Effect of supplemental dietary slow‐release urea on growth performance and physiological status of dairy heifers

Zhang, Jiaojiao; Qiu, Qiang; Shang, Zhanhuan; Liu, Shujie; Degen, A. Allan; Li, Shanshan; Qi, Yan; Wang, Weiwei; Jing, Xiaoping; Bai, Yanfu; Ding, Luming

doi:10.1111/asj.13010

Cited by 2 publications

(2 citation statements)

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“…VFAs are feed fermentation products in the rumen and are the main energy source for ruminants, supplying approximately 75–80% of the ruminant's requirements 28 . In the current study, ruminal concentrations of acetate and propionate in the ARE 80 calves were higher than in the other three groups.…”

Section: Discussionmentioning

confidence: 39%

Astragalus root extract improved average daily gain, immunity, antioxidant status and ruminal microbiota of early weaned yak calves

et al. 2020

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BACKGROUND Early weaning in yak calves is being attempted to improve yak reproduction rate. However, this has to be done with caution because of the high mortality rate of calves due to the lack of nutrients and the harsh environmental conditions. Twenty‐four weaned male yak calves were used in a 60 day feeding trial in which astragalus root extract (ARE) was supplemented. They were assigned randomly to one of four dietary treatments (n = six per treatment) that differed in ARE level: 0 g kg−1 (control), ARE0; 20 g kg−1, ARE20; 50 g kg−1, ARE50; and 80 g kg−1 dry matter intake (DMI), ARE80. RESULTS Final bodyweight and average daily gain (ADG) were significantly higher and the DMI/ADG ratio was significantly lower in calves with ARE supplementation than control (ARE0) calves. Ruminal concentrations of acetate and propionate and serum concentration of superoxide dismutase in ARE80 calves were higher than in the other groups and serum concentration of insulin was higher in ARE80 calves than in ARE20 calves. Serum immunoglobulin G (IgG) and interleukin‐2 (IL‐2) concentrations in ARE‐fed calves were higher than in controls. Serum tumor necrosis factor (TNF‐α) concentration was higher in ARE50 and ARE80 groups than ARE0 calves and serum interleukin‐6 (IL‐6) concentration was higher in ARE80 than in ARE0 calves. Serum immunoglobulin A (IgA), IgG and immunoglobulin M (IgM) concentrations increased with age in ARE‐fed calves. ARE supplementation increased the abundance of fiber degrading bacteria. CONCLUSION ARE at a dosage of 5% to 8% DMI can be supplemented to early weaned yak calves to improve growth performance, antioxidant capacity and immunity. © 2020 Society of Chemical Industry

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Section: Discussionmentioning

confidence: 39%

Astragalus root extract improved average daily gain, immunity, antioxidant status and ruminal microbiota of early weaned yak calves

et al. 2020

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“…Blood biochemical indices in animals indicate their health ( 42 ), nutritional levels, and metabolic functions ( 43 ). Total protein in plasma, composed of albumin and globulin, transports nutrients, maintains colloid osmotic pressure, and regulates immunity ( 44 ).…”

Section: Discussionmentioning

confidence: 99%

Dietary 5-hydroxytryptophan improves sheep growth performance by enhancing ruminal functions, antioxidant capacity, and tryptophan metabolism: in vitro and in vivo studies

Sun,

Aschalew,

Cheng

et al. 2024

Front. Immunol.

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BackgroundHydroxytryptophan (5-HTP) can regulate the synthesis of 5-Hydroxytryptamine (5-HT) and melatonin (MT). In a previous metabolome analysis, we found that 5-HTP is an effective ingredient in yeast culture for regulating rumen fermentation. However, research on the effect of this microbial product (5-HTP) as a functional feed additive in sheep production is still not well explained. Therefore, this study examined the effects of 5-HTP on sheep rumen function and growth performance using in vitro and in vivo models.MethodsA two-factor in vitro experiment involving different 5-HTP doses and fermentation times was conducted. Then, in the in vivo experiment, 10 sheep were divided into a control group which was fed a basal diet, and a 5-HTP group supplemented with 8 mg/kg 5-HTP for 60 days.ResultsThe results showed that 5-HTP supplementation had a significant effect on in vitro DMD, pH, NH3-N, acetic acid, propionic acid, and TVFA concentrations. 5-HTP altered rumen bacteria composition and diversity indices including Chao1, Shannon, and Simpson. Moreover, the in vivo study on sheep confirmed that supplementing with 8 mg/kg of 5-HTP improved rumen fermentation efficiency and microbial composition. This led to enhanced sheep growth performance and increased involvement in the tryptophan metabolic pathway, suggesting potential benefits.ConclusionDietary 5-HTP (8 mg/kg DM) improves sheep growth performance by enhancing ruminal functions, antioxidant capacity, and tryptophan metabolism. This study can provide a foundation for the development of 5-HTP as a functional feed additive in ruminants’ production.

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Effect of supplemental dietary slow‐release urea on growth performance and physiological status of dairy heifers

Cited by 2 publications

References 37 publications

Astragalus root extract improved average daily gain, immunity, antioxidant status and ruminal microbiota of early weaned yak calves

Astragalus root extract improved average daily gain, immunity, antioxidant status and ruminal microbiota of early weaned yak calves

Dietary 5-hydroxytryptophan improves sheep growth performance by enhancing ruminal functions, antioxidant capacity, and tryptophan metabolism: in vitro and in vivo studies

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