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Some metabolic effects on lactating rats of a low-energy diet restricted in good-quality protein

Adult female Sprague-Dawley rats were fed ad libitum during pregnancy and lactation a control diet (CD; 16.1 kJ/g) or a low-energy diet with wheat gluten as the main protein source (LED; 13.3 kJ/g). Body weight, food intake, resting energy expenditure, respiratory quotient and substrate use by the m... Full description

Journal Title: British journal of nutrition 2006, Vol.96(4), pp.667-673
Main Author: Rosario Ayala , M. Del
Other Authors: Racotta , R. , Hernández-Montes , H. , Quevedo , L.
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0007-1145
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recordid: faoagrisUS201300773674
title: Some metabolic effects on lactating rats of a low-energy diet restricted in good-quality protein
format: Article
creator:
  • Rosario Ayala , M. Del
  • Racotta , R.
  • Hernández-Montes , H.
  • Quevedo , L.
subjects:
  • Body Fat
  • Lactation
  • 3-Hydroxybutyric Acid
  • Blood Glucose
  • Respiratory Quotient
  • Feed Intake
  • Animal Models
  • Females
  • Low Calorie Diet
  • Wheat Gluten
  • Restricted Feeding
  • Mammary Glands
  • Lactic Acid
  • Energy Intake
  • Feed Rations
  • Litter Weight
  • Low Protein Diet
  • Blood Chemistry
  • Rats
  • Body Weight
  • Triacylglycerols
  • Resting Energy Expenditure
  • Dietary Protein
ispartof: British journal of nutrition, 2006, Vol.96(4), pp.667-673
description: Adult female Sprague-Dawley rats were fed ad libitum during pregnancy and lactation a control diet (CD; 16.1 kJ/g) or a low-energy diet with wheat gluten as the main protein source (LED; 13.3 kJ/g). Body weight, food intake, resting energy expenditure, respiratory quotient and substrate use by the mammary gland were measured. After the animals had been killed, the parametrial and retroperitoneal fat pads were weighed. The mean food intake (g) of the two groups of rats was similar, resulting in a lower energy intake by the LED rats, significantly different during the last 2 weeks of lactation. The mean body weight of both dams and pups in the LED group was lower, starting at day 9 of lactation. The resting energy expenditure increased gradually during lactation in the control group, whereas this increase was not seen in rats of the LED group in the last week of lactation. Rats that had fasted overnight had a respiratory quotient of 0.7 or less, whereas for rats that had been fed, the mean respiratory quotient was over 1.0. Under both conditions, rats showed ketonuria. The arteriovenous difference in 3-hydroxybutyrate level was higher and those for glucose, lactate and triacylglycerol were lower across the mammary glands of LED rats. The parametrial fat depot weighed less in LED rats. Reducing the increase in resting energy expenditure and using ketone bodies to a greater extent as fuels may represent important mechanisms in the LED dams to cover the energy cost of milk production. ; Includes references ; p. 667-673.
language: eng
source:
identifier: ISSN: 0007-1145
fulltext: fulltext
issn:
  • 00071145
  • 0007-1145
url: Link


