What question did this study set out to answer?

To determine how arterial infusions of insulin, amino acids, and their combination affect mammary blood flow and amino acid uptake in lactating dairy cows.

October 1, 1991Journal of Dairy ScienceOpen Access

The Influence of Insulin and Amino Acid Supply on Amino Acid Uptake by the Lactating Bovine Mammary Gland

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Authors

JMJ.A. MetcalfCanadian Nutrition Society JSJohn SuttonUniversity of Stirling JCJ. E. CockburnAberystwyth University

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Implication

Latin square crossover trial demonstrates that combined insulin and amino acid infusions increase mammary blood flow in lactating dairy cows, suggesting coordinate regulation of nutrient uptake.

Key Points

To determine how arterial infusions of insulin, amino acids, and their combination affect mammary blood flow and amino acid uptake in lactating dairy cows.
Infused four lactating dairy cows in a 4 x 4 Latin square design over 3-day periods with insulin (1.41 U/h), an amino acid mixture (threonine, methionine, leucine, phenylalanine, lysine), or both into bilateral extra pudic arteries.
Measured mammary blood flow using p-amino-hippuric acid dye dilution and determined nutrient uptake from simultaneous downstream arterial and subcutaneous abdominal venous blood sampling.
Combined arterial infusion of insulin and amino acids increased mammary blood flow by 37% (P < .05).
Infusion of amino acids increased the arteriovenous difference and uptake of the infused amino acids (P < .05 for phenylalanine), while insulin infusion alone tended to reduce uptake.
Infusions caused no significant differences in total milk yield or milk composition.

Cite This Study

Metcalf et al. (1991) studied this question.

synapsesocial.com/papers/6a72ff389cd4de638c9a3115 https://doi.org/10.3168/jds.s0022-0302(91)78531-7

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Implication

Latin square crossover trial demonstrates that combined insulin and amino acid infusions increase mammary blood flow in lactating dairy cows, suggesting coordinate regulation of nutrient uptake.

The Influence of Insulin and Amino Acid Supply on Amino Acid Uptake by the Lactating Bovine Mammary Gland

Discussion

Member takes

Implication

Key Points

Cite This Study

The Influence of Insulin and Amino Acid Supply on Amino Acid Uptake by the Lactating Bovine Mammary Gland

Discussion

Member takes

Implication

Key Points

Cite This Study

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