Nutritional Strategies to Alleviate Heat Stress in Sheep

Dunshea, Frank R.; Gonzalez-Rivas, Paula A; Hung, Alex; DiGiacomo, Kristy; Chauhan, Surinder S.; Leury, Brian J; Celi, P.; Ponnampalam, Eric N.; Cottrell, Jeremy J.

doi:10.1007/978-981-10-4714-5_18

Cited by 9 publications

(5 citation statements)

References 65 publications

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“…While these concerns are really only an issue for inorganic forms of selenium, there are blanket limits on all forms of selenium. Due to these reasons, researchers around the world are searching for antioxidants of natural origin or feeds containing natural antioxidants for animal production on farm and post farm food preservation [ 47 , 48 ]. In the last two decades, there has been remarkable changes in the development of biomarkers of oxidative stress and prevention of diseases in human.…”

Section: Development Of Reactive Oxygen Species and Oxidative Stress ...mentioning

confidence: 99%

The Importance of Dietary Antioxidants on Oxidative Stress, Meat and Milk Production, and Their Preservative Aspects in Farm Animals: Antioxidant Action, Animal Health, and Product Quality—Invited Review

Ponnampalam

Kiani

Santhiravel

et al. 2022

Animals

114

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The biological effects of oxidative stress and associated free radicals on farm animal performance, productivity, and product quality may be managed via dietary interventions—specifically, the provision of feeds, supplements, and forages rich in antioxidants. To optimize this approach, it is important first to understand the development of free radicals and their contributions to oxidative stress in tissue systems of farm animals or the human body. The interactions between prooxidants and antioxidants will impact redox homeostasis and, therefore, the well-being of farm animals. The impact of free radical formation on the oxidation of lipids, proteins, DNA, and biologically important macromolecules will likewise impact animal performance, meat and milk quality, nutritional value, and longevity. Dietary antioxidants, endogenous antioxidants, and metal-binding proteins contribute to the ‘antioxidant defenses’ that control free radical formation within the biological systems. Different bioactive compounds of varying antioxidant potential and bio-accessibility may be sourced from tailored feeding systems. Informed and successful provision of dietary antioxidants can help alleviate oxidative stress. However, knowledge pertaining to farm animals, their unique biological systems, and the applications of novel feeds, specialized forages, bioactive compounds, etc., must be established. This review summarized current research to direct future studies towards more effective controls for free radical formation/oxidative stress in farm animals so that productivity and quality of meat and milk can be optimized.

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Section: Development Of Reactive Oxygen Species and Oxidative Stress ...mentioning

confidence: 99%

The Importance of Dietary Antioxidants on Oxidative Stress, Meat and Milk Production, and Their Preservative Aspects in Farm Animals: Antioxidant Action, Animal Health, and Product Quality—Invited Review

Ponnampalam

Kiani

Santhiravel

et al. 2022

Animals

114

View full text Add to dashboard Cite

show abstract

“…There would also be changes in forage conservation strategies (balance between silage and hay in different regions) and increasing the amount of forage conserved to cope with extreme events (Bernardes et al 2018). As countries warm up, systems may adapt by modifying feeding times to avoid warmer hours of the day, increasing the energy density of diets to reduce heat production and incorporating shade through strategic tree planting to reduce the risk of heat stress (Dunshea et al 2017). Improving grazing management (i.e.…”

Section: Strategic Supplementation Of Methane-mitigating Feed Additivesmentioning

confidence: 99%

Key traits for ruminant livestock across diverse production systems in the context of climate change: perspectives from a global platform of research farms

Rivero

López‐Villalobos

Evans

et al. 2021

Reprod. Fertil. Dev.

