What question did this study set out to answer?

To evaluate the impact of residual feed intake (RFI) on the reproductive competence of Hays Converter heifers.

Residual feed intake does not seem to affect reproductive competence of Hays Converter heifers

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To evaluate the impact of residual feed intake (RFI) on the reproductive competence of Hays Converter heifers.
Classified heifers into low-RFI, medium-RFI, and high-RFI groups
Monitored rumen temperature using an automated smart rumen bolus system
Assessed reproductive status through follicle count, ovulation occurrence, and uterine horn measurement
No differences in body weight, average daily gain, or feed conversion ratio across RFI groups
High-RFI heifers had elevated rumen temperatures compared to more efficient groups
Follicle counts varied significantly over days but reproductive traits did not differ by RFI

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The study evaluates how residual feed intake affects reproductive competence in heifers, suggesting no significant impact.

Silva et al. (2026) studied this question.

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