Background: The characterization of colonization and dynamic changes related to gut microorganisms might be vital, as it presents an opportunity to quantify the co-variation between stocking densities and gut microbiome of dynamic distribution. The objective of this study was to determine the ...

The main considered environmental factors affecting performance of poultry is temperature. Thermal insulation performance of building component is the key factor that affects temperature stability, which is essential to ensure the bird's well-being, maximum productivity and efficient feed...

This study evaluated the effects of housing system (cage versus pen), sex and line cross (EMY1 and EMY2) on meat quality in meat-type chickens. Chickens (n=640) from each line cross (males: females=1:1) were housed in batteries from d 1 to 28. Then, half of them were transferred to indoor floor ...

Perching is a natural behavior of poultry. Considerable research has been done to explore the relationship between group overall perch usage and well-being of laying hens. To quantify the potential cause-effect relationship on individual hens with different health or well-being status (e.g., keel...

Supplementary heat is required when birds do not produce enough heat to maintain adequate air temperature in confined poultry houses in cold climates, and this consists of the largest proportion of building energy consumption. Thus, it is becoming increasingly apparent that the poultry houses need...

The knowledge of bioenergetics and building ventilation rate in intensive livestock housing is important for efficient design and operation of modern animal production facilities. However, information is limited about ventilation performance and house-level heat and moisture production rates of...

The objective of this study was to compare the testicular development, semen quality, and spermatogenic cell apoptosis of roosters reared in colony, single, and large cages. Rohman parental layers (n = 540) were randomly allocated into cages of rearing system groups (135 males and 405 females). The ...

A 42-d feeding trial was conducted to evaluate the effects of stocking density on the growth and health status of juvenile Megalobrama pellegrini. Fish (initial body weight = 0.45 ± 0.01 g) were reared in a flow-through system under five stocking densities: 0.15, 0.24, 0.34, 0.42, and 0.50 kg/m³....

This study is aimed to explore the mechanism of overcrowding stress on the immunity of grass carp Ctenopharyngodon idella. Fish were reared for 120 days at 10 kg/m³ (low stocking density, LSD), 15 kg/m³ (medium stocking density, MSD) and 20 kg/m³ (high stocking density, HSD). The results showed...

Few studies in China and abroad have examined the biosafety of experimental devices for Non-human primate, and the technology is not mature. Non-human primate are usually reared in single cages in an infectious environment. Although this type of cage can effectively isolate infected experimental...