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376544

SEASONAL RHYTHMS OF CUTANEOUS AND RESPIRATORY WATER LOSSES AS MECHANISMS FOR THERMOREGULATION BY DESERT SHEEP AND GOATS

Article

Last updated: 23 Dec 2024

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Miscellaneous

Abstract

The present work was initiated to examine the seasonal rates of evaporative water loss (through skin and respiration) on 5 adult Barki rams and 5 bucks in relation to body temperature Season affected significantly (p < 0.01) both rates of respiratory water loss (RWL) and cutaneous water loss (CWL) in sheep and goats. Considering winter as starting occasion, average indoor relative humidity (RH) and ambient temperature (AT) increased steadily up to summer and then declined slightly in autumn. In both species, the seasonal trend of RWL rate was ascendant with those of RH and AT. At the same time, average CWL of sheep decreased inversely to that of CWL. Such descending trend of CWL was observed in goats only from spring to autumn. Goats showed the lowest rate of CWL in winter in order to minimize the resultant heat loss in the cold season. Consistently, goats in winter could elevate their rectal temperature (RT) more than sheep did (0.7 vs. 0.2°C) from 08.00 to 1400 hr. Goats as well were more tolerant to a mild heat load in summer than sheep as judged by the lower increase in RT (0.2 vs. 0.5°C), regardless of the sheep enhanced more water evaporation than goats did.
Negative ambient-body temperature gradients in sheep and goats pointed to the outward heat flow to the environment over the different seasons with highest rates in winter and lowest ones in summer. In cold winter, positive coat-skin temperature gradients indicated a mechanism of inward heat transfer from a warmer coat surface to skin of sheep and goats. However, it seemed that each species has a particular pattern of thermoregulation

DOI

10.21608/vmjg.1996.376544

Keywords

Evaporative water loss, sheep, goats, thermoregulation

Authors

First Name

AZAMEL

Last Name

A.

MiddleName

-

Affiliation

Division of Animal and Poultry Production, Desert Rescarch Center, Matareya, Cairo, Egypt..

Email

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City

-

Orcid

-

First Name

EL-SAYED

Last Name

A.

MiddleName

-

Affiliation

Division of Animal and Poultry Production, Desert Rescarch Center, Matareya, Cairo, Egypt..

Email

-

City

-

Orcid

-

First Name

EL-SHERIF

Last Name

A.

MiddleName

-

Affiliation

Division of Animal and Poultry Production, Desert Rescarch Center, Matareya, Cairo, Egypt..

Email

-

City

-

Orcid

-

Volume

44

Article Issue

2

Related Issue

50020

Issue Date

1996-04-01

Receive Date

2024-08-27

Publish Date

1996-04-01

Page Start

425

Page End

433

Print ISSN

1110-1423

Online ISSN

2537-1045

Article File

VMJG_Volume 44_Issue 2_Pages 425-433.pdf

PDF . 6.6MB

Link

https://vmjg.journals.ekb.eg/article_376544.html

Detail API

https://vmjg.journals.ekb.eg/service?article_code=376544

Order

376,544

Type

Original Article

Type Code

544

Publication Type

Journal

Publication Title

Veterinary Medical Journal (Giza)

Publication Link

https://vmjg.journals.ekb.eg/

MainTitle

SEASONAL RHYTHMS OF CUTANEOUS AND RESPIRATORY WATER LOSSES AS MECHANISMS FOR THERMOREGULATION BY DESERT SHEEP AND GOATS

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Article

Created At

23 Dec 2024