English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The objective of this study was to examine the effect of dietary energy  supplementation on hormones that are considered to be the main signals of a  shift in energy balance around parturition. Sixty dry cows, 15 days before  calving, were chosen and divided into two eaqual groups: control and  experimental (GLY). Both groups were fed a standard ration balanced in  accordance to the stage of the productivereproductive cycle. Additionally,  each cow in the GLY group was given glycerol based dietary energy  supplementation (250 mL daily during the dry and 300 mL daily during the  lactation period), which provided additional 9.30 MJ NEL during the dry and  13.95 MJ NEL during the early lactation period. Milk production was measured  on days 30 and 60 of lactation and milk production was significantly higher  in GLY compared to control group at day 60 of lactation (p&lt;0.05). Service  period and insemination index were used as reproductive outcome parameters.  Average service period in the control group was significantly longer than in  the GLY group (p&lt;0.05). Average insemination index in the control group was  not significantly different than the index obtained for the GLY group. Blood  samples were taken before the begining of the experiment (15 days before  parturition), and at days 7, 30 and 60 of lactation. Concentrations of  thyroid hormones, IGF-I, relative abundance of IGFBP-2, IGFBP-3 and IGFBP-4,  concentrations of total protein and albumin in the blood were measured.  Results showed that at days 7 and 30 after parturition, T4 concentrations  were significantly higher (p&lt;0.001, respectively) in GLY than in the control  group, while T3 concentrations were significantly higher in GLY group only  at day 7 after parturition (p&lt;0.001). IGF-I concentrations and IGFBP-3  abundance were significantly higher in the GLY compared to the control group  in all three examined postpartum periods. IGFBP-2 and IGFBP-4 concentrations  were higher in GLY compared to the control group in all three examined  postpartum periods, but the difference was significant only on day 60 after  parturition (p&lt;0.01, respectively). Concentrations of total protein and  albumin were significantly higher in GLY compared to the control group in  all three examined periods after parturition. Based on these results it can  be concluded that peripartum dietary energy supplementation prevent cows'  exposure to severe negative energy balance, preserves synthetic activity of  hepatocytes and consequently has a positive impact on milk production and  reproductive performances in dairy cows

acta veterinaria

Effect of peripartum dietary energy supplementation on thyroid hormones, insulin-like growth factor-i and its binding proteins in early lactation dairy cows