Effect of foetal number and sex on maternal thyroid and lipidic profiles in dairy goats
2022
Liotta, Luigi | Bionda, Arianna | Medica, Pietro | De Nardo, Floro | Visalli, Rosanna | Fazio, Esterina
The study aimed to evaluate the effects of the kids’ number and sex on the thyroid and lipidic patterns of 30 dairy goats in the advanced mid-gestation and from 30 to 105 days of lactation. Blood samples were monthly collected to measure circulating thyroid stimulating hormone (TSH), total and free triiodothyronines (T₃, fT₃) and thyroxines (T₄, fT₄); triglyceride (TG), total cholesterol (tCho), and very-low-density lipoprotein cholesterol (VLDL Cho). Dams carrying a single foetus showed higher T₄ concentrations (P < 0.04) at >130–150 days than those carrying twins. Dams carrying one/two males had the highest fT₃ (P < 0.001) and fT₄ (P < 0.03) concentrations at 95–115 days and the highest fT₃ (P < 0.0001) and TSH (P < 0.002) at >115–130 days. Dams kidding male and female twins showed the highest TG and VLDL Cho concentrations (P < 0.04) at >70–105 days of lactation. Single or twin births influenced the thyroid activity of pregnant goats, with a specific effect of foetal number on T₄ and of foetal sex on fT₃ and fT₄ concentrations. Kids’ number and sex affected TG and VLDL Cho in lactating dams. This suggests that foetal number and sex are not a random chance event but an interactive process between maternal and foetal endocrine and metabolic processes.
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