Development and Comparison of Backpropagation and Generalized Regression Neural Network Models to Predict Models to Predict Diurnal and Seasonal Gas and PM10 Concentrations and Emissions From Swine Buildings

Posted in: Environment by admin on January 1, 2008 | No Comments

The purpose of this study was to employ backpropagation neural network (BPNN) and generalized regression neural network (GRNN) techniques to model GPCER generated and emitted from swine deep‐pit finishing buildings as affected by time of day, season, ventilation rates, animal growth cycles, in‐house manure storage levels, and weather conditions. Good results were found which indicated that the artificial neural network (ANN) technologies were capable of accurately modeling source air quality within and from the animal operations. However, it was also found that the process of constructing, training, and simulating the BPNN models was very complex. Thus, the GRNN was characterized as a preferred solution for its use in air quality modeling.

Twenty Three Steps to An Improved Barn Environment

Posted in: Prairie Swine Centre by admin on | No Comments

MANURE MANAGEMENT

1) Repair and replace penning, flooring, etc. which causes spilled water, or manure and urine to lie on floors and alleyways. This raises ammonia and humidity levels in the winter and reduces the room temperature, as it takes energy to evaporate this liquid.
2) Check slats and penning support ledges for locations where manure can build-up. This provides a haven for flies and causes similar problems to 1) above.
3) Never allow manure to build up closer than 12″ to the bottom of the slats. Gas begins to enter the confinement area and effect performance if manure builds up beyond this level.
4) Check for leaks through manure pump out ports, under manure pit dividers, etc. Air entering rooms this way increases gas production from the manure and can cause extreme health problems.
5) Flush manure from gravity flow pits within 15-20 days maximum. Recharge the pits with a few inches of fresh/wash water to absorb ammonia and reduce potential for solids build up.
6) Ensure radiant heat lamps direct heat onto solid pads. Light passing through slats will heat the manure below and increase gas production.

VENTILATION

7) If there is a pit tube/duct ventilation system, be sure to check it periodically for solids/manure build-up.
8) Repair leaking waterers immediately. Keep replacements handy.
9) Verify adequate flow at water nipples to see if there are problems. Check during high flow times. Since 70 % of water is consumed during feeding, morning or late afternoon is best. If some form of water based cooling is used, it will mean the heaviest load occurs during late afternoon; check when the cooling systems is operating.
10) Ensure that the mechanical ventilation system is performing as required. Use a static pressure gauge to adjust air inlets; Set @ 0.04″ in the summer, 0.08″ in the winter.
11) Verify inlet openings are correct with a velocity meter such as the Dwyer High Air Speed Indicator.
12) Ensure inlets are of good quality and properly located to mix fresh air uniformly and reduce drafts.
13) Adjust minimum winter ventilation to achieve a relative humidity (RH)of 50-70% . Too high causes health problems from air-borne pathogens. Too low wastes increase heating costs and can also cause health problems. An inexpensive digital relative humidity instrument is a good device for checking relative humidity as well as temperature.
14) Verify heaters, fans/shutters and controls are all maintained.
15) If air is drawn in from the attic in summer, ensure temperature rise is less than
1.5 0 C. Exterior roof sheathing should be white, or a layer of insulation on the underside of the roof will also help to reduce solar heat gain.
16) Check and maintain insulation levels. It not only reduces heat load on the building, it reduces the thermal environment effects due to reduced radiation (winter) and excessive radiation (summer).
17) Consider some form of cooling appropriate to the type of production room; spray cooling, evaporative cooling pads, stirring fans, tunnel ventilation, earth tube cooling, etc. A 3-7 C 0 cooling benefit with a resulting improved feed consumption is achievable.
18) Monitor temperature with a good quality digital maximum/minimum thermometer in every room. Older style mercury thermometers do not respond quickly enough.

MISCELLANEOUS

19) Ensure pigs receive adequate light for at least 10 h/d (Recommended Code of Practise for the Care and Handling of Farm Animals (Pigs) ). Use fluorescent tube fixtures or high intensity discharge (HID) to achieve this economically. Paint walls and ceilings white. Keep surfaces and lighting fixtures clean to ensure maximum reflectivity.
21) Consider the installation of windows to improve the environment for management. They add very little to heat load and can provide a psychological lift.
22) Install a good quality alarm system. It should be independent of controls, be battery backed up and lightning protected, and managed so that response to alarm is less than 15 minutes. A back up generator or other emergency contingency plan should be well formulated in advance to reduce potential for animal suffering and loss. It should operate off all minimum ventilation fans and hi/low temperature in each room.
23) Conduct a ” Barn Health Audit” on the manure, ventilation, and lighting systems at least every spring and fall. Consider having independent experts out to conduct the audit for you.

