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Age at first calving and productive performance of primiparous Holsteins

This study investigated the age at first calving in Holstein heifers and its impact on various production parameters. A sample of 737 Holstein heifers born between 2015 and 2018 and finishing their first lactations between 2018 and 2020 was included. Cluster analysis revealed three groups based on a...

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Bibliographic Details
Published in:Journal of dairy research 2023-11, Vol.90 (4), p.353-356
Main Authors: Braganholo, Rafael Ceolim, Bánkuti, Ferenc Istvan, dos Santos, Fabio Seiji, Pedrosa, Victor Breno, Zambom, Maximiliane Alavarse, Valloto, Altair Antônio, dos Santos, Geraldo Tadeu
Format: Article
Language:English
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Summary:This study investigated the age at first calving in Holstein heifers and its impact on various production parameters. A sample of 737 Holstein heifers born between 2015 and 2018 and finishing their first lactations between 2018 and 2020 was included. Cluster analysis revealed three groups based on age at first calving: high precocity, medium precocity and low precocity. Medium-precocity group exhibited the highest 305-day milk yield and peak milk production. Additionally, the same group demonstrated superior mean production per lactation, 305-day milk protein content, and 305-day milk yield. The lowest somatic cell count was found in the low-precocity group. In conclusion, medium-precocity cows showed better results such as higher 305-day milk yield and peak milk production.
ISSN:0022-0299
1469-7629
DOI:10.1017/S0022029923000729