scholarly journals The dependence of the productive qualities of pigs on the ventilation system of the premises during the suckling period of their cultivation

2020 ◽  
pp. 76-83
Author(s):  
S. Zhyzhka ◽  
M. Povod
Keyword(s):  
Growth Rate ◽  
Negative Pressure ◽  
Ventilation System ◽  
Uniform Pressure ◽  
Suckling Period ◽  
Negative Pressure Ventilation ◽  
Young Pigs ◽  
Key Words Ventilation ◽  
Room Ventilation System ◽  
Comprehensive Indicator

The dependence of the growth rate, the safety of young pigs in growing and fattening and their feeding qualities on the ventilation system of negative and uniform pressure in the suckling period of their cultivation was studied. We have found that the growth rate of piglets, and their payment of feed by growth during rearing, did not depend on the design features of the room ventilation system during suckling period. We have established some better preservation of piglets in growing with an unchanged ventilation system in the suckling and growing periods. It was revealed the tendency to insignificantly improve of the growth rate and feed payment by growths in piglets, which were grown during ventilation with uniform pressure in the suckling period. It was found that pigs that were raised during the suckling period with a uniform pressure ventilation system reached a mass of 100 kg at the age of 158.4 days, while their counterparts that were raised at that time with a negative pressure ventilation system reached the age of 159.8, that is later on 1, 4 days, or 0.88%. It wasn’t found a significant dependence of the feeding qualities of pigs on the ventilation system of the premises during the suckling period of their cultivation. There was a tendency to a slight improvement in the safety index by 1.9% in animals that were kept in the suckling period with a uniform pressure ventilation system, compared with analogues that were raised during this period with negative pressure ventilation. According to the calculation of the index of feeding qualities according to the formula M.D. Berezovsky, a comprehensive indicator of feeding qualities in animals that were raised during the suction period with uniform pressure ventilation was 21.4% higher compared to peers that were kept during negative pressure ventilation. In general, the growth rate of pigs during rearing and fattening, their safety during these periods and fattening qualities did not significantly depend on the ventilation system of the premises during the suction period of their rearing. Key words: ventilation, microclimate, sow, pig, multiplicity, growth, safety.

scholarly journals RESULTS OF INSPECTION OF THE STATE OF PROVIDING THE MICROCLIMATE IN THE PIG FARM WITH A NEGATIVE PRESSURE VENTILATION SYSTEM

2021 ◽  
pp. 168-177
Author(s):  
Vitalii Yaropud ◽  
Yelchin Aliyev
Keyword(s):  
Air Temperature ◽  
Negative Pressure ◽  
Cooling System ◽  
Ventilation System ◽  
Air Cooling ◽  
Negative Pressure Ventilation ◽  
Normal Limits ◽  
Air Supply ◽  
Air Cooling System ◽  
Pig Farm

The most popular microclimate system today is based on a negative pressure ventilation system. Because it is easier to use and consumes less energy than any other forced ventilation system. The purpose of the research is to inspect the room for keeping piglets on rearing with a negative pressure ventilation system to identify shortcomings and deviations of the microclimate parameters necessary for further improvement. According to the results of the inspection of the rearing room for piglets, it was found that according to the existing system of negative pressure in the rearing room for piglets, most indicators (air velocity, ammonia, carbon dioxide, hydrogen sulfide, oxygen) are within normal limits. According to the results of the inspection of the room for keeping piglets for rearing with a negative pressure microclimate system, it was found that the air temperature in the room does not meet the recommended limits and reaches 30 °C, while the maximum recommended temperature for piglets for fattening is 20 °C. The air temperature is uneven along the length of the room, which is caused by uneven air supply from the vents. According to the results of the inspection of the room for piglets with a negative pressure microclimate system, it was found that the relative humidity at the height of the animals is higher than the recommended norms and reaches 95%, while the recommended humidity for piglets for fattening is not more than 80%. According to the results of the inspection of the room for keeping piglets for rearing with a negative pressure microclimate system, it can be stated that it is necessary to improve the air cooling system and replan the ventilation ducts of the ventilation system to ensure even air flow.