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Ruminant livestock are raised under diverse cultural and environmental production systems around the globe. Ruminant livestock can play a critical role in food security by supplying high-quality, nutrient-dense food with little or no competition for arable land while simultaneously improving soil health through vital returns of organic matter. However, in the context of climate change and limited land resources, the role of ruminant-based systems is uncertain because of their reputed low efficiency of feed conversion (kilogram of feed required per kilogram of product) and the production of methane as a by-product of enteric fermentation. A growing human population will demand more animal protein, which will put greater pressure on the Earth’s planetary boundaries and contribute further to climate change. Therefore, livestock production globally faces the dual challenges of mitigating emissions and adapting to a changing climate. This requires research-led animal and plant breeding and feeding strategies to optimise ruminant systems. This study collated information from a global network of research farms reflecting a variety of ruminant production systems in diverse regions of the globe. Using this information, key changes in the genetic and nutritional approaches relevant to each system were drawn that, if implemented, would help shape more sustainable future ruminant livestock systems.

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“…In addition, the deterioration of pasture quality during the summer requires farmers to supplement their animals with grains and silages to maintain growth [ 11 ]. Studies have shown that concentrate supplementation is an effective means to regulate HS [ 12 , 13 ]. However, the presence of highly fermentable grain such as wheat in the concentrate diet can offset the benefit of increasing the concentrate content of the feed [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Reducing the Fermentability of Wheat with a Starch Binding Agent Reduces Some of the Negative Effects of Heat Stress in Sheep

Pragna

Chauhan

Leury

et al. 2022

Animals

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The objective of this study was to investigate the effects of reducing the fermentability of grains on thermoregulatory responses in heat stressed (HS) lambs. To achieve this, wheat grain treated with a commercial starch binding agent, Bioprotect, is compared to maize, which has already demonstrated effects in ameliorating heat stress-induced thermoregulation responses and untreated wheat grains. An initial in vitro experiment was conducted to examine cumulative gas production from the fermentation of wheat grain with different dosages of the commercial starch binding agent, Bioprotect. Based on the in vitro results, an in vivo lamb experiment was conducted using 24 Merino lambs (1 year old; 42.6 ± 3.6 kg BW). The lambs were offered one of three dietary treatments: a wheat-based diet (WD), a Bioprotect treated wheat-based diet (BD), and a maize-based diet (MD). Three successive 1-week experimental periods were conducted with lambs from all dietary groups (P1, P2, and P3). During P1, lambs were exposed to a TN environment and fed a 1.7× Maintenance feed intake (MF) level; in P2, lambs were kept in a HS environment and fed a 1.7× MF level; and in P3, animals were kept in a HS environment and fed a 2× MF level. The in vitro experiment revealed a reduction in cumulative gas production (p < 0.05) from the Bioprotect treated wheat compared to untreated wheat samples. In the in vivo component of the study, the replacement of wheat with maize or 2% Bioprotect-treated wheat reduced the respiration rate (p < 0.001) and heart rate (p ≤ 0.01) of lambs during HS. There was a reduction in the concentration of blood gas variables such as a base excess of blood (BE(b)) and extracellular fluid (BE(ecf)), bicarbonate (cHCO3-), the partial pressure of carbon dioxide (PCO2,), the total concentration of carbon dioxide (ctCO2), and sodium (Na+) (p ≤ 0.001 for all) during the periods of HS compared to the thermoneutral conditions. Moreover, BD- and MD-fed lambs had a higher blood potassium concentration (K+) than the WD-fed lambs (p = 0.008). The results of the present study suggest that Bioprotect can be a viable feed treatment strategy for treating rapidly fermentable grains such as wheat to alleviate the effects of HS. Further, Bioprotect-treated wheat could be an option to replace maize in concentrate rations in jurisdictions where maize is cost-prohibitive or unavailable.

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Nutritional Strategies to Alleviate Heat Stress in Sheep

Cited by 9 publications

References 65 publications

The Importance of Dietary Antioxidants on Oxidative Stress, Meat and Milk Production, and Their Preservative Aspects in Farm Animals: Antioxidant Action, Animal Health, and Product Quality—Invited Review

The Importance of Dietary Antioxidants on Oxidative Stress, Meat and Milk Production, and Their Preservative Aspects in Farm Animals: Antioxidant Action, Animal Health, and Product Quality—Invited Review

Key traits for ruminant livestock across diverse production systems in the context of climate change: perspectives from a global platform of research farms

Reducing the Fermentability of Wheat with a Starch Binding Agent Reduces Some of the Negative Effects of Heat Stress in Sheep

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