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titleSome metabolic effects on lactating rats of a low-energy diet restricted in good-quality protein
creatorRosario Ayala , M. Del ; Racotta , R. ; Hernández-Montes , H. ; Quevedo , L.
ispartofBritish journal of nutrition, 2006, Vol.96(4), pp.667-673
identifierISSN: 0007-1145
subjectBody Fat ; Lactation ; 3-Hydroxybutyric Acid ; Blood Glucose ; Respiratory Quotient ; Feed Intake ; Animal Models ; Females ; Low Calorie Diet ; Wheat Gluten ; Restricted Feeding ; Mammary Glands ; Lactic Acid ; Energy Intake ; Feed Rations ; Litter Weight ; Low Protein Diet ; Blood Chemistry ; Rats ; Body Weight ; Triacylglycerols ; Resting Energy Expenditure ; Dietary Protein
descriptionAdult female Sprague-Dawley rats were fed ad libitum during pregnancy and lactation a control diet (CD; 16.1 kJ/g) or a low-energy diet with wheat gluten as the main protein source (LED; 13.3 kJ/g). Body weight, food intake, resting energy expenditure, respiratory quotient and substrate use by the mammary gland were measured. After the animals had been killed, the parametrial and retroperitoneal fat pads were weighed. The mean food intake (g) of the two groups of rats was similar, resulting in a lower energy intake by the LED rats, significantly different during the last 2 weeks of lactation. The mean body weight of both dams and pups in the LED group was lower, starting at day 9 of lactation. The resting energy expenditure increased gradually during lactation in the control group, whereas this increase was not seen in rats of the LED group in the last week of lactation. Rats that had fasted overnight had a respiratory quotient of 0.7 or less, whereas for rats that had been fed, the mean respiratory quotient was over 1.0. Under both conditions, rats showed ketonuria. The arteriovenous difference in 3-hydroxybutyrate level was higher and those for glucose, lactate and triacylglycerol were lower across the mammary glands of LED rats. The parametrial fat depot weighed less in LED rats. Reducing the increase in resting energy expenditure and using ketone bodies to a greater extent as fuels may represent important mechanisms in the LED dams to cover the energy cost of milk production. ; Includes references ; p. 667-673.
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titleSome metabolic effects on lactating rats of a low-energy diet restricted in good-quality protein
descriptionAdult female Sprague-Dawley rats were fed ad libitum during pregnancy and lactation a control diet (CD; 16.1 kJ/g) or a low-energy diet with wheat gluten as the main protein source (LED; 13.3 kJ/g). Body weight, food intake, resting energy expenditure, respiratory quotient and substrate use by the mammary gland were measured. After the animals had been killed, the parametrial and retroperitoneal fat pads were weighed. The mean food intake (g) of the two groups of rats was similar, resulting in a lower energy intake by the LED rats, significantly different during the last 2 weeks of lactation. The mean body weight of both dams and pups in the LED group was lower, starting at day 9 of lactation. The resting energy expenditure increased gradually during lactation in the control group, whereas this increase was not seen in rats of the LED group in the last week of lactation. Rats that had fasted overnight had a respiratory quotient of 0.7 or less, whereas for rats that had been fed, the mean respiratory quotient was over 1.0. Under both conditions, rats showed ketonuria. The arteriovenous difference in 3-hydroxybutyrate level was higher and those for glucose, lactate and triacylglycerol were lower across the mammary glands of LED rats. The parametrial fat depot weighed less in LED rats. Reducing the increase in resting energy expenditure and using ketone bodies to a greater extent as fuels may represent important mechanisms in the LED dams to cover the energy cost of milk production. ; Includes references ; p. 667-673.
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abstractAdult female Sprague-Dawley rats were fed ad libitum during pregnancy and lactation a control diet (CD; 16.1 kJ/g) or a low-energy diet with wheat gluten as the main protein source (LED; 13.3 kJ/g). Body weight, food intake, resting energy expenditure, respiratory quotient and substrate use by the mammary gland were measured. After the animals had been killed, the parametrial and retroperitoneal fat pads were weighed. The mean food intake (g) of the two groups of rats was similar, resulting in a lower energy intake by the LED rats, significantly different during the last 2 weeks of lactation. The mean body weight of both dams and pups in the LED group was lower, starting at day 9 of lactation. The resting energy expenditure increased gradually during lactation in the control group, whereas this increase was not seen in rats of the LED group in the last week of lactation. Rats that had fasted overnight had a respiratory quotient of 0.7 or less, whereas for rats that had been fed, the mean respiratory quotient was over 1.0. Under both conditions, rats showed ketonuria. The arteriovenous difference in 3-hydroxybutyrate level was higher and those for glucose, lactate and triacylglycerol were lower across the mammary glands of LED rats. The parametrial fat depot weighed less in LED rats. Reducing the increase in resting energy expenditure and using ketone bodies to a greater extent as fuels may represent important mechanisms in the LED dams to cover the energy cost of milk production.
doi10.1079/BJN20061873
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