Assessment of thermal status of somatotropin-injected lactating Holstein cows maintained under controlled-laboratory thermoneutral, hot and cold environments

W. Manalu, H. D. Johnson, R. Z. Li, B. A. Becker, Robert J Collier

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Two experiments, with a single-reversal design and 12 cows per experiment, were conducted to study the effects of somatotropin on thermal status of lactating cows under laboratory thermoneutral (18 to 22°C, 30-50% relative humidity), hot (24-35°C, 30-50% relative humidity) and cold (-5-+5°C, 50-55% relative humidity) conditions. Throughout the experiment six cows were injected with somatotropin (25 mg/d) and six with sodium bicarbonate. All injections were started the first day of the 30-d natural environmental period (22-35°C and 41-97% relative humidity for summer experiment, and -5-+5°C and 4-25% relative humidity for winter experiment) before the cows were exposed alternatively to laboratory thermoneutral and hot or cold environments. The somatotropin-treated cows had higher energy intake (13 and 17%), heat production (19 and 25%), heat loss (36 and 24%) and milk energy (40 and 49%), then control cows under thermoneutral and hot conditions, respectively. The somatotropin-treated cows had higher heat production (18 and 10%), respiratory heat loss (27 and 17%) and milk energy (14 and 25%) than control cows under thermoneutral and cold conditions, respectively. The increased heat production associated with somatotropin was accompanied by increased heat losses. Part of the increased heat production was attributed to the increased milk energy and energy intake. These results suggest that increased heat production during somatotropin treatment was within the range that could be dissipated by the cows.

Original languageEnglish (US)
Pages (from-to)2006-2019
Number of pages14
JournalJournal of Nutrition
Volume121
Issue number12
StatePublished - 1991
Externally publishedYes

Fingerprint

Thermogenesis
somatotropin
Growth Hormone
Humidity
Holstein
Hot Temperature
heat
cows
heat production
relative humidity
Milk
Energy Intake
milk
Sodium Bicarbonate
energy intake
energy
sodium bicarbonate
Injections
injection
winter

Keywords

  • Bovine somatotropin
  • Cows
  • Heat loss
  • Heat production
  • Thermal stress

ASJC Scopus subject areas

  • Food Science
  • Medicine (miscellaneous)

Cite this

Assessment of thermal status of somatotropin-injected lactating Holstein cows maintained under controlled-laboratory thermoneutral, hot and cold environments. / Manalu, W.; Johnson, H. D.; Li, R. Z.; Becker, B. A.; Collier, Robert J.

In: Journal of Nutrition, Vol. 121, No. 12, 1991, p. 2006-2019.

Research output: Contribution to journalArticle

@article{6da2a8dd606a49b7901a6953bfe6f95d,
title = "Assessment of thermal status of somatotropin-injected lactating Holstein cows maintained under controlled-laboratory thermoneutral, hot and cold environments",
abstract = "Two experiments, with a single-reversal design and 12 cows per experiment, were conducted to study the effects of somatotropin on thermal status of lactating cows under laboratory thermoneutral (18 to 22°C, 30-50{\%} relative humidity), hot (24-35°C, 30-50{\%} relative humidity) and cold (-5-+5°C, 50-55{\%} relative humidity) conditions. Throughout the experiment six cows were injected with somatotropin (25 mg/d) and six with sodium bicarbonate. All injections were started the first day of the 30-d natural environmental period (22-35°C and 41-97{\%} relative humidity for summer experiment, and -5-+5°C and 4-25{\%} relative humidity for winter experiment) before the cows were exposed alternatively to laboratory thermoneutral and hot or cold environments. The somatotropin-treated cows had higher energy intake (13 and 17{\%}), heat production (19 and 25{\%}), heat loss (36 and 24{\%}) and milk energy (40 and 49{\%}), then control cows under thermoneutral and hot conditions, respectively. The somatotropin-treated cows had higher heat production (18 and 10{\%}), respiratory heat loss (27 and 17{\%}) and milk energy (14 and 25{\%}) than control cows under thermoneutral and cold conditions, respectively. The increased heat production associated with somatotropin was accompanied by increased heat losses. Part of the increased heat production was attributed to the increased milk energy and energy intake. These results suggest that increased heat production during somatotropin treatment was within the range that could be dissipated by the cows.",
keywords = "Bovine somatotropin, Cows, Heat loss, Heat production, Thermal stress",
author = "W. Manalu and Johnson, {H. D.} and Li, {R. Z.} and Becker, {B. A.} and Collier, {Robert J}",
year = "1991",
language = "English (US)",
volume = "121",
pages = "2006--2019",
journal = "Journal of Nutrition",
issn = "0022-3166",
publisher = "American Society for Nutrition",
number = "12",

