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Khalid Ibn Elwalid Ahmed Abdoun, PhD, Avh Research Fellow

Professor

Faculty

كلية علوم الأغذية والزراعة
Department of Animal Production, Building 2, Room 2A/11
publication
Journal Article
2020

Direct heat stress-induced effects on rumen fermentation characteristics and nutrients degradability in sheep pair-fed alfalfa hay

AA), Hassan S. Mohamed-Ali (Mohamed-Ali, HS), Khalid A. Abdoun (Abdoun, KA), Emad M. Samara (Samara, EM), Mohamed A. Al-Badwi (Al-Badwi, MA), Aly B. Okab (Okab, AB) and Ahmed A. Al-Haidary (Al-Haidary, . 2020

Abstract
Aim of study: To investigate the direct effect of heat stress on rumen fermentation characteristics and nutrients degradability of pair-fed rams to subsequently eliminate the confounding effects of dissimilar feed intake induced by heat stress exposure.
Area of study: Saudi Arabia.
Material and methods: Five rumen-cannulated desert rams (45 ± 1.63 kg body weight; 2–3 years of age) were placed individually in controlled climatic-chambers to be exposed to two successive periods. The 1st period was a control thermoneutral period (TN; 23.64 ± 0.14 ºC;
extended for 21 days) followed by a 2nd period of heat stress (HS; 44.26 ± 1.70 ºC, for another 21 days). Each period was consisted of a temperature acclimation phase (7 days) and a data collection phase (14 days). Alfalfa hay was offered twice daily during both periods in a pair-fed manner (800 g DM per head and day).
Main results: Exposing pair-fed desert rams to elevated ambient temperature had (p<0.05) elevated their respiration rate and skin temperature, without noticeable (p>0.05) changes in their rectal temperature. Most of the rumen fermentation characteristics and nutrients degradability were not affected by HS (p>0.05). However, exposure to HS increased (p<0.05) pre-feeding rumen total volatile fatty acids concentrations, pre-feeding molar proportion of acetate, and post-feeding rumen osmolality.
Research highlights: HS had no direct effect on post-feeding rumen fermentation characteristics and nutrients degradability in desert sheep. This implies that strategic approaches to mitigate the adverse effects of HS have to be directed towards promoting feed intake and nutrients utilization under such conditions.
Additional key words: body temperature; feed intake; hot climate; rumen ecosystem.

more of publication
publications

Abstract
Aim of study: To investigate the direct effect of heat stress on rumen fermentation characteristics and nutrients degradability of pair-fed rams to subsequently eliminate the…

by Hassan S. Mohamed-Ali (Mohamed-Ali, HS), Khalid A. Abdoun (Abdoun, KA), Emad M. Samara (Samara, EM), Mohamed A. Al-Badwi (Al-Badwi, MA), Aly B. Okab (Okab, AB) and Ahmed A. Al-Haidary (Al-Haidary, AA)
2020
publications

Abstract
Background: Molasses is a potential energy supplement; extensively used to improve growth performance, milk
and meat characteristics in goats at relatively low concentrations…

by Osman A. Osman, Nawal M. Elkhair and Khalid A. Abdoun
2020
publications

Simple Summary: Feeding a pelleted diet under the prevailing water scarcity in arid regions, coupled
with the low moisture content of that diet, raises the question about the precise level…

by Yusuf A. Adeniji , Musafau O. Sanni , Khalid A. Abdoun *, Emad M. Samara, Mohamed A. Al-Badwi, Majdi A. Bahadi, Ibrahim A. Alhidary and Ahmed A. Al-Haidary
2020