September 1, 2024Journal of Animal Science

506 Residual feed intake and thermotolerance in grazing lactating first-calf beef heifers: Effects on metabolism, performance, rumen temperature, and activity behavior

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Enhanced thermotolerance occurred in efficient beef heifers with low residual feed intake, which maintained lower rumen temperature and rested more during peak summer heat hours.
Rumen temperature was significantly greater (P = 0.02) in high residual feed intake heifers, while plasma non-esterified fatty acids varied across study days.
A completely randomized design evaluated 35 grazing lactating beef heifers over a 64-d summer pasture trial, analyzing blood urea nitrogen and daily ruminal heat.

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Implication

Randomized trial reveals divergent thermotolerance and activity patterns in grazing lactating beef heifers, highlighting physiological advantages of residual feed intake selection during summer.

Cite This Study

Londoño-Méndez et al. (2024) studied this question.

synapsesocial.com/papers/68e59fa7b6db64358753a03d https://doi.org/10.1093/jas/skae234.171

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Implication

Randomized trial reveals divergent thermotolerance and activity patterns in grazing lactating beef heifers, highlighting physiological advantages of residual feed intake selection during summer.

506 Residual feed intake and thermotolerance in grazing lactating first-calf beef heifers: Effects on metabolism, performance, rumen temperature, and activity behavior

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Discussion

Implication

Cite This Study

506 Residual feed intake and thermotolerance in grazing lactating first-calf beef heifers: Effects on metabolism, performance, rumen temperature, and activity behavior

Key Points

Discussion

Implication

Cite This Study

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