Field Trial on Glucose-Induced Insulin Response in High-Yielding Dairy Cows under Different Environmental Temperatures

This study aimed to evaluate glucose-induced insulin response in cows exposed to different temperature-humidity index. Twenty early lactating Holstein-Friesian cows were divided into 2 equal groups based on season, as summer (SU) and spring (SP). SP cows were not exposed to heat stress, while SU cow...

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Autores principales:	Vujanac Ivan, Prodanović Radiša, Korićanac Goran, Bojkovski Jovan, Simeunović Predrag, Palamarević Milija, Nedić Sreten, Celeska Irena, Kirovski Danijela
Formato:	article
Lenguaje:	EN
Publicado:	Sciendo 2017
Materias:	dairy cows heat stress intravenous glucose tolerance test homa Veterinary medicine SF600-1100
Acceso en línea:	https://doaj.org/article/c925ad92f5b64d82a96e121ff73acbc1
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spelling	oai:doaj.org-article:c925ad92f5b64d82a96e121ff73acbc12021-11-17T21:27:51ZField Trial on Glucose-Induced Insulin Response in High-Yielding Dairy Cows under Different Environmental Temperatures1820-744810.1515/acve-2017-0030https://doaj.org/article/c925ad92f5b64d82a96e121ff73acbc12017-09-01T00:00:00Zhttps://doi.org/10.1515/acve-2017-0030https://doaj.org/toc/1820-7448This study aimed to evaluate glucose-induced insulin response in cows exposed to different temperature-humidity index. Twenty early lactating Holstein-Friesian cows were divided into 2 equal groups based on season, as summer (SU) and spring (SP). SP cows were not exposed to heat stress, while SU cows were exposed to moderate or severe heat stress. Milk production was recorded daily. Starting from day 30 of lactation, intravenous glucose tolerance test (IVGTT) was carried out three times at 30-day intervals. Blood samples were taken before (basal) and after glucose infusion, and glucose and insulin were measured at each sample point. The homeostatic model assessment (HOMA) index was calculated. Milk yield from days 30 to 40 and 64 to 90 of lactation were higher in SP cows than in SU cows. Basal glucose did not differ on days 30 and 60 of lactation, while basal insulin and HOMA were lower in SU compared to SP cows. On day 90 of lactation, SU cows had higher basal glucose, whereas basal insulin and HOMA did not differ. IVGTT results revealed that glucose tolerance was affected by heat stress such that SU cows had higher glucose clearance. Insulin responses to IVGTT did not differ on days 30 and 60 of lactation. Heat stress had a marked effect on insulin secretion on day 90 of lactation, illustrated by higher increments, peak concentrations and area under the curve for insulin in SU cows. Overall, season differences in glucose tolerance depend not only on heat stress and milk production but also on the stage of lactation.Vujanac IvanProdanović RadišaKorićanac GoranBojkovski JovanSimeunović PredragPalamarević MilijaNedić SretenCeleska IrenaKirovski DanijelaSciendoarticledairy cowsheat stressintravenous glucose tolerance testhomaVeterinary medicineSF600-1100ENActa Veterinaria, Vol 67, Iss 3, Pp 366-382 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	dairy cows heat stress intravenous glucose tolerance test homa Veterinary medicine SF600-1100
spellingShingle	dairy cows heat stress intravenous glucose tolerance test homa Veterinary medicine SF600-1100 Vujanac Ivan Prodanović Radiša Korićanac Goran Bojkovski Jovan Simeunović Predrag Palamarević Milija Nedić Sreten Celeska Irena Kirovski Danijela Field Trial on Glucose-Induced Insulin Response in High-Yielding Dairy Cows under Different Environmental Temperatures
description	This study aimed to evaluate glucose-induced insulin response in cows exposed to different temperature-humidity index. Twenty early lactating Holstein-Friesian cows were divided into 2 equal groups based on season, as summer (SU) and spring (SP). SP cows were not exposed to heat stress, while SU cows were exposed to moderate or severe heat stress. Milk production was recorded daily. Starting from day 30 of lactation, intravenous glucose tolerance test (IVGTT) was carried out three times at 30-day intervals. Blood samples were taken before (basal) and after glucose infusion, and glucose and insulin were measured at each sample point. The homeostatic model assessment (HOMA) index was calculated. Milk yield from days 30 to 40 and 64 to 90 of lactation were higher in SP cows than in SU cows. Basal glucose did not differ on days 30 and 60 of lactation, while basal insulin and HOMA were lower in SU compared to SP cows. On day 90 of lactation, SU cows had higher basal glucose, whereas basal insulin and HOMA did not differ. IVGTT results revealed that glucose tolerance was affected by heat stress such that SU cows had higher glucose clearance. Insulin responses to IVGTT did not differ on days 30 and 60 of lactation. Heat stress had a marked effect on insulin secretion on day 90 of lactation, illustrated by higher increments, peak concentrations and area under the curve for insulin in SU cows. Overall, season differences in glucose tolerance depend not only on heat stress and milk production but also on the stage of lactation.
format	article
author	Vujanac Ivan Prodanović Radiša Korićanac Goran Bojkovski Jovan Simeunović Predrag Palamarević Milija Nedić Sreten Celeska Irena Kirovski Danijela
author_facet	Vujanac Ivan Prodanović Radiša Korićanac Goran Bojkovski Jovan Simeunović Predrag Palamarević Milija Nedić Sreten Celeska Irena Kirovski Danijela
author_sort	Vujanac Ivan
title	Field Trial on Glucose-Induced Insulin Response in High-Yielding Dairy Cows under Different Environmental Temperatures
title_short	Field Trial on Glucose-Induced Insulin Response in High-Yielding Dairy Cows under Different Environmental Temperatures
title_full	Field Trial on Glucose-Induced Insulin Response in High-Yielding Dairy Cows under Different Environmental Temperatures
title_fullStr	Field Trial on Glucose-Induced Insulin Response in High-Yielding Dairy Cows under Different Environmental Temperatures
title_full_unstemmed	Field Trial on Glucose-Induced Insulin Response in High-Yielding Dairy Cows under Different Environmental Temperatures
title_sort	field trial on glucose-induced insulin response in high-yielding dairy cows under different environmental temperatures
publisher	Sciendo
publishDate	2017
url	https://doaj.org/article/c925ad92f5b64d82a96e121ff73acbc1
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Field Trial on Glucose-Induced Insulin Response in High-Yielding Dairy Cows under Different Environmental Temperatures

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