Production performance and nitrogen flow of Shaver White layers housed in enriched or conventional cage systems

Neijat, M.; House, James D.; Guenter, W.; Kebreab, E.

doi:10.3382/ps.2010-01069

Cited by 18 publications

(12 citation statements)

References 42 publications

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“…However, AMC concentrations for PMAs 4 to 6 were between 0.56 and 0.58 ppm greater than those for PMA 7 and 8. These results do not agree with those reported by Neijat et al [ 62 ], which state that when manure is compacted (as in piles) the moisture content is greater than when it is dispersed in a thin layer, with more surface contact with the air, which promotes drying and therefore reduces NH 3 volatilization. It is important to take into account that usage of wood shavings or other material to counter humidity was low during PMA 2.…”

Section: Resultscontrasting

confidence: 85%

Semiparametric Modeling of Daily Ammonia Levels in Naturally Ventilated Caged-Egg Facilities

2016

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Ammonia concentration (AMC) in poultry facilities varies depending on different environmental conditions and management; however, this is a relatively unexplored subject in Colombia (South America). The objective of this study was to model daily AMC variations in a naturally ventilated caged-egg facility using generalized additive models. Four sensor nodes were used to record AMC, temperature, relative humidity and wind speed on a daily basis, with 10 minute intervals for 12 weeks. The following variables were included in the model: Heat index, Wind, Hour, Location, Height of the sensor to the ground level, and Period of manure accumulation. All effects included in the model were highly significant (p<0.001). The AMC was higher during the night and early morning when the wind was not blowing (0.0 m/s) and the heat index was extreme. The average and maximum AMC were 5.94±3.83 and 31.70 ppm, respectively. Temperatures above 25°C and humidity greater than 80% increased AMC levels. In naturally ventilated caged-egg facilities the daily variations observed in AMC primarily depend on cyclic variations of the environmental conditions and are also affected by litter handling (i.e., removal of the bedding material).

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Section: Resultscontrasting

confidence: 85%

Semiparametric Modeling of Daily Ammonia Levels in Naturally Ventilated Caged-Egg Facilities

2016

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“…Details on the experimental design for this study have been previously reported (Neijat et al, 2011). In brief, Shaver White pullets, obtained from Manitoba Perfect Pullets Ltd. (Rosenort, MB, Canada), were stocked at a commercial level (4,836 hens) from the age of 19 wk in cages under semicontrolled environmental conditions and were provided with 15 h of light/day.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, overall mean manure Ca excretion was found to be significantly lower in the EC than CC birds (2.11 vs. 2.29 ± 0.04 g/hen per day, respectively; P < 0.01). This was based on analyzed manure output for EC and CC hens (34.1 vs. 31.0 ± 0.32% DM output, respectively; P < 0.0001; Neijat et al, 2011).…”

Section: Calcium Balance/retention and Excretion In Manurementioning

confidence: 99%

“…Measurements and sampling were taken in the middle of the 28-d period for 5 consecutive days for each of the 11 periods. Sampling for hen daily egg production, egg weight, and feed disappearance was conducted according to Neijat et al (2011). Feed disappearance included a component of feed wastage, and disappearance was calculated in the middle of each period as the difference between feed offered and the final weigh back over a 5-d span.…”

Section: Diet and Sample Collectionmentioning

confidence: 99%

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Calcium and phosphorus dynamics in commercial laying hens housed in conventional or enriched cage systems

Neijat¹,

House

Guenter³

et al. 2011

Poultry Science

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Calcium (Ca) and phosphorus (P) dynamics in Shaver White hens (19-63 wk of age) were compared between enriched (EC) and conventional cage (CC) systems. Calcium and P intake and their levels in egg components and excreta were considered. Using commercial levels of production (4,836 hens), 10 test cages/system (24 hens/test cage) were used as replicate units. Enriched cages provided a nesting area, scratch pad, perches, and more floor space (643 cm(2)/hen ) than CC (468 cm(2)/hen). All birds were offered similar phase-fed diets based on wheat-soybean formulation and housed under semicontrolled environmental conditions for 11 periods (28 d each). Egg weight, production, and shell quality indices (egg specific gravity, shell weight, thickness, and percentage shell) were also measured. Data were analyzed as a repeated measures design using the MIXED procedure of SAS. Egg production, weight, and shell quality measurements were not significantly different between the 2 systems. On a DM basis, EC hens exhibited lower feed disappearance than CC hens (92.5 vs. 95.0 ± 0.61 g/hen per day, respectively; P < 0.01), and lower Ca and P excretions in manure compared with CC hens (Ca: 2.11 vs. 2.29 ± 0.04 g/hen per day, respectively; P: 0.619 vs. 0.643 ± 0.005 g/hen per day, respectively; P < 0.01). Even though eggs from EC compared with CC had lower Ca deposition (2.07 vs. 2.13 ± 0.01 g/hen per day, respectively; P < 0.0001) and output (38.3 vs. 38.8 ± 0.15 mg/g of egg, respectively; P < 0.05), both EC and CC systems exhibited similar Ca outputs in eggs when expressed as a proportion of Ca intake (56.5 vs. 56.6 ± 0.51% Ca intake, respectively). The overall mean P retention between EC and CC hens was not significantly different (-7.22 vs. -7.45 ± 0.71% P intake, respectively), but Ca retention was higher in EC than CC hens (-1.37 vs. -4.76 ± 0.89% Ca intake, respectively; P < 0.05). In addition to providing environmental enrichment, EC systems may help to reduce Ca and P excretions when compared with CC systems, thereby improving the utilization of these nutrients.

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“…For laying hens, nitrogen balance flows determined recently (2011) in hens smaller than French laying hens provided the following orders of magnitude: for a mean ingestion of 3 g of nitrogen/day, 20% are retained by the animal, 33% are exported into eggs and 65% are excreted in droppings. A well-balanced diet significantly increases the retention rate of ingested proteins as several studies have shown a reduction of nitrogen excretion of up to 40% (Neijat et al, 2011).…”

Section: Poultrymentioning

confidence: 99%

Origin, quantities and fate of nitrogen flows associated with animal production

Delaby

Dourmad

Béline³

et al. 2014

Advances in Animal Biosciences

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Production performance and nitrogen flow of Shaver White layers housed in enriched or conventional cage systems

Cited by 18 publications

References 42 publications

Semiparametric Modeling of Daily Ammonia Levels in Naturally Ventilated Caged-Egg Facilities

Semiparametric Modeling of Daily Ammonia Levels in Naturally Ventilated Caged-Egg Facilities

Calcium and phosphorus dynamics in commercial laying hens housed in conventional or enriched cage systems

Origin, quantities and fate of nitrogen flows associated with animal production

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