# Environment-Associated Variations in Blood Metabolism of Mongolian Cattle Grazing in the Alxa Desert of China

## TL;DR

This study explores how Mongolian cattle adapt to the harsh desert environment by altering their blood metabolism, which could help improve livestock breeding in tough climates.

## Contribution

The study identifies specific metabolic and physiological adaptations in Mongolian cattle to desert conditions, including changes in glucose, amino acids, and energy use.

## Key findings

- Climate significantly affects blood parameters like glucose, creatinine, and alkaline phosphatase in Mongolian cattle.
- Metabolomic profiling reveals reduced TCA cycle and fatty acid metabolism, with increased carbohydrate and amino acid metabolism in arid regions.
- Glucose levels are negatively correlated with body size traits, and amino acids like proline and valine may support physiological stability under stress.

## Abstract

Alxa Mongolian cattle live in desert regions with extreme heat, strong sunlight, and little rainfall. To survive in this harsh environment, they have developed special ways to adapt. In this study, we examined their blood and metabolism and found that changes in glucose, calcium, and amino acids help them cope with heat and dryness. Their body size, hormone levels, and energy use also support survival in the desert. These results help us better understand how animals adapt to climate stress and may help improve livestock breeding in tough environments.

Desert environments pose severe challenges to livestock survival. This study examined climate-driven physiological and metabolic adaptations in 258 Mongolian cattle from six regions of the Alxa Desert, China. Serum biochemical indices were measured and analyzed using linear models to assess the effects of climate, sex, and age. Climate significantly affected key blood parameters, including glucose (p < 0.001), creatinine (p < 0.001), alkaline phosphatase (p < 0.001), and lactate (p = 0.034). Additionally, sex significantly influenced lactate dehydrogenase (p = 0.049), bicarbonate (p = 0.0061), urea (p = 0.0055), and triglycerides (p = 0.039), while age affected total protein (p = 0.020), LDL-C (p = 0.0097), and cholesterol (p < 0.001). Glucose levels were negatively correlated with body size traits. Metabolomic profiling showed that cattle in arid, high-radiation areas exhibited reduced TCA cycle and fatty acid metabolism, with concurrent carbohydrate accumulation, including glucose, fructose, and mannose. Enhanced amino acid metabolism increased proline, valine, tyrosine, and tryptophan levels, potentially supporting physiological stability under heat and drought stress. These findings reveal how Mongolian cattle modulate metabolism in response to desert climates, offering insights into livestock adaptation and informing breeding strategies for resilience in harsh environments.