}

TY - JOUR

T1 - Assessment of thermal status of somatotropin-injected lactating Holstein cows maintained under controlled-laboratory thermoneutral, hot and cold environments

AU - Manalu, W.

AU - Johnson, H. D.

AU - Li, R. Z.

AU - Becker, B. A.

AU - Collier, Robert J

PY - 1991

Y1 - 1991

N2 - Two experiments, with a single-reversal design and 12 cows per experiment, were conducted to study the effects of somatotropin on thermal status of lactating cows under laboratory thermoneutral (18 to 22°C, 30-50% relative humidity), hot (24-35°C, 30-50% relative humidity) and cold (-5-+5°C, 50-55% relative humidity) conditions. Throughout the experiment six cows were injected with somatotropin (25 mg/d) and six with sodium bicarbonate. All injections were started the first day of the 30-d natural environmental period (22-35°C and 41-97% relative humidity for summer experiment, and -5-+5°C and 4-25% relative humidity for winter experiment) before the cows were exposed alternatively to laboratory thermoneutral and hot or cold environments. The somatotropin-treated cows had higher energy intake (13 and 17%), heat production (19 and 25%), heat loss (36 and 24%) and milk energy (40 and 49%), then control cows under thermoneutral and hot conditions, respectively. The somatotropin-treated cows had higher heat production (18 and 10%), respiratory heat loss (27 and 17%) and milk energy (14 and 25%) than control cows under thermoneutral and cold conditions, respectively. The increased heat production associated with somatotropin was accompanied by increased heat losses. Part of the increased heat production was attributed to the increased milk energy and energy intake. These results suggest that increased heat production during somatotropin treatment was within the range that could be dissipated by the cows.

AB - Two experiments, with a single-reversal design and 12 cows per experiment, were conducted to study the effects of somatotropin on thermal status of lactating cows under laboratory thermoneutral (18 to 22°C, 30-50% relative humidity), hot (24-35°C, 30-50% relative humidity) and cold (-5-+5°C, 50-55% relative humidity) conditions. Throughout the experiment six cows were injected with somatotropin (25 mg/d) and six with sodium bicarbonate. All injections were started the first day of the 30-d natural environmental period (22-35°C and 41-97% relative humidity for summer experiment, and -5-+5°C and 4-25% relative humidity for winter experiment) before the cows were exposed alternatively to laboratory thermoneutral and hot or cold environments. The somatotropin-treated cows had higher energy intake (13 and 17%), heat production (19 and 25%), heat loss (36 and 24%) and milk energy (40 and 49%), then control cows under thermoneutral and hot conditions, respectively. The somatotropin-treated cows had higher heat production (18 and 10%), respiratory heat loss (27 and 17%) and milk energy (14 and 25%) than control cows under thermoneutral and cold conditions, respectively. The increased heat production associated with somatotropin was accompanied by increased heat losses. Part of the increased heat production was attributed to the increased milk energy and energy intake. These results suggest that increased heat production during somatotropin treatment was within the range that could be dissipated by the cows.

KW - Bovine somatotropin

KW - Cows

KW - Heat loss

KW - Heat production

KW - Thermal stress

UR - http://www.scopus.com/inward/record.url?scp=0026337405&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0026337405&partnerID=8YFLogxK

M3 - Article

VL - 121

SP - 2006

EP - 2019

JO - Journal of Nutrition

JF - Journal of Nutrition

SN - 0022-3166

IS - 12

ER -