Live weight and livability of piglets received from sows with different duration of open days period and lactation

2020 ◽  
pp. 50-58
Author(s):  
A. Darin ◽  
A. Busov
Keyword(s):  
Growth Rate ◽  
Production Technology ◽  
Live Weight ◽  
Reproductive Traits ◽  
Theory And Practice ◽  
Suckling Period ◽  
Pork Production ◽  
Young Pigs ◽  
Days Open ◽  
Weaning Piglets

The most important element of pork production technology is the reproduction of the herd. Among all the reproductive traits of sows, there is a special emphasis on the heavy litter or live weight of piglets at birth, which largely determines the growth rate of young animals in further age periods. The livability of piglets ultimately determines how many young pigs will come to fattening and how much pork will be obtained. Therefore, the study of the reproductive traits of pigs is relevant for the theory and practice of pig breeding. The researches have been carried out under the environments of the reproductor of an industrial pig breeding complex, where the infl uence of the duration of the days open period and lactation of sows (suckling period) on their heavy litter and livability of piglets has been studied. The most signifi cant increase in sow fertility has been found, depending on the length of the days open period, when only one heat was missed. In the group of sows when weaning piglets at the age of 18, 21 and 24 days and the duration of the days open period of 21–28 days, the heavy litter was 0,054–0,197 kg more than when using sows with the days open period of 1–7 days. When inseminating sows with the days open period of 45 days or more compared to the group of sows with the days open period of 21–28 days, the increase in their heavy litter has not been observed. For example, the average heavy litter in the group of sows with the days open period of 45 days or more was 0,06 kg less than in sows with the days open period of 21–28 days. On average the groups of sows during insemination in the second heat after weaning piglets have shown the increase in heavy litter and livability of piglets compared to the group of sows without missing the heat. Sows inseminated in the second heat with the days open period of 21–28 days increased by 0.106 kg (P < 0,001) compared to the group of sows without heat missing. The researches have shown the increase in the livability of piglets in the groups of sows with the days open period of 21–24 and 45 days by more than 0,7–2,2 %, compared with the group of sows with the days open period of 1–7 days.

Lack of Nosocomial Spread of Varicella in a Pediatric Hospital with Negative Pressure Ventilated Patient Rooms

1985 ◽  
Vol 6 (3) ◽  
pp. 120-121 ◽  
Author(s):  
John D. Anderson ◽  
Mavis Bonner ◽  
David W. Scheifele ◽  
B. Christof Schneider
Keyword(s):  
Negative Pressure ◽  
Nosocomial Infections ◽  
Immunocompromised Patient ◽  
Ventilation System ◽  
Control Measures ◽  
Pediatric Hospital ◽  
Varicella Zoster ◽  
Negative Pressure Ventilation ◽  
Isolation Facility

AbstractAll patients at the new British Columbia's Children's Hospital with chickenpox or Herpes zoster are nursed with appropriate precautions in single-bed rooms provided with negative pressure ventilation. Over a period of 1 year, no nosocomial infections were detected on follow-up of 110 susceptible patients who had been on wards at the same time as six cases of chickenpox and one immunocompromised patient with cutaneous dissemination of Varicella zoster. In a preceding study at the previous hospital, with similar staff, control measures, and patient population, in an isolation facility without negative pressure ventilation, nosocomial infections occurred in seven out of 41 susceptible patients who were on the same ward as two patients with chickenpox. These findings suggest that a simple negative pressure ventilation system without air locks is a useful adjunct in the control of cutaneous Varicella infections.

Sustained Improvement in Gas Exchange After Negative Pressure Ventilation for 8 Hours Per Day on 2 Successive Days in Chronic Airflow Limitation

1991 ◽  
Vol 144 (2) ◽  
pp. 390-394 ◽  
Author(s):  
Enrique Fernandez ◽  
Paltiel Weiner ◽  
Ephraim Meltzer ◽  
Mary M. Lutz ◽  
David B. Badish ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Negative Pressure ◽  
Airflow Limitation ◽  
Sustained Improvement ◽  
Negative Pressure Ventilation

Negative pressure ventilation decreases inflammation and lung edema during normothermic ex-vivo lung perfusion

2018 ◽  
Vol 37 (4) ◽  
pp. 520-530 ◽  
Author(s):  
Nader S. Aboelnazar ◽  
Sayed Himmat ◽  
Sanaz Hatami ◽  
Christopher W. White ◽  
Mohamad S. Burhani ◽  
...  
Keyword(s):  
Negative Pressure ◽  
Ex Vivo ◽  
Lung Perfusion ◽  
Lung Edema ◽  
Ex Vivo Lung Perfusion ◽  
Negative Pressure Ventilation

