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Published December 15, 2013 | Version v1
Journal article Open

HORMONAL AND METABOLIC PROFILE IN SIMMENTAL DAIRY COWS DURING DRY PERIOD, EARLY AND MID LACTATION

  • 1. University of Kragujevac, Faculty of Agronomy, Čačak, Serbia
  • 2. University of Novi Sad, Faculty of Agriculture, Novi Sad, Serbia

Description

The aim of this study was ti investigate endocrine and metabolic characteristic of Simmental cows in dry period, early and mid lactation. Experiment was included 45 Simental cows: 15 in dry period (2 weeks before calving, period 1), 15 in early lactation (in firs week after calving, period 2) and 15 in mid lactation (4-5 month after calving, period 3). Frequency distribution analysis shows that most of the parameters takes a normal distribution of distribution, unless the value of the total lipids (early lactation), urea (early lactation), T3 (dry period and mid lactation), T4 (early lactation) and insulin (dry period). The moment of blood collection has a
substantial impact on the value of hormones and metabolites, except for total protein, T4 and insulin. Significant F value and posthock LSD were significant for: glucose (F=25.44; LSD 1:2, 1:3, significantly higher concentrations of glucose the dry period), cholesterol (F=15.62; LSD 1:3, 2:3, significantly higher concentrations of cholesterol in the middle of lactation), triglycerides (F= 50.42 ; LSD 1:2, 1:3, significantly higher concentrations in the dry period), total lipids (F =27.89; LSD 1:3 , 2:3, significantly higher
concentration in the middle of lactation), NEFA (F=10.74; LSD 1:2, 1:3, significantly higher concentrations in early lactation ), BHB (F=24.39; LSD 1: 2, 1:3, 2:3, significantly higher concentrations in early lactation), albumin (F=9.2, LSD 1:2, 1:3, significantly higher concentrations in the dry period ), urea (F=11.61; LSD 1:2, 2:3, significantly reduced concentration in early lactation), T3 (F=3.31; LSD 1:3, 2:3, significantly lower concentrations in dry period and early lactation), growth hormone (F=4,17; LSD 1:2, 2:3, higher
concentrations in early lactation). Concentrations of hormones and metabolites in Simmental cows depend on whether the blood was taken during the dry period, early lactation and mid lactation. Differences in metabolite values indicate the existence of reduced food intake, a negative energy balance, the mobilization of lipids and altered functional status of hepatocytes in early lactation. Most of the studied parameters showed a normal frequency distribution. The absence of normal frequency distribution for some parameters, particularly during early lactation, may indicate high heterogeneity of cows in the process of adaptation to the periparturient period.

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