Serum metabolome of Yak

This study examined the effects of nutritional interventions on the milk composition and blood metabolic profiles in postpartum yaks. Twenty yaks, of similar parity and body condition, were randomly assigned to two groups: a control group, which grazed freely, and a treatment group, which received 3.0 kg of oat hay and 1.0 kg of concentrate feed daily in addition to free grazing. The trial lasted 81 days, covering the period from 21 days before calving to 60 days post-calving. Milk samples were collected weekly for analysis of nutrients, amino acids, and fatty acids, while blood samples were taken at 15, 30, and 60 days postpartum for serum metabolomics analysis.