Carcass, meat quality, and sensory characteristics of heavy body weight pigs fed ractopamine hydrochloride (Paylean)

Posted in: Meat Quality by admin on | No Comments

Carcass characteristics, meat quality
traits, and sensory attributes were evaluated in latefinishing
barrows and gilts, weighing between 100 to
130 kg of BW, fed 0, 5, or 7.4 mg/kg of ractopamine
hydrochloride (RAC) for the final 21 to 28 d before
slaughter. Carcass data were collected from carcasses
from barrows and gilts (n = 168), and all primal cuts
from the right sides of these carcasses were fabricated
to calculate primal yields as a percentage of the HCW.
Subjective (National Pork Producers Council and Japanese)
color, firmness, and marbling scores were determined
on the LM of each loin and the semimembranosus
muscle (SM) of the ham, whereas the moisture,
extractable lipid, Warner-Bratzler shear force (WBSF),
and trained sensory evaluations (juiciness, tenderness,
and pork flavor) were measured on the LM samples
only. Gilts produced heavier (P < 0.05) HCW than barrows, whereas feeding RAC increased (P < 0.05) HCW over pigs fed diets devoid of RAC. Carcasses from gilts also had greater (P < 0.02) primal cut and lean cut (P < 0.01) yields than barrows, and dietary inclusion of 5 mg/kg of RAC increased (P < 0.05) total boneless cut and lean cut yields when compared with carcass from pigs fed 0 or 7.4 mg/kg of RAC. Warner-Bratzler shear forces values were greater (P < 0.05) in the LM of gilts than barrows, but only juiciness scores were greater (P < 0.03) in LM chops from barrows than gilts. The LM from barrows had greater intramuscular lipid (P < 0.001) than the LM from gilts, and even though the LM from pigs fed 5 mg/kg of RAC had greater (P < 0.04) WBSF values than the LM from pigs fed 0 or 7.4 mg/kg of RAC, including RAC in the late-finishing diets for 21 or 28 d did not affect sensory panel rating or percentages of moisture and intramuscular lipid. In summary, addition of RAC in the late-finishing diet improved carcass and primal cut yields when it was fed at 5 and 7.4 mg/kg without altering pork quality traits regardless of whether RAC was fed for 21 or 28 d.

The effects of digestion temperature and temperature shock on the biogas yields from the mesophilic anaerobic digestion of swine manure

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Information Content in Deferred Futures Prices: Live Cattle and Hogs

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The informational content in live cattle and hog deferred futures prices is assessed using a direct test of incremental forecast ability for two to twelve month horizons. For 1976-2007, the results indicate that hog futures prices add incremental information at all horizons, but unique information in live cattle prices declines quickly beyond the eight-month horizon with no incremental information at the twelve month horizon. The contrast in performance is likely attributable to differences in the quality of public information and the nature of production process.

Effect of driver and driving style on the stress responses of pigs during a short journey by trailer

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During transportation to an abattoir, pigs can be exposed to a variety of different stressors, eg temperature change, noise and sudden movements (acceleration, braking, cornering) (Lambooij & van Putten 1993). Vibration and unfamiliar movements of the vehicle might elicit a stress response (Dantzer & Mormède 1983; Geers et al 1994). The cardiovascular system is influenced by vibration, resulting in increased heart rate and blood pressure, and peripheral vasoconstriction (Randall et al 1995a). The stress caused by transport may adversely affect animal welfare and cause economic losses related to mortality, carcass damage, and decreased meat quality (Tarrant 1989; Warriss et al 1994). The motion of the floor surface in a transporter is dependent upon the vehicle’s suspension, load, floor rigidity, engine speed, transmission, road speed, road surface, wheel imbalance, etc. Aspects such as acceleration, braking, and cornering, which are under the control of the driver, affect an animal’s ability to maintain postural stability (Randall 1992; Randall et al 1995b). Since 1990 French drivers transporting pigs have undergone education (two-day sessions organised by ITP, Institut Technique de Porc, Paris, France) to help stress that good handling practices are important, not only from an economic point of view, but also in terms of public perception, ie the image consumers have of pig production. After these training sessions started, many slaughterhouses recorded decreased levels of skin damage (Chevillon 1998). The aim of this study was to investigate the possibility of reducing transported pigs’ stress levels by adjusting the driving style of different drivers. To this end, the effect of driver and driving style on pigs’ stress parameters such as behaviour, salivary cortisol concentrations, and heart rate variability was explored during a short journey. Additionally, the effect of different types of trailer acceleration (longitudinal, lateral, and vertical) on these variables was investigated. One hundred and thirty-five cross-bred pigs (Pietrain × Hypor) were transported in groups of five on a trailer towed by a jeep. Three different drivers transported the pigs using a normal, a quiet, and a wild driving style (the latter two in relation to their normal style). Driving style mainly had an effect on the longitudinal and lateral accelerations. Salivary cortisol increases were lowest for the wild driving style. The latter can be explained by the shorter duration of these journeys and not by the accelerations, thus it is our view that acceleration due to manoeuvring as opposed to acceleration due to overall speed should be avoided. Also, in practice, journeys should take as brief a time as possible. Increasing acceleration saw an increase in the proportion of pigs standing during the journey and a decrease in the proportion of pigs lying down. Measurements of variability in heart rate revealed that lateral acceleration was an important stressor for pigs. We concluded that, as driving style has an effect on different stress variables, increased driver awareness of the effects of their driving on the responses of pigs, would improve pig welfare.

