently set different temperature levels for different times of the day. During the day (07:00 to 19:00) the temperature can be set to "normal" and at night (from 19:00 to 07:00) to a lower temperature. From the daytime temperature to the nighttime temperature, be sure to let the temperature slowly decrease rather than let the controller quickly reduce the temperature.
Researchers in the 1980s have found that RNT is useful for the management of weaned piglets, but this practice has not been widely adopted.
With the high prices of fossil fuels, people are now more interested in this aspect. The temperature change strategy can be easily implemented with a modern indoor environment controller, which has not previously appeared. Modern, high-growth varieties are better adapted to lower temperatures at night than older varieties. Finally, the recent interest in reducing the carbon footprint also encourages producers to reduce the consumption of fossil fuels.
The main advantage is that it can save heating fuel consumption, thereby reducing production costs. The potential major risks are that they may lead to reduced growth rates and growth efficiencies, increased variability in herd productivity, and increased cold-related mortality and morbidity, especially in individuals with low body weight.
Recently, three universities (Mingda, University of Nebraska, and University of Missouri) evaluated the effectiveness of RNT in weaned pigs.
In the RNT pig house, the night temperature set point was lowered by 10F (about 5.610C) from the day, starting at 19:00 and ending at 07:00. The desuperheating measures were implemented seven days after the weaned pigs were transferred, and the piglets were about four weeks old. The temperature of the control group remained constant day and night.
Since the temperature decrease of 10F had no effect on growth performance, the authors planned to go further and reduce the temperature by 15F during the trial, which will be funded by the Minnesota Swine Commission.
In addition, the RNT will be implemented from the fourth day of weaning pigs, and the test will measure the growth performance, heating fuel usage, and behavior of the pigs. The results of this more radical study will be drawn in the fall of 2011.
How to reduce the night temperature of weaned pigs?