Material Type  

 학위논문

 

0016932905

Date and Time of Latest Transaction  

20240214101138

ISBN  

9798379869632

DDC  

658

Author  

Akter, Suraiya.

Title/Author  

Mitigating Heat Stress of Heavy Broilers for Enhanced Performance and Welfare - [electronic resource]

Publish Info  

[S.l.] : North Carolina State University., 2023

Publish Info  

Ann Arbor : ProQuest Dissertations & Theses, 2023

Material Info  

1 online resource(185 p.)

General Note  

Source: Dissertations Abstracts International, Volume: 85-01, Section: B.

General Note  

Advisor: Sayde, Chadi;Classen, John;Oviedo-Rondon, Edgar;Li, Lingjuan.

학위논문주기  

Thesis (Ph.D.)--North Carolina State University, 2023.

Restrictions on Access Note  

This item must not be sold to any third party vendors.

Abstracts/Etc  

요약Modern poultry producers are raising heavier broilers weighing 2.3 to 4.5 kg within a relatively short period of 42 to 63 days in grow-out houses primarily built twenty to fifty years ago to keep up with the high demand. However, due to environmental stresses, producers face challenges maintaining the broiler's performance and welfare while supplying cheaper meat and creating employment opportunities. The challenges are prominent in the Southeastern states of the United States (US), where most poultry facilities are located, because of summer's increased temperature (T) and relative humidity (RH) due to global warming and hurricane seasons. The evaporative cooling systems in this region become inefficient under high RH. In addition, the ventilation design data, i.e., the amount of heat production (HP) and moisture production (MP) by chickens, has yet not be updated for bigger birds than those from fifty years ago. Also, heavy broilers' physiological and behavioral responses to stressful thermal conditions must be understood to help maintain their thermoregulatory status to perform well. Five live broiler experiments in three consecutive summers from 2017-2019 were conducted to obtain the heavy broiler's HP and MP data, broiler's surface temperature (Ts), and behavioral responses. Two dynamic air velocity (AV) treatments (i.e., High and Low) were applied in three chambers per treatment and 44 broilers per chamber from age 35~61 days in hot and humid summer conditions. Capturing thermal images of the Ts of birds, recording videos of their activities, and measuring various environmental parameters such as T, RH, and AV with different sensors were collected during the experiments. Results showed that the average Ts of the broilers was 35.89±2.37 ℃, and the birds exposed to high AV had significantly lower Ts than those exposed to low AV (P0.05). A regression model was developed (R2=0.51) to predict heavy broilers' Ts Modern poultry producers are raising heavier broilers weighing 2.3 to 4.5 kg within a relatively short period of 42 to 63 days in grow-out houses primarily built twenty to fifty years ago to keep up with the high demand. However, due to environmental stresses, producers face challenges maintaining the broiler's performance and welfare while supplying cheaper meat and creating employment opportunities. The challenges are prominent in the Southeastern states of the United States (US), where most poultry facilities are located, because of summer's increased temperature (T) and relative humidity (RH) due to global warming and hurricane seasons. The evaporative cooling systems in this region become inefficient under high RH. In addition, the ventilation design data, i.e., the amount of heat production (HP) and moisture production (MP) by chickens, has yet not be updated for bigger birds than those from fifty years ago. Also, heavy broilers' physiological and behavioral responses to stressful thermal conditions must be understood to help maintain their thermoregulatory status to perform well. Five live broiler experiments in three consecutive summers from 2017-2019 were conducted to obtain the heavy broiler's HP and MP data, broiler's surface temperature (Ts), and behavioral responses.

Subject Added Entry-Topical Term  

Behavior.

Subject Added Entry-Topical Term  

Humidity.

Subject Added Entry-Topical Term  

Feeds.

Subject Added Entry-Topical Term  

Houses.

Subject Added Entry-Topical Term  

Families & family life.

Subject Added Entry-Topical Term  

Metabolism.

Subject Added Entry-Topical Term  

Ventilation.

Subject Added Entry-Topical Term  

Agriculture.

Subject Added Entry-Topical Term  

Meat.

Subject Added Entry-Topical Term  

Cooling.

Subject Added Entry-Topical Term  

Temperature effects.

Subject Added Entry-Topical Term  

Medical research.

Subject Added Entry-Topical Term  

Design.

Subject Added Entry-Topical Term  

Housing.

Subject Added Entry-Topical Term  

Birds.

Subject Added Entry-Topical Term  

Geometry.

Subject Added Entry-Topical Term  

Poultry.

Subject Added Entry-Topical Term  

Animal sciences.

Subject Added Entry-Topical Term  

Atmospheric sciences.

Subject Added Entry-Topical Term  

Individual & family studies.

Subject Added Entry-Topical Term  

Medicine.

Added Entry-Corporate Name  

North Carolina State University.

Host Item Entry  

Dissertations Abstracts International. 85-01B.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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소장사항  

202402 2024

Control Number  

joongbu:643637