For more information the full article can be found at http://www.tandfonline.com/loi/haaw20

Effects of pre-weaning exposure to a maze on stress responses in pigs at weaning and on subsequent performance in spatial and fear-related tests

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Learning, memory and regulation of the stress response are mediated by the hippocampus. Biologically
relevant hippocampal-dependent tasks that develop and integrate cognitive processing of this region may
not be available to piglets in some current production systems. Additionally, weaning piglets at less than two
weeks of age may make them particularly vulnerable to disruptions during cognitive development. We
measured the effects of a spatial maze task (MT) on the stress response of piglets at weaning (12 days of age)
and subsequent fear response (at 7 weeks of age). Twenty-seven pigs from four litters were assigned to one
of three treatments: maze task (MT), isolation control (IC), or control with sow (SC), then combined into
same sex groups with each treatment represented. Each group was tested four times per day from 5–11 days
of age. MT piglets navigated the MT in order to return to the home farrowing crate containing the sow and
litter. IC piglets were isolated for the same length of time taken for the MT piglet in their group to navigate
the MT. SC piglets controlled for handling and were returned to sow as MT entered the MT. Saliva was
collected immediately pre- and post-MT on day 11 to measure cortisol concentrations, which were lower
pre-MT (F(1, 8) = 5.65, P = 0.04). Weaning at 12 days of age increased cortisol concentrations 2 h postweaning
(F(4, 75) = 5.67, P < 0.001). When exposed to a modified Morris water maze (MWM), a
significant interaction of sex and treatment was found with MT males and IC females faster at solving
the MWM than male IC pigs (x2(2) = 9.14, P = 0.01). Lower cortisol concentrations were seen pre-water
maze versus post-water maze (F(1, 19) = 27.62, P < 0.001). At 50 days of age, fear response of pigs was
examined using three fear-related tests (open field test (OFT), novel object test (NOT), and human approach test (HAT), each consisting of 1 m acclimation and 4 m testing. In the HAT, MT animals had a tendency to
touch the unfamiliar person more quickly (F(2, 19) = 2.51, P = 0.10), and more times than animals in other
groups (F(2, 49) = 6.31, P = 0.008). MT may result in less fear of novel persons and ameliorate cognitive
deficits in male pigs, suggesting benefits of exposing young pigs to environments requiring spatial learning.

For more information the full article can be found at http://journals.elsevierhealth.com/periodicals/applan/issues

Effect of controlled alterations in maternal dietary retinol on foetal and neonatal retinol status and pregnancy outcome in pigs

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The objectives of this research were to determine whether alterations in maternal retinol levels during pregnancy programme later foetal and neonatal retinol status and organ development and to determine whether lowered retinol during early or late pregnancy has a greater effect on later development. In addition, the study provided an opportunity to determine whether such dietary modifications affect pregnancy outcomes such as birth weight and within-litter variation in piglet size. The data found indicated that, in the experimental population of animals studied, modest reductions in vitamin A status reduced the incidence of low birth weight piglets and within-litter variability in birth weight pose the intriguing possibility that alterations in dietary retinol could be used to improve pregnancy outcome. This possibility warrants further examination in a larger study.

For more information the full article can be found at http://www.journals.elsevierhealth.com/periodicals/livsci

A regional evaluation of the effect of fiber type in gestation diets on sow reproductive performance

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Data was collected at 3 research stations to determine the effects of added psyllium or soybean hulls to gestation diets on reproductive performance of sows and preweaning performance of their pigs. It was found that sows fed soybean hulls during gestation had reduce BW compared with sows fed the control diets. Also, sows fed psyllium had an increased BW.

Survival analysis of preweaning piglet survival in a dry-cured ham-producing crossbred line

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This study investigated piglet preweaning survival and its relationship with a total merit index (TMI) used for selection of Large White terminal boars for dry-cured ham production. Relationships between sire rankings obtained from different survival models were high. The heritability estimate in equivalent scale was low. The expoitable genetic variation for this trait justifies the inclusion of piglet preweaning survival in the current breeding program.