Adaptive Responses of Thyroid Hormones, Insulin, and Glucose during Pregnancy and Lactation in Dairy Cows.

ABSTRACT: The study examined the effects of different stages of pregnancy and lactation on thyroid, insulin, and glucose responses in dairy cows. In the present study, 30 dairy cows (10 Holstein, 10 Simmental, and 10 Brown) at 30 ± 20 d of lactation were randomly selected and blood samples were collected once every 60 d for one year to measure circulating thyroid stimulating hormone (TSH), total and free triiodothyronines (T₃, fT₃) and thyroxines (T₄, fT₄), insulin, and glucose. Pregnant cows showed higher T₄ (p = 0.010) and insulin (p = 0.046) concentrations at >180 d than at >60-120 d of pregnancy and in nonpregnant cows. Along the lactation phase, circulating T₄ concentrations showed a biphasic trend, decreasing

SUBMITTER: Fazio E 

PROVIDER: S-EPMC9179583 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature