Research progress on the application of feed additives in ruminal methane emission reduction: a review

Sun, Kang; Liu, Huihui; Fan, Huiyu; Liu, Ting; Zheng, Chen

doi:10.7717/peerj.11151

Cited by 18 publications

(7 citation statements)

References 126 publications

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“…Yeast products and inulin stimulate the growth of other rumen bacteria competing for hydrogen against methanogens [ 109 ], while chitosan disrupts the cell wall permeability of methanogen causing cell death [ 110 ]. However, their usage in ruminants is still relatively limited compared to other feed additives and requires further research to encourage its adoption [ 111 ].…”

Section: Mitigation Strategiesmentioning

confidence: 99%

Strategies to Mitigate Enteric Methane Emissions from Ruminant Animals

Tseten

Sanjorjo

Kwon

et al. 2022

J. Microbiol. Biotechnol.

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Ruminants are cloven-hoofed mammals of the Artiodactyla order, with domesticated cattle, sheep, and goats comprising 95% of the total ruminant population [14]. They obtain their food by browsing or grazing, subsisting on plant material using their specialized digestive system [15] with a sophisticated symbiotic web of microorganisms [16]. The digestive system of ruminants consists of four compartments -rumen, reticulum, omasum, and abomasum [17].In the rumen, the intricate community of bacteria (10 10 -10 11 cells/ml), ciliate protozoa (10 4 -10 6 cells/ml), methanogenic archaea (10 6 -10 8 cells/ml), and fungi (10 3 -10 6 cells/ml) synthesizes enzymes which breakdown complex macromolecules derived from feed [18,19]. This fermentative process produces short volatile fatty acids (SVFAs) and microbial crude protein, which is an essential source of energy and protein for the host, while the rumen provides the microbes a suitable environment for survival and growth [16,20]. Acetate (~65%), propionate (~20%), and butyrate (~15%) form the major part of SVFAs in the anaerobic rumen fermentation, which supplies 80% of the animal's total energy requirement [21]. Subsequently, methanogens in the gastrointestinal tract produce methane as a by-product of anaerobic fermentation [22].Human activities account for approximately two-thirds of global methane emissions, wherein the livestock sector is the single massive methane emitter. Methane is a potent greenhouse gas of over 21 times the warming effect of carbon dioxide. In the rumen, methanogens produce methane as a by-product of anaerobic fermentation. Methane released from ruminants is considered as a loss of feed energy that could otherwise be used for productivity. Economic progress and growing population will inflate meat and milk product demands, causing elevated methane emissions from this sector. In this review, diverse approaches from feed manipulation to the supplementation of organic and inorganic feed additives and direct-fed microbial in mitigating enteric methane emissions from ruminant livestock are summarized. These approaches directly or indirectly alter the rumen microbial structure thereby reducing rumen methanogenesis. Though many inorganic feed additives have remarkably reduced methane emissions from ruminants, their usage as feed additives remains unappealing because of health and safety concerns. Hence, feed additives sourced from biological materials such as direct-fed microbials have emerged as a promising technique in mitigating enteric methane emissions.

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Section: Mitigation Strategiesmentioning

confidence: 99%

Strategies to Mitigate Enteric Methane Emissions from Ruminant Animals

Tseten

Sanjorjo

Kwon

et al. 2022

J. Microbiol. Biotechnol.

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“…The underlying mechanism may involve the role of CA in bee physiological metabolism and immune function. CA, a natural antioxidant, likely helps reduce oxidative stress levels in bees, slowing cell apoptosis and tissue damage and thereby prolonging lifespan [ 40 , 41 ]. Additionally, CA might influence bee lifespan by modulating their feeding behavior and energy metabolism.…”

Section: Discussionmentioning

confidence: 99%

Consumption of Citric Acid by Bees Promotes the Gland Development and Enhances Royal Jelly Quality

Wang,

Ji,

Zheng

et al. 2024

Life

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The glands of bees are responsible for generating and secreting various biologically active substances that significantly impact bee physiological health and adaptability. This study aimed to investigate the effects of adding citric acid (CA) to bee feed on gland development and royal jelly quality. By formulating feed with varying proportions of CA, evaluation was undertaken of pollen feeding by honeybees under laboratory conditions, along with the impact of CA on the development of major glands, to determine suitable addition proportions. Further optimization of the CA proportion involved feeding colonies and evaluating royal jelly production and quality. The results indicated that feed containing 0.75% CA significantly extended the lifespan of bees and increased their pollen consumption. Gland development in bees showed a positive correlation with CA addition within the range of 0.25% to 0.75%, especially at 0.50% and 0.75%, which notably accelerated the development of mandibular, hypopharyngeal, and cephalic salivary glands, with active proliferation and differentiation of glandular cells and maintenance of normal gland size and morphology. CA added to feed stimulated vigorous secretion of wax glands in worker bees, resulting in prolific wax construction. Colonies consuming feed containing 0.50% CA produced royal jelly with significantly reduced moisture and total sugar content and increased levels of 10-HDA, total phenolic acids, total proteins, and acidity. These findings demonstrate that CA consumption significantly prolongs bee lifespan, increases consumption, promotes gland development, and enhances royal jelly quality. This research provides theoretical guidance for beekeeping practices and feed development, contributing to the sustainable advancement of apiculture.

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“…Los productos de levadura y la inulina estimulan el crecimiento de otras mientras que el quitosano interrumpe la permeabilidad de la pared celular de los metanógenos causando la muerte de las células (Seankamsorn et al, 2020). Sin embargo, su uso en rumiantes es todavía relativamente limitado en comparación con otros aditivos para piensos por lo cual se requiere más investigación para fomentar su adopción (Sun et al, 2021).…”

Section: Aditivos Orgánicos Adicionalesunclassified