Use of alternative tiles in the free-range broilers rearing: thermal environment, productive performance and physiological responses

The present work aims to develop a mathematical model, based on fuzzy set theory, for predicting performance and the physiological responses of piglets raised in the farrowing house with different solar heating systems. To do this, a solar heater prototype was constructed using alternative materials and the heating efficiency was compared with a commercial solar heater system. In order to thermally evaluate the heaters, temperature sensors were installed in the inlet and outlet pipes of each floor and thermal reservoir. The fuzzy system was developed and the variables dry air bulb temperature (Tbs) and relative humidity (RH) of the air were defined as inputs. Based on the input variables, the fuzzy system predicts the productive performance (weight gain - WG) and physiological responses (respiratory rate - RR, rectal temperature –RT, and skin temperature - ST) of piglets raised in an environment with solar heating. Based on the results, the fuzzy model was adequate for predicting the physiological responses and productive performance of piglets, presenting low standard deviation and high correlation with the validation data. This model can be used to assist producers in decision making, especially regarding maintaining animal welfare while the thermal environment changes.

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Behavioral and physiological responses of different genetic lines of free-range broiler raised on a semi-intensive system

Journal of Animal Behaviour and Biometeorology ◽

10.26667/2318-1265jabb.v5n4p112-117 ◽

2017 ◽

Vol 5 (4) ◽

pp. 112-117

Author(s):

Sicília Avelar Gonçalves ◽

◽

Rony Antonio Ferreira ◽

Idalmo Garcia Pereira ◽

Caroline Carvalho de Oliveira ◽

...

Keyword(s):

Physiological Responses ◽

Free Range ◽

Intensive System

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Red yeast (Phaffia rhodozyma) as a source of Astaxanthin and its impacts on productive performance and physiological responses of poultry

World s Poultry Science Journal ◽

10.1017/s0043933919000187 ◽

2019 ◽

Vol 75 (2) ◽

pp. 273-284 ◽

Cited By ~ 3

Author(s):

H.A.M. Elwan ◽

S.S. Elnesr ◽

Y. Abdallah ◽

A. Hamdy ◽

A.H. El-Bogdady

Keyword(s):

Physiological Responses ◽

Phaffia Rhodozyma ◽

Productive Performance ◽

Red Yeast

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Decision Trees for Predicting the Physiological Responses of Rabbits

Animals ◽

10.3390/ani9110994 ◽

2019 ◽

Vol 9 (11) ◽

pp. 994

Author(s):

Patrícia Ferreira Ponciano Ferraz ◽

Yamid Fabián Hernández-Julio ◽

Gabriel Araújo e Silva Ferraz ◽

Raquel Silva de Moura ◽

Giuseppe Rossi ◽

...

Keyword(s):

Decision Making ◽

Decision Trees ◽

Environmental Variables ◽

Thermal Environment ◽

Physiological Responses ◽

Rapid Evaluation ◽

Production Environment ◽

Experimental Database ◽

Tree Models ◽

Data Points

The thermal environment inside a rabbit house affects the physiological responses and consequently the production of the animals. Thus, models are needed to assist rabbit producers in decision-making to maintain the production environment within the zone of thermoneutrality for the animals. The aim of this paper is to develop decision trees to predict the physiological responses of rabbits based on environmental variables. The experiment was performed in a rabbit house with 26 rabbits at eight weeks of age. The experimental database is composed of 546 observed data points. Sixty decision tree models for the prediction of respiratory rate (RR, mov.min−1) and ear temperature (ET, °C) of rabbits exposed to different combinations of dry bulb temperature (tdb, °C) and relative humidity (RH, %) were developed. The ET model exhibited better statistical indices than the RR model. The developed decision trees can be used in practical situations to provide a rapid evaluation of rabbit welfare conditions based on environmental variables and physiological responses. This information can be obtained in real time and may help rabbit breeders in decision-making to provide satisfactory environmental conditions for rabbits.

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Physiological temperature response and embryonic mortality in stressed swine

American Journal of Physiology-Legacy Content ◽

10.1152/ajplegacy.1975.229.6.1471 ◽

1975 ◽

Vol 229 (6) ◽

pp. 1471-1475 ◽

Cited By ~ 38

Author(s):

DE Wildt ◽

GD Riegle ◽

WR Dukelow

Keyword(s):

