The effects of rumen-protected tryptophan (RPT) on production performance and relevant hormones of dairy cows

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Zoological Science

Main article text

 

Introduction

Materials and Methods

Animals

Experimental diet and feeding management

Experimental design

Delivery method

Methods of sample collection and determination

Recording of feed intake

Methods of milk samples collection

Dairy herd improvement (DHI) test

Methods of serum samples collection

Statistical analyses

Results

The effects of RPT supplementation on milk yield

The effects of RPT supplementation on milk composition

The effects of RPT supplementation on serum hormone levels in dairy cows

5-HT

MT

PRL

GH

IGF-1

Discussion

Conclusion

Supplemental Information

Author Checklist-Full

DOI: 10.7717/peerj.13831/supp-2

Additional Information and Declarations

Competing Interests

Hui Ma is employed by Beijing Sanyuan Breeding Technology Co., Ltd. Libing Bai and Sarvvl Bai are employed by Beijing Sunlon Livestock Development Co. Ltd. The authors declare there are no competing interests.

Author Contributions

Hui Ma conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the article, and approved the final draft.

Songyang Yao conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the article, and approved the final draft.

Libing Bai analyzed the data, authored or reviewed drafts of the article, and approved the final draft.

Sarvvl Bai performed the experiments, prepared figures and/or tables, and approved the final draft.

Guoshi Liu conceived and designed the experiments, authored or reviewed drafts of the article, and approved the final draft.

Animal Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

China Agricultural University Laboratory Animal Welfare and Animal Experimental Ethical Inspection Committee provided full approval for this research (AW61301202-1-1).

Data Availability

The following information was supplied regarding data availability:

The raw measurements are available in the Supplemental File.

Funding

This research was supported by the Beijing municipal commission of science and technology (NO. Z181100009318014) and the dairy industry system innovation team of Beijing City (No. BAIC06-21). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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