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Maternal protein reserves and their influence on lactational performance in rats
A P Pine1, N S Jessop, J D Oldham
1Institute of Ecology and Resource Management, University of Edinburgh.
The British Journal of Nutrition
|January 1, 1994
Summary
Maternal protein reserves do not impact lactational performance if adequate dietary protein is supplied during lactation. Rats fed low protein diets during gestation and lactation showed reduced performance, but adequate dietary protein during lactation restored performance.
Area of Science:
- Animal Nutrition
- Reproductive Physiology
- Maternal-Fetal Nutrition
Background:
- Tissue protein reserves are crucial for physiological functions, including reproduction and lactation.
- Understanding the interplay between maternal protein status and lactational capacity is vital for optimizing animal health and productivity.
Purpose of the Study:
- To investigate the role of maternal tissue protein reserves in supporting lactational performance in Sprague-Dawley rats.
- To determine if prior protein depletion affects the ability to sustain lactation when dietary protein is adequate.
Main Methods:
- Female rats were fed high (H) or low (L) protein diets during gestation, creating differential carcass protein levels at parturition.
- Lactating rats were then assigned to high (H) or low (L2) protein diets, resulting in four treatment groups (HH, HL2, LH, LL2).
- Carcass and organ analyses were performed, and litter weight gain served as the primary measure of lactational performance.
Main Results:
- Maternal carcass protein content at parturition was significantly higher in rats fed a high-protein diet during gestation.
- During lactation, rats fed adequate dietary protein (HH and LH) maintained or replenished carcass protein without differing lactational performance.
- Rats fed low-protein diets during lactation (HL2 and LL2) lost carcass protein, with HL2 rats exhibiting greater loss but also higher intake and performance than LL2 rats.
- Lactational performance was compromised by low dietary protein during lactation, but not by prior maternal protein depletion if dietary protein was sufficient.
Conclusions:
- Adequate dietary protein during lactation is the primary determinant of lactational performance, overriding the influence of pre-gestational or gestational protein status.
- Maternal rats can mobilize tissue protein reserves to support lactation, but this is less efficient than adequate dietary intake.
- The ability to increase food intake and catabolize protein allows for greater lactational performance even with depleted reserves, provided sufficient dietary protein is available.