Thermal Environment ◽

Physiological Responses ◽

Significant Proportion ◽

Temperature Response ◽

Reproductive Function ◽

Embryonic Mortality ◽

Delayed Effect ◽

Short Term ◽

Embryo Survival ◽

Early Gestation

Physiological responses and some aspects of reproductive function were examined in mated female pigs subjected to a short-term heat stress during two intervals of early gestation. Trial 1 control and treated animals experienced temperatures of 24.0 and 40.2 degrees C, respectively, from days 2 through 13 of pregnancy. Trial 2 control and treated pigs were exposed to 23.3 and 40.4 degrees C, respectively, from days 14 through 25 of pregnancy. Both high thermal exposures caused significant increases (P less than 0.05) in rectal temperature. At body temperatures of 41.1 degrees C or above, animals became more active and behavioral patterns erratic. Stressed pigs in both trials exhibited adaptation to the short-term high thermal environment as treatment days progressed. Embryonic mortality in the stressed animals in trial 1 was greater than in controls, with the animals in the former group retaining a normal size litter or losing the entire litter by day of slaughter. A significant proportion (P less than 0.01) of litters from stressed animals contained degenerating fetuses at day 42 of gestation, suggesting a continuous or delayed effect of thermal stress on embryo survival.

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Spatial variability of enthalpy and illuminance in free-range broiler sheds

Revista Brasileira de Engenharia Agrícola e Ambiental ◽

10.1590/1807-1929/agriambi.v25n5p340-344 ◽

2021 ◽

Vol 25 (5) ◽

pp. 340-344

Author(s):

Amélia C. Faustino ◽

Silvia H. N. Turco ◽

René G. C. Silva Junior ◽

Isadora B. Miranda ◽

Italo E. Anjos ◽

...

Keyword(s):

Experimental Design ◽

Spatial Variability ◽

Air Temperature ◽

Spatial Dependence ◽

Thermal Environment ◽

The Other ◽

Air Humidity ◽

Free Range ◽

Relative Air Humidity ◽

Clay Tile

ABSTRACT Free-range broiler producers are concerned with the thermal environment and lighting of their facilities and seek to improve these factors for the increased welfare of their broilers. The objective of this study was to evaluate the spatialization of illuminance and enthalpy in two free-range broiler sheds, one of masonry with a clay tile roof and the other built of wood with a straw roof. The data on air temperature, relative air humidity, and illuminance were recorded between September and October 2018 for five non-consecutive weeks in two periods during the day: morning (9 hours) and afternoon (15 hours). The data were collected at 42 points per shed, spaced 0.40 × 0.75 m. The experimental design was completely randomized in a 2 × 2 factorial scheme, considering two periods and two sheds. Spatial dependence was evaluated using geostatistics and interpolation maps by kriging. The facilities presented strong or moderate spatial dependence for all observed variables and periods. The small edges and lack of management of curtains resulted in the masonry shed having higher illuminance values during both periods. Although it did not present ideal values for a comfortable environment, the wood shed was more thermally efficient.

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Work tolerance and physiological responses to thermal environment wearing protective NBC clothing

Ergonomics ◽

10.1080/00140139608964485 ◽

1996 ◽

Vol 39 (4) ◽

pp. 620-633 ◽

Cited By ~ 16

Author(s):

G. CORTILI ◽

P. MOGNONI ◽

F. SAIBENE

Keyword(s):

Thermal Environment ◽

Physiological Responses

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Effects of air temperature on physiology and productive performance of pigs during growing and finishing phases

South African Journal of Animal Science ◽

10.4314/sajas.v48i4.4 ◽

1970 ◽

Vol 48 (4) ◽

pp. 627-635

Author(s):

R.F. Oliveira ◽

R.H.R. Moreira ◽

M.L.T. Abreu ◽

M.P. Gionbelli ◽

A.O. Teixeira ◽

...

Keyword(s):

Heat Stress ◽

Thermal Comfort ◽

Thermal Environment ◽

Block Design ◽

Carcass Composition ◽

Experimental Unit ◽

Productive Performance ◽

Negative Effects ◽

Randomized Block Design ◽

Final Weight

Thirty-six castrated male pigs were used to determine the influence of thermal environment and reduction of consumption on performance and carcass composition. Animals were housed in two climate chambers. In one, animals were in thermal comfort (TN) (22 °C), and in the other, pigs were under heat stress (HS) (34 °C). Animals were distributed in a randomized block design, making three treatments (TN, HS and animals in thermal comfort with food consumption paired with that observed in HS (PFTN)), with six replicates and two animals per experimental unit. Data were obtained on performance and carcass composition. The weight gains of HS and PFTN animals were reduced by 40.5% and 34.7%, respectively, reflecting a reduction of 13.2% in the final weight of PFTN animals. Triiodothyronine concentration was not affected by heat, but there was an increase in lymphocyte numbers in PFTN animals. The HS and PFTN animals showed lower hot carcass weight. However, there were no effects on hot carcass yield and relative weights of heart, lung and spleen. Heat stress compromised performance. The negative effects of high temperature on pigs include reduction in feed intake and changes in physiology.Keywords: Environment, heat stress, pair feed, pig growth, pig production

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