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Nutritional implications of somatotropin for lactating cows
1Center for Animal Health and Productivity, School of Veterinary Medicine, University of Pennsylvania, Kennett Square 19348.
Journal of Dairy Science
|October 1, 1989
Summary
Supplementing cows with somatotropin enhances milk production and lactation persistence, similar to genetically superior animals. Proper feeding strategies are crucial for managing increased nutrient demands and optimizing income over feed costs.
Area of Science:
- Animal Science
- Dairy Nutrition
- Reproductive Physiology
Background:
- Bovine somatotropin (BST) influences milk production.
- Understanding BST's effects on dairy cows is vital for optimizing herd management and profitability.
Purpose of the Study:
- To evaluate the impact of somatotropin supplementation on milk yield, feed intake, physiology, health, and reproduction in dairy cows.
- To assess the effects of somatotropin on lactation curves, milk composition, and nutrient partitioning.
Main Methods:
- Supplementation of dairy cows with somatotropin.
- Monitoring milk yield, feed intake, body condition, and reproductive parameters.
- Analyzing milk composition and ration digestibility.
Main Results:
- Somatotropin supplementation increased milk yield and lactation persistence across various breeds and parities.
- Nutrient partitioning shifted towards milk synthesis, initially utilizing body reserves, followed by increased feed intake.
- Milk composition, ration digestibility, and maintenance requirements remained unaffected.
- Increased milk production necessitates feeding strategies for high-producing cows, including energy-dense rations with buffers and balanced protein.
Conclusions:
- Somatotropin effectively enhances milk production and lactation performance in dairy cows.
- Strategic nutritional management is essential to support cows supplemented with somatotropin.
- Despite higher feed costs, somatotropin supplementation can lead to greater income over feed costs when managed appropriately.
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