THE ONSET OF ALLOMETRIC MAMMARY GROWTH IN THE FEMALE HOODED NORWAY RAT

1953 ◽  
Vol 10 (1) ◽  
pp. 35-45 ◽  
Author(s):  
MARIAN SILVER
Keyword(s):  
Growth Rate ◽  
Anterior Pituitary ◽  
Intact Animal ◽  
Mammary Glands ◽  
Mammary Development ◽  
Female Rat ◽  
Suckling Period ◽  
Intact Female ◽  
Norway Rat ◽  
Endogenous Oestrogen

SUMMARY In order to study the factors involved in the initiation of allometric mammary growth, which occurs at about 3 weeks of age in the intact female rat, an attempt to induce this phase prematurely in the suckling gonadectomized animal by means of oestrogen was made. It was found, however, that the mammary glands were practically insensitive to physiological doses of this hormone during the suckling period unless anterior pituitary (a.p.) extract was also given. The relative mammary growth rate in animals treated with a.p. plus oestrogen from the 10th to 27th day of life was similar to that found in control rats receiving oestrogen alone from the 20th to 36th day, but in the former groups allometry was initiated before the 20th day of life. It is suggested that both the level of endogenous oestrogen secretion and the functional activity of the anterior pituitary may be important in determining the time of onset of allometric mammary development in the intact animal.

Augmentation of phrenic neural activity by increased rates of lung inflation

1981 ◽  
Vol 50 (1) ◽  
pp. 149-161 ◽  
Author(s):  
A. I. Pack ◽  
R. G. DeLaney ◽  
A. P. Fishman
Keyword(s):  
Tidal Volume ◽  
Volume Change ◽  
Neural Activity ◽  
Negative Pressure ◽  
Spontaneous Breathing ◽  
Moving Average ◽  
Constant Flow ◽  
Lung Inflation ◽  
Negative Pressure Ventilation ◽  
Single Breath

Studies were conducted in anesthetized paralyzed dogs using a cycle-triggered constant-flow ventilator, which ventilated the animal in phase with the recorded phrenic neural activity. Intermittently tests were performed in which the animal was ventilated with a different airflow for a single breath. Increased airflows, within the range generated during spontaneous breathing, caused an increased rate of rise of the moving average phrenic neurogram and a shortening of the duration of the nerve burst. The magnitude of the increase in the rate of rise of the neurogram was related to the level of inspiratory airflow. Tests with brief pulses of airflow showed that an increase in the rate of rise of the phrenic neurogram could be produced without inflating the lung above the resting tidal volume of the animal. Similar results were obtained with negative-pressure ventilation and the effects were abolished by vagotomy. This vagally mediated augmentation of phrenic neural output may accelerate the inspiratory volume change in the lung during spontaneous breathing at hyperpneic levels.

scholarly journals Diagnosis and validation by computational fluid dynamics of poultry house with negative pressure ventilation

2019 ◽  
Vol 23 (10) ◽  
pp. 761-767
Author(s):  
Gisele C. de A. Cunha ◽  
José P. Lopes Neto ◽  
Dermeval A. Furtado ◽  
Valéria P. Borges ◽  
Elias A. Freire ◽  
...  
Keyword(s):  
Thermal Comfort ◽  
Negative Pressure ◽  
Environmental Variables ◽  
Fluid Dynamic ◽  
Air Velocity ◽  
Cfd Simulations ◽  
Heterogeneous Distribution ◽  
Poultry House ◽  
Mean Values ◽  
Negative Pressure Ventilation

ABSTRACT Negative pressure ventilation in poultry houses has been used to enable the correction of their internal microclimates, and studies point to the heterogeneous distribution of air along the aviaries and the inadequacy of the environmental variables to the recommended ranges for thermal comfort of adult birds, especially in the hottest hours of the day. This study aimed to diagnose the facilities of a poultry house in the state of Paraíba, Brazil, regarding the distribution of environmental variables and thermal comfort; develop a computational model and validate it for Computational Fluid Dynamic - CFD simulations. Air temperature (Tair), air relative humidity (RH) and air velocity (Vair) data allowed characterizing the internal environment by comparison with the recommended ranges for each variable and by the temperature-humidity-velocity index (THVI). The poultry house does not provide comfort for the housed adult birds, between 12 and 14 h, with THVI indicating alert and Tair, RH and Vair values outside the recommended ranges; the CFD model for the poultry house was validated with Tair averages collected in the field of 27.75 ± 1.35 ºC and simulated of 27.85 ± 0.55 ºC, mean values of RH collected of 83 ± 12% and simulated of 78 ± 3%, and means of Vair collected of 2.35 ± 1.35 m s-1 and simulated of 2.50 ± 1.50 m s-1.

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